nanog mailing list archives
Re: ? how cisco router handle the out-of-order ICMP echo-reply packets
From: Steve Bertrand <steve () ibctech ca>
Date: Tue, 06 Jan 2009 08:52:02 -0500
Scott Morris wrote:
There aren't sequence numbers with ICMP. And the timeout value is watched/triggered before the next ICMP is sent, so there shouldn't really be any ordering problem/interpretation anyway.
FYI, from RFC 792: Sequence Number Description The data received in the echo message must be returned in the echo reply message. The identifier and sequence number may be used by the echo sender to aid in matching the replies with the echo requests. For example, the identifier might be used like a port in TCP or UDP to identify a session, and the sequence number might be incremented on each echo request sent. The echoer returns these same values in the echo reply. Steve
Current thread:
- ? how cisco router handle the out-of-order ICMP echo-reply packets Zhao Ping (Jan 06)
- Re: ? how cisco router handle the out-of-order ICMP echo-reply packets Tom Storey (Jan 06)
- RE: ? how cisco router handle the out-of-order ICMP echo-reply packets Scott Morris (Jan 06)
- RE: ? how cisco router handle the out-of-order ICMP echo-reply packets Mikael Abrahamsson (Jan 06)
- Re: ? how cisco router handle the out-of-order ICMP echo-reply packets Steve Bertrand (Jan 06)
- Re: ? how cisco router handle the out-of-order ICMP echo-reply packets Steve Bertrand (Jan 06)
- RE: ? how cisco router handle the out-of-order ICMP echo-reply packets Scott Morris (Jan 06)