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This chapter explains the function and syntax of the IP addressing commands. For more information about defaults and usage guidelines, see the corresponding chapter of the Cisco IOS IP and IP Routing Command Reference, Release 12.1.
To add a permanent entry in the Address Resolution Protocol (ARP) cache, use the arp global configuration command. To remove an entry from the ARP cache, use the no form of this command.
arp ip-address hardware-address type [alias]
Syntax Description
ip-address IP address in four-part dotted-decimal format corresponding to the local data link address. hardware-address Local data link address (a 48-bit address). type Encapsulation description. For Ethernet interfaces, this is typically the arpa keyword. For Fiber Distributed Data Interface (FDDI) and Token Ring interfaces, this is always snap. alias (Optional) Indicates that the Cisco IOS software should respond to ARP requests as if it were the owner of the specified address.
To control the interface-specific handling of IP address resolution into 48-bit Ethernet, FDDI, and Token Ring hardware addresses, use the arp interface configuration command. To disable an encapsulation type, use the no form of this command.
arp {arpa | probe | snap}
Syntax Description
arpa Standard Ethernet-style ARP (RFC 826). probe HP Probe protocol for IEEE-802.3 networks. snap ARP packets conforming to RFC 1042.
To configure how long an entry remains in the ARP cache, use the arp timeout interface configuration command. To restore the default value, use the no form of this command.
arp timeout seconds
Syntax Description
seconds Time (in seconds) that an entry remains in the ARP cache. A value of zero means that entries are never cleared from the cache.
To delete all dynamic entries from the ARP cache, to clear the fast-switching cache, and to clear the IP route cache, use the clear arp-cache EXEC command.
clear arp-cacheSyntax Description
This command has no arguments or keywords.
To delete entries from the host-name-and-address cache, use the clear host EXEC command.
clear host {name | *}
Syntax Description
name Particular host entry to remove. * Removes all entries.
To clear dynamic Network Address Translation (NAT) translations from the translation table, use the clear ip nat translation EXEC command.
clear ip nat translation {* | [inside global-ip local-ip] [outside local-ip global-ip]}
Syntax Description
* Clears all dynamic translations. inside Clears the inside translations containing the specified global-ip and local-ip addresses. global-ip When used without the arguments protocol, global-port, and local-port, clears a simple translation that also contains the specified local-ip address. When used with the arguments protocol, global-port, and local-port, clears an extended translation. local-ip (Optional) Clears an entry that contains this local IP address and the specified global-ip address. outside Clears the outside translations containing the specified global-ip and local-ip addresses. protocol (Optional) Clears an entry that contains this protocol and the specified global-ip address, local-ip address, global-port, and local-port. global-port (Optional) Clears an entry that contains this global-port and the specified protocol, global-ip address, local-ip address, and local-port. local-port (Optional) Clears an entry that contains this local-port and the specified protocol, global-ip address, local-ip address, and global-port.
To clear all dynamic entries from the Next Hop Resolution Protocol (NHRP) cache, use the clear ip nhrp EXEC command.
clear ip nhrpSyntax Description
This command has no arguments or keywords.
To delete routes from the IP routing table, use the clear ip route EXEC command.
clear ip route {network [mask] | *}
Syntax Description
network Network or subnet address to remove. mask (Optional) Subnet address to remove. * Removes all routing table entries.
Syntax Description
ip-address IP address. mask Mask for the associated IP subnet. secondary (Optional) Specifies that the configured address is a secondary IP address. If this keyword is omitted, the configured address is the primary IP address.
To define a broadcast address for an interface, use the ip broadcast-address interface configuration command. To restore the default IP broadcast address, use the no form of this command.
ip broadcast-address [ip-address]
Syntax Description
ip-address (Optional) IP broadcast address for a network.
To change the time interval that controls when Next Hop Resolution Protocol (NHRP) will set up or tear down a switched virtual circuit (SVC), use the ip cef traffic-statistics global configuration command. To restore the default values, use the no form of this command.
ip cef traffic-statistics [load-interval seconds] [update-rate seconds]
Syntax Description
load-interval seconds (Optional) Length of time (in 30-second increments) during which the average trigger-threshold and teardown-threshold are calculated before an SVC setup or teardown action is taken. (These thresholds are configured in the ip nhrp trigger-svc command.) The load-interval range is 30 seconds to 300 seconds, in 30-second increments. The default value is 30 seconds. update-rate seconds (Optional) Frequency that the port adapter sends the accounting statistics to the RP. When using NHRP in distributed CEF switching mode, this value must be set to 5 seconds. The default value is 10 seconds.
At times the router might receive packets destined for a subnet of a network that has no network default route. To have the Cisco IOS software forward such packets to the best supernet route possible, use the ip classless global configuration command. To disable this feature, use the no form of this command.
ip classlessSyntax Description
This command has no arguments or keywords.
To define a default gateway (router) when IP routing is disabled, use the ip default-gateway global configuration command. To disable this function, use the no form of this command.
ip default-gateway ip-address
Syntax Description
ip-address IP address of the router.
To enable the translation of directed broadcast to physical broadcasts, use the ip directed-broadcast interface configuration command. To disable this function, use the no form of this command.
ip directed-broadcast [access-list-number]
Syntax Description
access-list-number (Optional) Number of the access list. If specified, a broadcast must pass the access list to be forwarded.
To define a list of default domain names to complete unqualified host names, use the ip domain-list global configuration command. To delete a name from a list, use the no form of this command.
ip domain-list name
Syntax Description
name Domain name. Do not include the initial period that separates an unqualified name from the domain name.
To enable the IP Domain Naming System (DNS)-based host name-to-address translation, use the ip domain-lookup global configuration command. To disable the DNS, use the no form of this command.
ip domain-lookupSyntax Description
This command has no arguments or keywords.
To define a default domain name that the Cisco IOS software uses to complete unqualified host names (names without a dotted-decimal domain name), use the ip domain-name global configuration command. To disable use of the DNS, use the no form of this command.
ip domain-name name
Syntax Description
name Default domain name used to complete unqualified host names. Do not include the initial period that separates an unqualified name from the domain name.
To specify which protocols and ports the router forwards when forwarding broadcast packets, use the ip forward-protocol global configuration command. To remove a protocol or port, use the no form of this command.
ip forward-protocol {udp [port] | nd | sdns}
Syntax Description
udp Forward User Datagram Protocol (UDP) datagrams. See the "Defaults" section below for a list of port numbers forwarded by default. port (Optional) Destination port that controls which UDP services are forwarded. nd Forward Network Disk (ND) datagrams. This protocol is used by older diskless Sun workstations. sdns Secure Data Network Service.
To forward any broadcasts including local subnet broadcasts, use the ip forward-protocol any-local-broadcast global configuration command. To disable this type of forwarding, use the no form of this command.
ip forward-protocol any-local-broadcastSyntax Description
This command has no arguments or keywords.
To permit IP broadcasts to be flooded throughout the internetwork in a controlled fashion, use the ip forward-protocol spanning-tree global configuration command. To disable the flooding of IP broadcasts, use the no form of this command.
ip forward-protocol spanning-treeSyntax Description
This command has no arguments or keywords.
To speed up flooding of User Datagram Protocol (UDP) datagrams using the spanning-tree algorithm, use the ip forward-protocol turbo-flood global configuration command. To disable this feature, use the no form of this command.
ip forward-protocol turbo-floodSyntax Description
This command has no arguments or keywords.
To have the Cisco IOS software forward User Datagram Protocol (UDP) broadcasts, including BOOTP, received on an interface, use the ip helper-address interface configuration command. To disable the forwarding of broadcast packets to specific addresses, use the no form of this command.
ip helper-address address
Syntax Description
address Destination broadcast or host address to be used when forwarding UDP broadcasts. There can be more than one helper address per interface.
To define a static host name-to-address mapping in the host cache, use the ip host global configuration command. To remove the name-to-address mapping, use the no form of this command.
ip host name [tcp-port-number] address1 [address2...address8]
Syntax Description
name Name of the host. The first character can be either a letter or a number. If you use a number, the operations you can perform are limited. tcp-port-number (Optional) TCP port number to connect to when using the defined host name in conjunction with an EXEC connect or Telnet command. The default is Telnet (port 23). address1 Associated IP address. address2...address8 (Optional) Additional associated IP address. You can bind up to eight addresses to a host name.
To enter into the host table the host name of an HP host to be used for HP Probe Proxy service, use the ip hp-host global configuration command. To remove a host name, use the no form of this command.
ip hp-host hostname ip-address
Syntax Description
hostname Name of the host. ip-address IP address of the host.
To enable ICMP Router Discovery Protocol (IRDP) processing on an interface, use the ip irdp interface configuration command. To disable IRDP routing, use the no form of this command.
ip irdp [multicast | holdtime seconds | maxadvertinterval seconds | minadvertinterval seconds | preference number | address address [number]]
Syntax Description
multicast (Optional) Use the multicast address (224.0.0.1) instead of IP broadcasts. holdtime seconds (Optional) Length of time in seconds advertisements are held valid. Default is three times the maxadvertinterval value. Must be greater than maxadvertinterval and cannot be greater than 9000 seconds. maxadvertinterval seconds (Optional) Maximum interval in seconds between advertisements. The default is 600 seconds. minadvertinterval seconds (Optional) Minimum interval in seconds between advertisements. The default is 0.75 times the maxadvertinterval. If you change the maxadvertinterval value, this value defaults to three-quarters of the new value. preference number (Optional) Preference value. The allowed range is -231 to 231. The default is 0. A higher value increases the router's preference level. You can modify a particular router so that it will be the preferred router to which others home. address address [number] (Optional) IP address (address) to proxy-advertise, and optionally, its preference value (number).
To enable local-area mobility, use the ip mobile arp interface configuration command. To disable local-area mobility, use the no form of this command.
ip mobile arp [timers keepalive hold-time] [access-group access-list-number | name]
Syntax Description
timers (Optional) Indicates that you are setting local-area mobility timers. keepalive (Optional) Frequency, in seconds, at which the Cisco IOS software sends unicast ARP messages to a relocated host to verify that the host is present and has not moved. The default keepalive time is 300 seconds (5 minutes). hold-time (Optional) Hold time, in seconds. This is the length of time the software considers that a relocated host is present without receiving some type of ARP broadcast or unicast from the host. Normally, the hold time should be at least three times greater than the keepalive time. The default hold time is 900 seconds (15 minutes). access-group (Optional) Indicates that you are applying an access list. This access list applies only to local-area mobility. access-list-number (Optional) Number of a standard IP access list. It is a decimal number from 1 to 99. Only hosts with addresses permitted by this access list are accepted for local-area mobility. name (Optional) Name of an IP access list. The name cannot contain a space or quotation mark, and must begin with an alphabetic character to avoid ambiguity with numbered access lists.
To specify the address of one or more name servers to use for name and address resolution, use the ip name-server global configuration command. To remove the addresses specified, use the no form of this command.
ip name-server server-address1 [server-address2...server-address6]
Syntax Description
server-address1 IP addresses of name server. server-address2...server-address6 (Optional) IP addresses of additional name servers (a maximum of six name servers).
To designate that traffic originating from or destined for the interface is subject to Network Address Translation (NAT), use the ip nat interface configuration command. To prevent the interface from being able to translate, use the no form of this command.
ip nat {inside | outside}
Syntax Description
inside Indicates the interface is connected to the inside network (the network subject to NAT translation). outside Indicates the interface is connected to the outside network.
To enable Network Address Translation (NAT) of the inside destination address, use the ip nat inside destination global configuration command. To remove the dynamic association to a pool, use the no form of this command.
ip nat inside destination list {access-list-number | name} pool name
Syntax Description
list access-list-number Standard IP access list number. Packets with destination addresses that pass the access list are translated using global addresses from the named pool. list name Name of a standard IP access list. Packets with destination addresses that pass the access list are translated using global addresses from the named pool. pool name Name of the pool from which global IP addresses are allocated during dynamic translation.
To enable Network Address Translation (NAT) of the inside source address, use the ip nat inside source global configuration command. To remove the static translation or remove the dynamic association to a pool, use the no form of this command.
ip nat inside source {list {access-list-number | name} pool name [overload] | static local-ip
Syntax Description
list access-list-number Standard IP access list number. Packets with source addresses that pass the access list are dynamically translated using global addresses from the named pool. list name Name of a standard IP access list. Packets with source addresses that pass the access list are dynamically translated using global addresses from the named pool. pool name Name of the pool from which global IP addresses are allocated dynamically. overload (Optional) Enables the router to use one global address for many local addresses. When overloading is configured, each inside host's TCP or UDP port number distinguishes between the multiple conversations using the same local IP address. static local-ip Sets up a single static translation; this argument establishes the local IP address assigned to a host on the inside network. The address could be randomly chosen, allocated from RFC 1918, or obsolete. global-ip Sets up a single static translation; this argument establishes the globally unique IP address of an inside host as it appears to the outside world.
To enable Network Address Translation (NAT) of the outside source address, use the ip nat outside source global configuration command. To remove the static entry or the dynamic association, use the no form of this command.
ip nat outside source {list {access-list-number | name} pool name | static global-ip local-ip}
Syntax Description
list access-list-number Standard IP access list number. Packets with source addresses that pass the access list are translated using global addresses from the named pool. list name Name of a standard IP access list. Packets with source addresses that pass the access list are translated using global addresses from the named pool. pool name Name of the pool from which global IP addresses are allocated. static global-ip Sets up a single static translation. This argument establishes the globally unique IP address assigned to a host on the outside network by its owner. It was allocated from globally routable network space. local-ip Sets up a single static translation. This argument establishes the local IP address of an outside host as it appears to the inside world. The address was allocated from address space routable on the inside (RFC 1918, Address Allocation for Private Internets).
To define a pool of IP addresses for Network Address Translation (NAT), use the ip nat pool global configuration command. To remove one or more addresses from the pool, use the no form of this command.
ip nat pool name start-ip end-ip {netmask netmask | prefix-length prefix-length}[type rotary]
Syntax Description
name Name of the pool. start-ip Starting IP address that defines the range of addresses in the address pool. end-ip Ending IP address that defines the range of addresses in the address pool. netmask netmask Network mask that indicates which address bits belong to the network and subnetwork fields and which bits belong to the host field. Specify the netmask of the network to which the pool addresses belong. prefix-length prefix-length Number that indicates how many bits of the netmask are ones (how many bits of the address indicate network). Specify the netmask of the network to which the pool addresses belong. type rotary (Optional) Indicates that the range of address in the address pool identify real, inside hosts among which TCP load distribution will occur.
To change the amount of time after which Network Address Translation (NAT) translations time out, use the ip nat translation global configuration command. To disable the timeout, use the no form of this command.
ip nat translation [max-entries] {timeout | udp-timeout | dns-timeout | tcp-timeout | finrst-timeout | icmp-timeout | syn-timeout | port-timeout}seconds
Syntax Description
max-entries (Optional) Specifies the maximum number of NAT entries. timeout Specifies that the timeout value applies to dynamic translations except for overload translations. Default is 86400 seconds (24 hours). udp-timeout Specifies that the timeout value applies to the UDP port. Default is 300 seconds (5 minutes). dns-timeout Specifies that the timeout value applies to connections to the Domain Naming System (DNS). Default is 60 seconds. tcp-timeout Specifies that the timeout value applies to the TCP port. Default is 86400 seconds (24 hours). finrst-timeout Specifies that the timeout value applies to Finish and Reset TCP packets, which terminate a connection. Default is 60 seconds. icmp-timeout Specifies the timeout value for ICMP flows. Default is 60 seconds. syn-timeout Specifies the timeout value for TCP flows immediately after a SYN. Default is 60 seconds. port-timeout Specifies that the timeout value applies to the TCP/UDP port. seconds Number of seconds after which the specified port translation times out.
To specify the format in which netmasks are displayed in show command output, use the ip netmask-format line configuration command. To restore the default display format, use the no form of this command.
ip netmask-format {bitcount | decimal | hexadecimal}
Syntax Description
bitcount Addresses are followed by a slash and the total number of bits in the netmask. For example, 131.108.11.0/24 indicates that the netmask is 24 bits. decimal Network masks are displayed in dotted decimal notation (for example, 255.255.255.0). hexadecimal Network masks are displayed in hexadecimal format, as indicated by the leading 0X (for example, 0XFFFFFF00).
To configure the authentication string for an interface using Next Hop Resolution Protocol (NHRP), use the ip nhrp authentication interface configuration command. To remove the authentication string, use the no form of this command.
ip nhrp authentication string
Syntax Description
string Authentication string configured for the source and destination stations that controls whether NHRP stations allow intercommunication. The string can be up to eight characters long.
To change the number of seconds that NHRP nonbroadcast multiaccess (NBMA) addresses are advertised as valid in authoritative NHRP responses, use the ip nhrp holdtime interface configuration command. To restore the default value, use the no form of this command.
ip nhrp holdtime seconds
Syntax Description
seconds Time in seconds that NBMA addresses are advertised as valid in positive authoritative NHRP responses.
To control which IP packets can trigger sending a Next Hop Resolution Protocol (NHRP) Request, use the ip nhrp interest interface configuration command. To restore the default value, use the no form of this command.
ip nhrp interest access-list-number
Syntax Description
access-list-number Standard or extended IP access list number in the range 1 to 199.
To statically configure the IP-to-NBMA address mapping of IP destinations connected to a nonbroadcast, multiaccess (NBMA) network, use the ip nhrp map interface configuration command. To remove the static entry from NHRP cache, use the no form of this command.
ip nhrp map ip-address nbma-address
Syntax Description
ip-address IP address of the destinations reachable through the NBMA network. This address is mapped to the NBMA address. nbma-address NBMA address that is directly reachable through the NBMA network. The address format varies depending on the medium you are using. For example, ATM has an NSAP address, Ethernet has a MAC address, and SMDS has an E.164 address. This address is mapped to the IP address.
To configure NBMA addresses used as destinations for broadcast or multicast packets to be sent over a tunnel network, use the ip nhrp map multicast interface configuration command. To remove the destinations, use the no form of this command.
ip nhrp map multicast nbma-address
Syntax Description
nbma-address Nonbroadcast multiaccess (NBMA) address that is directly reachable through the NBMA network. The address format varies depending on the medium you are using.
To change the maximum frequency at which NHRP packets can be sent, use the ip nhrp max-send interface configuration command. To restore this frequency to the default value, use the no form of this command.
ip nhrp max-send pkt-count every interval
Syntax Description
pkt-count Number of packets that can be sent in the range from 1 to 65535. Default is 5 packets. every interval Time (in seconds) in the range from 10 to 65535. Default is 10 seconds.
To enable the Next Hop Resolution Protocol (NHRP) on an interface, use the ip nhrp network-id interface configuration command. To disable NHRP on the interface, use the no form of this command.
ip nhrp network-id number
Syntax Description
number Globally unique, 32-bit network identifier for a nonbroadcast, multiaccess (NBMA) network. The range is 1 to 4294967295.
To specify the address of one or more NHRP Next Hop Servers, use the ip nhrp nhs interface configuration command. To remove the address, use the no form of this command.
ip nhrp nhs nhs-address [net-address [netmask]]
Syntax Description
nhs-address Address of the Next Hop Server being specified. net-address (Optional) IP address of a network served by the Next Hop Server. netmask (Optional) IP network mask to be associated with the net IP address. The net IP address is logically ANDed with the mask.
To re-enable the use of forward record and reverse record options in NHRP Request and Reply packets, use the ip nhrp record interface configuration command. To suppress the use of such options, use the no form of this command.
ip nhrp recordSyntax Description
This command has no arguments or keywords.
To designate which interface's primary IP address the Next Hop Server will use in NHRP Reply packets when the NHRP requestor uses the Responder Address option, use the ip nhrp responder interface configuration command. To remove the designation, use the no form of this command.
ip nhrp responder type number
Syntax Description
type Interface type whose primary IP address is used when a Next Hop Server complies with a Responder Address option (for example, serial, tunnel). number Interface number whose primary IP address is used when a Next Hop Server complies with a Responder Address option.
To configure the interface to operate in NHRP server-only mode, use the ip nhrp server-only interface configuration command. To disable this feature, use the no form of this command.
ip nhrp server-only [non-caching]
Syntax Description
non-caching (Optional) The router will not cache NHRP information received on this interface.
To configure when Next Hop Resolution Protocol (NHRP) will set up and tear down a switched virtual circuit (SVC) based on aggregate traffic rates, use the ip nhrp trigger-svc interface configuration command. To restore the default thresholds, use the no form of this command.
ip nhrp trigger-svc trigger-threshold teardown-threshold
Syntax Description
trigger-threshold Average traffic rate calculated during the load-interval, at or above which NHRP will set up an SVC for a destination. The default value is 1 kbps. teardown-threshold Average traffic rate calculated during the load-interval, at or below which NHRP will tear down the SVC to the destination. The default value is 0 kbps.
To configure the software so that NHRP is deferred until the system has attempted to send data traffic to a particular destination multiple times, use the ip nhrp use interface configuration command. To restore the default value, use the no form of this command.
ip nhrp use usage-count
Syntax Description
usage-count Packet count in the range from 1 to 65535. Default is 1.
To enable the HP Probe Proxy support, which allows the Cisco IOS software to respond to HP Probe Proxy Name requests, use the ip probe proxy interface configuration command. To disable HP Probe Proxy, use the no form of this command.
ip probe proxySyntax Description
This command has no arguments or keywords.
To enable proxy ARP on an interface, use the ip proxy-arp interface configuration command. To disable proxy ARP on the interface, use the no form of this command.
ip proxy-arpSyntax Description
This command has no arguments or keywords.
Syntax Description
This command has no arguments or keywords.
To enable the use of subnet zero for interface addresses and routing updates, use the ip subnet-zero global configuration command. To restore the default, use the no form of this command.
ip subnet-zeroSyntax Description
This command has no arguments or keywords.
To enable IP processing on a serial interface without assigning an explicit IP address to the interface, use the ip unnumbered interface configuration command. To disable the IP processing on the interface, use the no form of this command.
ip unnumbered type number
Syntax Description
type number Type and number of another interface on which the router has an assigned IP address. It cannot be another unnumbered interface.
To display the entries in the ARP table, use the show arp privileged EXEC command.
show arpSyntax Description
This command has no arguments or keywords.
To display the default domain name, the style of name lookup service, a list of name server hosts, and the cached list of host names and addresses, use the show hosts EXEC command.
show hostsSyntax Description
This command has no arguments or keywords.
To display the IP addresses mapped to TCP ports (aliases) and SLIP addresses, which are treated similarly to aliases, use the show ip aliases EXEC command.
show ip aliasesSyntax Description
This command has no arguments or keywords.
To display the Address Resolution Protocol (ARP) cache, where SLIP addresses appear as permanent ARP table entries, use the show ip arp EXEC command.
show ip arp [ip-address] [hostname] [mac-address] [type number]
Syntax Description
ip-address (Optional) ARP entries matching this IP address are displayed. hostname (Optional) Host name. mac-address (Optional) 48-bit MAC address. type number (Optional) ARP entries learned via this interface type and number are displayed.
To display the usability status of interfaces configured for IP, use the show ip interface EXEC command.
show ip interface [type number]
Syntax Description
type (Optional) Interface type. number (Optional) Interface number.
To display IRDP values, use the show ip irdp EXEC command.
show ip irdpSyntax Description
This command has no arguments or keywords.
To display the masks used for network addresses and the number of subnets using each mask, use the show ip masks EXEC command.
show ip masks address
Syntax Description
address Network address for which a mask is required.
To display Network Address Translation (NAT) statistics, use the show ip nat statistics EXEC command.
show ip nat statisticsSyntax Description
This command has no arguments or keywords.
To display active Network Address Translation (NAT) translations, use the show ip nat translations EXEC command.
show ip nat translations [verbose]
Syntax Description
verbose (Optional) Displays additional information for each translation table entry, including how long ago the entry was created and used.
To display the Next Hop Resolution Protocol (NHRP) cache, use the show ip nhrp EXEC command.
show ip nhrp [dynamic | static] [type number]
Syntax Description
dynamic (Optional) Displays only the dynamic (learned) IP-to-NBMA address cache entries. static (Optional) Displays only the static IP-to-NBMA address entries in the cache (configured through the ip nhrp map command). type (Optional) Interface type about which to display the NHRP cache (for example, atm, tunnel). number (Optional) Interface number about which to display the NHRP cache.
To display Next Hop Resolution Protocol (NHRP) traffic statistics, use the show ip nhrp traffic EXEC command.
show ip nhrp trafficSyntax Description
This command has no arguments or keywords.
To specify the format in which netmasks are displayed in show command output, use the term ip netmask-format EXEC command. To restore the default display format, use the no form of this command.
term ip netmask-format {bitcount | decimal | hexadecimal}
Syntax Description
bitcount Addresses are followed by a slash and the total number of bits in the netmask. For example, 131.108.11.55/24 indicates that the netmask is 24 bits. decimal Netmasks are displayed in dotted decimal notation (for example, 255.255.255.0). hexadecimal Netmasks are displayed in hexadecimal format, as indicated by the leading 0X (for example, 0XFFFFFF00).
Posted: Wed Jul 26 14:02:32 PDT 2000
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