From: Copleston Daniel (Daniel.Copleston@ukomfs.com)
Date: Thu May 15 2003 - 03:44:14 GMT-3
Although ICMP does not have the concept of port it does have an identifier
part of the header, perhaps unrelated to this query but this explains how
multiple pings / traces can be run through overloaded NAT without confusion
about whose return response is whose reigning. This is briefly outlined in
RFC3022:
"In addition to TCP/UDP sessions, ICMP messages, with the exception of
REDIRECT message type may also be monitored by NAPT router. ICMP query type
packets are translated similar to that of TCP/UDP packets, in that the
identifier field in ICMP message header will be uniquely mapped to a query
identifier of the registered IP address. The identifier field in ICMP query
messages is set by Query sender and returned unchanged in response message
from the Query responder. So, the tuple of (Local IP address, local ICMP
query identifier) is mapped to a tuple of (registered IP address, assigned
ICMP query Identifier) by the NAPT router to uniquely identify ICMP queries
of all types from any of the local hosts. Modifications to ICMP error
messages are discussed in a later section, as that involves modifications to
ICMP payload as well as the IP and ICMP headers. "
Thanks,
Daniel
-----Original Message-----
From: Scott Morris [mailto:swm@emanon.com]
Sent: 14 May 2003 22:16
To: 'Jason Graun'; ccielab@groupstudy.com
Subject: RE: TCP ping
As another idea, the ICMPD (?) uses tcp port 5813.
It's a unix thing.
For port numbers, check out www.iana.org/assignments/port-numbers
Scott
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Jason Graun
Sent: Wednesday, May 14, 2003 2:40 PM
To: ccielab@groupstudy.com
Subject: RE: TCP ping
Cool what TCP port does ICMP use?
-----Original Message-----
From: Lance Cockcroft [mailto:lcockcroft@SelfTestSoftware.com]
Sent: Wednesday, May 14, 2003 1:30 PM
To: Jason Graun; ccielab@groupstudy.com
Subject: RE: TCP ping
Ping does not use a TCP port number since it is a network layer
protocol.
Lance Cockcroft
Cisco Product Manager
770-643-3635
-----Original Message-----
From: Jason Graun [mailto:jgraun@attbi.com]
Sent: Wednesday, May 14, 2003 12:50 PM
To: ccielab@groupstudy.com
Subject: TCP ping
What TCP port does ping use?
Thanks for the help
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