Security Incidents mailing list archives

Unknown/Weird Traffic?


From: gs-list <gs-list () glsrms com>
Date: Sun, 14 Jul 2002 14:56:04 -0500

Folks:

I have a question that I cannot seem to answer. I just set up a firewall box for a wireless network on SuSE 7.1. I just built a new kernel (2.2.20) and am still having a strange issue.

Apparently, this box, (let's call it "28.100") is not properly interpreting ARP traffic. When using TETHEREAL to capture traffic, I see this:

28.97.0.0 -> 0.0.0.0 IP Fragmented IP protocol (proto=rdp 0x1b, off=18584)
28.97.0.0 -> 0.0.0.0 IP Fragmented IP protocol (proto=rdp 0x1b, off=18584)
28.97.0.0 -> 0.0.0.0 IP Fragmented IP protocol (proto=rdp 0x1b, off=18584)
28.97.0.0 -> 0.0.0.0 IP Fragmented IP protocol (proto=rdp 0x1b, off=18584)
28.97.0.0 -> 0.0.0.0 IP Fragmented IP protocol (proto=rdp 0x1b, off=18584)
28.97.0.0 -> 0.0.0.0 IP Fragmented IP protocol (proto=rdp 0x1b, off=18584)

However, at the same time, I monitor the same line from another (identical) machine, running SuSE 7.1 and Kernel 2.2.20, I get:

00:c0:49:13:b8:1b -> ff:ff:ff:ff:ff:ff ARP Who has 216.12.28.98? Tell 216.12.28.97 00:c0:49:13:b8:1b -> ff:ff:ff:ff:ff:ff ARP Who has 216.12.28.106? Tell 216.12.28.97 00:c0:49:13:b8:1b -> ff:ff:ff:ff:ff:ff ARP Who has 216.12.28.106? Tell 216.12.28.97 00:c0:49:13:b8:1b -> ff:ff:ff:ff:ff:ff ARP Who has 216.12.28.106? Tell 216.12.28.97 00:c0:49:13:b8:1b -> ff:ff:ff:ff:ff:ff ARP Who has 216.12.28.106? Tell 216.12.28.97

It appears that in the first example, the machine is not properly interpreting ARP traffic.

Any ideas on how to remedy this situation?

Thanks,
Gregg Sperling
glsrms.com administrator



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