10-16-2007 03:26 AM - edited 03-05-2019 07:06 PM
Hi all,
I would like to know what is decimal equvalent for ICMP type ttl-exceeded?
Some of them I could use as:
0 - for echo-reply
8 - for echo
11 - for time-exceeded
I know that I can use syntax as:
permit icmp any any ttl-exceeded
but I would like to know what is decimal equvalent for it.
Best regards,
Vladimir
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10-16-2007 07:09 AM
That's type 3 code 4
10-16-2007 04:46 AM
I dont think ttl-exeeded type exist.
ttl-exceeded is (TYPE 11,CODE 0)
ICMP message have a code field (8bit) that can give you further info.
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10-16-2007 04:47 AM
10-16-2007 06:08 AM
Thanks for quick answer!, Does it mean than that:
permit icmp any any ttl-exceeded
will allow only ICMP packets type 11 with code O and
permit icmp any any time-exceeded
will allow all ICMP type 11 with code 0 or 1?
Am I correct?
I have found a way how to add rules as ICMP type and code:
permit icmp any any 11
permit icmp any any 11 0
permit icmp any any 11 1
will apear as:
permit icmp any any time-exceeded
permit icmp any any ttl-exceeded
permit icmp any any reassembly-timeout
Also I'm confused with packet-to-big. By RFC 1885 it is Type 2 Code 0. But under Cisco ISO 12.4:
permit icmp any any 2 0
rule will not apear as:
permit icmp any any packet-too-big
am I wrong about packet-too-big icmp type and code that is used by Cisco?
regards,
Vladimir
10-16-2007 07:09 AM
That's type 3 code 4
10-16-2007 09:36 PM
Hi,
For more on ICMP types, refer below link :
http://www.networksorcery.com/enp/default0901.htm
Thanks,
Vijaybabu
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