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From: James <wireless@tampabay.rr.com>
To: gentoo-user@lists.gentoo.org
Subject: [gentoo-user]  OT: A netbios-ssn blocking rule?
Date: Fri, 18 Aug 2006 19:59:59 +0000 (UTC)	[thread overview]
Message-ID: <loom.20060818T212303-706@post.gmane.org> (raw)
Message-ID: <20060818195959.jUILNN3i-sGPxKTzApfUGO4ElFSks9xM96MZZV2dDoA@z> (raw)

Hello,

My iptables based firewall seem to be working, However, I keep getting
triplets of this activity:

Problem (2286 > netbios-ssn)
source     dest.      proto   info
curious.ip www.me.com tcp     2286 > netbios-ssn Seq=0 Len=0 MSS=1460
www.me.com curious.ip tcp     netbios-ssn > 2286 [RST, ACK] Seq=0 Ack=1 
Win=0 Len=0

Any ideas on a rule to drop these requests to my web server?

similarly I see the same thing except the info section is slightly 
different:
similar problem (2469 > microsoft-ds)
rouge.ip   www.me.com tcp     2469 > microsoft-ds Seq=0 Len=0 MSS=1460

and the response from my firewall is simialr
www.me.com rouge.ip   tcp     microsoft-ds > 2469 [RST, ACK] Seq=0 Ack=1 
Win=0 Len=0

Other problems are (info section is only difference) epmap > 3081
                                                     3081 > epmap

Each of these appear in tripplets... and seem useless. Are they
part of something stupidly done by microsoft?  I think not
because they occur quite frequently, almost systematcially,
leading me to suspect they are part of nefarious activities?

The only change is the port numbers (2286; 2469; 3081) and the 
source IP address change after each triplet of queries.

Any ideas, information and iptables rules to silently drop these 
queries are most welcome. I see them all day long.


James




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gentoo-user@gentoo.org mailing list



             reply	other threads:[~2006-08-18 20:05 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-08-18 19:24 James [this message]
2006-08-18 19:59 ` [gentoo-user] OT: A netbios-ssn blocking rule? James
2006-08-18 21:43 ` Daniel Iliev
2006-08-21  4:11   ` [gentoo-user] " James
2006-08-23 21:33     ` Daniel Iliev
2006-08-23 21:46       ` gentuxx
2006-08-24  1:36         ` Daniel Iliev

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