C. Router CLI Commands, Codes, and Designations
9128-A2-GB20-80 September 2002 C-31
Protocol and Port Designations

The following tables are used for filtering.

ICMP Designations

Use the Internet Control Management Protocol (ICMP) designations in Table C-15,

ICMP Designations, when specifying a specific ICMP message to be filtered.

Table C-15. ICM P Designations (1 of 2)

Type Code ICMP Message Description

0 0 echo-reply Echo (ping) reply
All 3
n
= Destination unreachable
3 0 net-unreachable Network unreachable
3 1 host-unreachable Host unreachable
3 2 protocol-unreachable Protocol unreachable
3 3 port-unreachable Port unreachable
3 4 packet-too-big Fragmentation needed and do not
fragment (DF) bit set
3 5 source-route-failed Source route failed
3 6 network-unknown Destination network unknown
3 7 host-unknown Destination host unknown
3 8 host-isolated Source host isolated
3 9 dod-net-prohibited Destination network admin prohibited
3 10 dod-host-prohibited De stination host admin prohibited
3 11 net-tos-unreachable Network unreachable for TOS (Type
of Service)
3 12 host-tos-unreachable Host unreachable for TOS
3 13 Administratively-prohibited Communication admin. prohibited by
filtering
3 14 host-precedence-unreachable Host precedence violation
3 15 precedence-unreachable Precedence cutoff in effect
4 0 source-quench Source quench (flow control)