RE: [Snort-users] exporting snort logs

IIRC, the "content" of ICMP unreachables (of which a "administratively
prohibited" is a flavor) should be the header of the packet that triggered
the unreachable message. You can either parse that manually, or (for the
lazy among us - which would be me) capture a bunch of the icmp unreachables
and look at them in ethereal, which will parse the included header for you.
From that you *should* be able to get a fairly good idea of what is being
denied.

-Joe

> -----Original Message-----
> From: snort-users-admin@lists.sourceforge.net
> [mailto:snort-users-admin@lists.sourceforge.net]On Behalf Of Endre
> Szekely-Bencedi
> Sent: Wednesday, November 24, 2004 4:12 AM
> To: snort-users@lists.sourceforge.net
> Cc: Andras Kalmar; Basselgia, Barry A Mr (NAF Atsugi)
> Subject: RE: [Snort-users] exporting snort logs
>
>
>
> Hi, thanks for the reply.
> The idea is that before contacting those people I should know why these
> machines are trying to pass that router. :)
> We are a consultancy company that provides services to another company and
> we have a subnet in their network (A class ntework). So it is a huge
> network.
> The whole problem is this I believe, why these machines are trying to
> contact it (what software does this, actually...).
> I know only tcpdump to figure this out and tried it but didn't manage to
> see anything understable. There is a lot of 'spam' (packets) for
> example to
> an exchange server on customer side (that is normal).. and some packets
> that had 'SMB' somewhere.. perhaps it is something that tries to access
> netbios shares there, and those infamous netbios ports are denied.
> Anyway I am not sure anyone can help me with this, I'll have to answer the
> questions myself.
> A hint on some tools / methods for identifying traffic would be more than
> welcome, if possible.
>
> Thanks for your patience, I'm a security noob who has some clues about
> security / networking, but that's all. :) Sorry for that.
>
>
> Greetings,
> Endre Szekely-Bencedi
>
>
>
>
>
>
> "Basselgia, Barry A
>
>
> Mr (NAF Atsugi)" To: "'Endre
> Szekely-Bencedi'" <Endre.Szekely-Bencedi@hu-tcs.com>,
>
> <BABasselgia@atsugi
> snort-users@lists.sourceforge.net
>
> .navy.mil> cc: Andras
> Kalmar <Andras.Kalmar@hu-tcs.com>
>
> Subject: RE:
> [Snort-users] exporting snort logs
>
> 11/24/2004 01:20 AM
>
>
>
>
>
>
>
>
>
>
>
>
> Can't help with the export thing.
>
> But, on your question regarding "communications administratively
> prohibited". This means the router that is sending the messages is
> configured to block your network/ip address. The only way to correct this
> would be to identify who the router(s) belongs to and contact them to find
> out why your being blocked. So, this isn't really a "False Alarm". And
> obviously, if you have 100,000 hits something on your network is trying to
> get through those routers.
>
>
>
>
> -----Original Message-----
> From: snort-users-admin@lists.sourceforge.net
> [mailto:snort-users-admin@lists.sourceforge.net]On Behalf Of Endre
> Szekely-Bencedi
> Sent: Tuesday, November 23, 2004 8:36 PM
> To: snort-users@lists.sourceforge.net
> Cc: Andras Kalmar
> Subject: [Snort-users] exporting snort logs
>
>
> ...
> Also, how you guys manage to identify false alarms? I am getting
> alerts for
> "communication administratively prohibited" or something like that from a
> few routers outside of our network for 19 IP addresses (8 machines) from
> our network - there are like 140 machines - and this is up to almost
> 100,000. I did not manage to determinde yet what is causing this huge
> amount of alerts... tcpdump looks pretty encrypted to me, didn't see
> anything interesting yet just lots of packets towards our proxy server and
> to some exchange server...
>
> Any hints on how to do this? Perhaps some tools ... ?
>
> ...
>
> Greetings,
> Endre
>
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