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Traceroute and ICMP

cisco_lite
Level 1
Level 1

‎03-09-2009 06:24 AM - edited ‎03-06-2019 04:28 AM

Would traceroute work if ICMP is blocked on the way to the destination.

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Harold Ritter
Cisco Employee
Cisco Employee

‎03-09-2009 06:34 AM

This will not work if the traceroute command is issued from a MS platform, as it uses icmp request message as probe packets. Unix based hosts and Cisco routers on the other hand use UDP probe packets, so it should work in this case.

Regards

Harold Ritter
Sr Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
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Jon Marshall
Hall of Fame
Hall of Fame

‎03-09-2009 06:35 AM

The answer is it depends.

Some OS's use ICMP for traceroute so yes if you blocked all ICMP you would block traceroute as well. Other OS's use UDP. See this doc for more details -

http://www.cisco.com/en/US/tech/tk364/technologies_tech_note09186a00801ae32a.shtml

Jon

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