> # ICMP Information

> IP packets can be filtered based on the following optional ICMP conditions:

> - icmp-type—The ICMP message type is a number from 0 to 255.
> - icmp-code—The ICMP message code is a number from 0 to 255.

> Table 35-2 displays the value for each ICMP type.

> Table 35-2 ICMP Type Value
> ICMP Type1 | Code
> --- | ---
> echo | 8
> echo-reply | 0
> destination unreachable | 3
> traceroute | 30
> time exceeded | 11

> 1ICMP redirect packets are always rejected.

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