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Old 06-30-2003, 04:46 AM   #1
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Registered: Jun 2003
Distribution: FreeBSD
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Smile IPFW Firewall pppd based

Hello to all.

My question is:
I have freebsd server with 2 network cards, i use it for nat and i would like to know how module DUMMYNET can be helpful in filtering imcp "smurf". Does omeone know how to limit icmp smurf but allow normal ping to my host?
Old 07-01-2003, 02:37 AM   #2
Registered: Apr 2002
Location: Rouen, France
Distribution: Slackware, FreeBSD
Posts: 34

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Type sysctl -a | grep icmp to see all kernel variables related to ICMP. You have icmplim which limit the number of ICMP packets by second and log_redirect, drop_redirect ...
In the same way, look in the kernel configuration file (in /usr/src/sys/i386/conf), you'll find ICMP options.
In IPFW, you'll only find parameters to drop or not ICMP packets.
I think DUMMYNET is only for TCP not for ICMP.
Hope it helps
Old 07-01-2003, 02:44 AM   #3
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Registered: Jun 2003
Distribution: FreeBSD
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