Network Router User Manual

Web OS 10.0 Application Guide
Chapter 7: Filtering
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212777-A, February 2002
Matching ICMP Message Types
Internet Control Message Protocol (ICMP) is used for reporting TCP/IP processing errors.
There are numerous types of ICMP messages, as shown in Table 7-6. Although ICMP packets
can be filtered using the proto icmp option, by default, the Web switch ignores the ICMP
message type when matching a packet to a filter. To perform filtering based on specific ICMP
message types, ICMP message type filtering must be enabled.
Web OS software supports filtering on the following ICMP message types:
Table 7-6 ICMP Message Types
Type # Message Type Description
0 echorep ICMP echo reply
3 destun ICMP destination unreachable
4 quench ICMP source quench
5 redir ICMP redirect
8 echoreq ICMP echo request
9 rtradv ICMP router advertisement
10 rtrsol ICMP router solicitation
11 timex ICMP time exceeded
12 param ICMP parameter problem
13 timereq ICMP timestamp request
14 timerep ICMP timestamp reply
15 inforeq ICMP information request
16 inforep ICMP information reply
17 maskreq ICMP address mask request
18 maskrep ICMP address mask reply