Web OS 10.0 Application GuideChapter 7: Filtering n 201212777-A, February 2002Matching ICMP Message TypesInternet 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 packetscan be filtered using the proto icmp option, by default, the Web switch ignores the ICMPmessage type when matching a packet to a filter. To perform filtering based on specific ICMPmessage types, ICMP message type filtering must be enabled.Web OS software supports filtering on the following ICMP message types:Table 7-6 ICMP Message TypesType # Message Type Description0 echorep ICMP echo reply3 destun ICMP destination unreachable4 quench ICMP source quench5 redir ICMP redirect8 echoreq ICMP echo request9 rtradv ICMP router advertisement10 rtrsol ICMP router solicitation11 timex ICMP time exceeded12 param ICMP parameter problem13 timereq ICMP timestamp request14 timerep ICMP timestamp reply15 inforeq ICMP information request16 inforep ICMP information reply17 maskreq ICMP address mask request18 maskrep ICMP address mask reply
