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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. ICMP 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 Destination 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)