[Snort-users] Bad Protocol?

J Irving j at ...7839...
Sun Jan 5 14:02:06 EST 2003


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Hi Mike

Could you post a tcpdump -x of the packet in question?  Many
anomalous IP tweaks can evade interpretation by tools that...uh
...interpret.  tcpdump -x should give you the actual content of
the packet (well, the headers and a bit of payload (probably)),
which you could then compare to RFCs, Richard Stevens, or
whichever authority you prefer.

cheers
j

* Mike Koponick <mike at ...7385...> [2003.01.05 09:30 -0800]:
> From: "Mike Koponick" <mike at ...7385...>
> To: <snort-users at lists.sourceforge.net>
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> Subject: [Snort-users] Bad Protocol?
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> X-Original-Date: Sun, 5 Jan 2003 09:30:20 -0800
> Date: Sun, 5 Jan 2003 09:30:20 -0800
> 
> Now that I have decent loggin working, I'm getting some messages that appear
> to be normal packets, but SNORT seems to think that something is wrong with
> them. I think it might be a rule problem.. has anyone else seen this?
> 
> 01/05-17:33:24.184929  [**] [118:1:1] (spp_conversation) Bad IP protocol!
> [**] {UDP} 192.168.xx.xx:514 -> 192.168.xx.xx:514
> 
> Obviously, this is a SYSLOG message, which we do have a node on the network
> logging to the snort box for syslog parsing.
> 
> This is what the packet looks like:
> 
> [**] (spp_conversation) Bad IP protocol! [**]
> 01/04-15:56:38.598158 192.168.xx.xx:514 -> 192.168.xx.xx:514
> UDP TTL:255 TOS:0x0 ID:46088 IpLen:20 DgmLen:171
> 
> Thanks in advance for your help.
> 
> Mike
> 
> 
> 
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