Date: Tue, 06 Jan 1998 16:43:27 -0500 From: Eric Germann <ekgermann@cctec.com> Subject: Re: UDP port 137 Question To: d-nordlund@UKANS.EDU Cc: nanog@merit.edu
One would hope the backbones aren't passing 255.255.255.255 around to come in via his Internet connection
One would hope........ ! But you can't assume!
At 01:17 PM 1/6/98 +0000, DAVE NORDLUND wrote:
Date: Tue, 06 Jan 1998 12:54:52 -0500 (EST) From: "C. Jon Larsen" <jlarsen@ford.ajtech.com> Subject: UDP port 137 Question To: nanog@merit.edu
Is there any *valid* reason to see UDP traffic directed at a unix box's port 137 coming from IP sources across the internet ? The unix servers in question are most definitely *not* running samba, and there is
absolutely no
NT anywhere on this customer's network (that is seeing the incoming UDP traffic directed at an IP destination address on port 137). (A couple of 95 boxes scattered across an Ethernet comprise the Micro$oft part of the network). None of the 95 boxen are running any file or print serving (sharing) resources.
Are you shure these don't have ip broadcast addresses on them? I've seen MS UDP packets with 255.255.255.255 as the destination address if the WIN box isn't set up reasonably.
I can't think of any valid reason to see this traffic, personally.
Anybody out
there that can present a scenario where I would expect to see these UDP packets coming back in ?
netbios-ns 137/tcp nbns netbios-ns 137/udp nbns netbios-dgm 138/tcp nbdgm netbios-dgm 138/udp nbdgm netbios-ssn 139/tcp nbssn
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Dave Nordlund d-nordlund@ukans.edu University of Kansas 913/864-0450 Computing Services FAX 913/864-0485 Lawrence, KS 66045 KANREN
============================================================================ ==== Eric Germann Computer and Communications Technologies ekgermann@cctec.com Van Wert, OH 45891 Phone: 419 968 2640 http://www.cctec.com Fax: 419 968 2641
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Dave Nordlund d-nordlund@ukans.edu University of Kansas 913/864-0450 Computing Services FAX 913/864-0485 Lawrence, KS 66045 KANREN