IPFW and ICMP with timestamp option

[Malcolm Clarke]

I have configured a machine with 2 NIC and IPFW in a rather simplistic 
way as we are using it to emulate different link characteristics rather 
than as an actual firewall.

00100 4 355 pipe 1 ip from any to any via de0 
in                              
00200 1  56 pipe 2 ip from any to any via de0 
out                             
00300 0   0 pipe 3 ip from any to any via de1 
in                              
00400 3 288 pipe 4 ip from any to any via de1 
out                             
65535 4 246 deny ip from any to 
any                                           

The configuration works fine and traffic crosses the firewall without 
problem, except ICMP packets having timestamp or routing option, and 
these are not returned.

Is there a way to allow these packets to enter/exit the firewall?

Regards

Malcolm

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Dr Malcolm Clarke
Senior Lecturer in Data Communication Systems and Telemedicine
Department of Information Systems and Computing
Brunel University
Uxbridge
Middlesex
UB8 3PH
UK

Tel: +44 1895 265053
Fax: +44 1895 251686
http://www.brunel.ac.uk/about/acad/siscm/research/themes/is/groups/bright/people

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