nanog mailing list archives
RE: is your host or dhcp server sending dns dynamic updates for rfc1918?
From: Bruce Williams <brucewms () pacbell net>
Date: Fri, 19 Apr 2002 14:15:17 -0700
-----Original Message----- From: owner-nanog () merit edu [mailto:owner-nanog () merit edu]On Behalf Of Valdis.Kletnieks () vt edu Sent: Friday, April 19, 2002 6:39 AM To: Greg Maxwell Cc: nanog () merit edu Subject: Re: is your host or dhcp server sending dns dynamic updates for rfc1918? On Fri, 19 Apr 2002 09:03:51 EDT, Greg Maxwell <gmaxwell () martin fl us> said:Does anyone already have a SNORT signature to match onthese updates toaid in tracking down which hosts behind a NAT are guiltyfor generatingthis garbage?The problem is that the sites that are the big offenders are probably not the sort of sites that would run Snort. Now, think about it - one /32 popped of *30K* of these in 4 hours - and a 'dig -x' shows it to apparently be a DSL line. So we're seeing 2 or 3 DCHP events *PER SECOND* behind that NAT. Either they've got a bunch of machines doing the Reboot Shuffle and have bigger problems, or they're big enough that 2-3 DHCP per second is reasonable (at which point you have to wonder how they're THAT big, and depending on a DSL line.. ;)
I had a dynamic-dns client on my home ADSL system that was generating requests at that rate a few months ago - I read logs and fixed it, don't remember how... so this DOES happen ( and to people who do not read logs.. ) Bruce Williams Benchmarks: Engineering wants to see how fast they can get the wheels to spin on a car. Operations wants to know how fast the car will go. These are different.
Current thread:
- Re: is your host or dhcp server sending dns dynamic updates for rfc1918?, (continued)
- Re: is your host or dhcp server sending dns dynamic updates for rfc1918? bert hubert (Apr 19)
- Re: is your host or dhcp server sending dns dynamic updates for rfc1918? Paul Vixie (Apr 19)
- Re: is your host or dhcp server sending dns dynamic updates for rfc1918? David Conrad (Apr 19)
- RE: is your host or dhcp server sending dns dynamic updates for rfc1918? Jeroen Massar (Apr 19)
- RE: is your host or dhcp server sending dns dynamic updates for rfc1918? Daniel Senie (Apr 19)
- Re: is your host or dhcp server sending dns dynamic updates for rfc1918? Derek J. Balling (Apr 19)
- Re: is your host or dhcp server sending dns dynamic updates for Paul Vixie (Apr 19)
- Re: is your host or dhcp server sending dns dynamic updates for Bill Woodcock (Apr 19)
- Re: is your host or dhcp server sending dns dynamic updates for Paul Vixie (Apr 19)
- Re: is your host or dhcp server sending dns dynamic updates for rfc1918? Greg Maxwell (Apr 19)
- Re: is your host or dhcp server sending dns dynamic updates for rfc1918? Valdis . Kletnieks (Apr 19)
- RE: is your host or dhcp server sending dns dynamic updates for rfc1918? Bruce Williams (Apr 19)
- Re: is your host or dhcp server sending dns dynamic updates for rfc1918? Valdis . Kletnieks (Apr 19)
- Re: is your host or dhcp server sending dns dynamic updates for rfc1918? Mike Parson (Apr 19)
- RE: is your host or dhcp server sending dns dynamic updates for rfc1918? Ukyo Kuonji (Apr 19)
- RE: is your host or dhcp server sending dns dynamic updates for rfc1918? Eric Germann (Apr 19)
- Re: is your host or dhcp server sending dns dynamic updates for rfc1918? Paul A Vixie (Apr 19)
- Re: is your host or dhcp server sending dns dynamic updates for rfc1918? Paul A Vixie (Apr 19)
- Re: is your host or dhcp server sending dns dynamic updates for rfc1918? Simon Higgs (Apr 19)
- Re: is your host or dhcp server sending dns dynamic updates for rfc1918? Pete Ehlke (Apr 19)
- Re: is your host or dhcp server sending dns dynamic updates for rfc1918? Simon Higgs (Apr 19)
- Re: is your host or dhcp server sending dns dynamic updates for rfc1918? Valdis . Kletnieks (Apr 19)
- Re: is your host or dhcp server sending dns dynamic updates for rfc1918? Simon Higgs (Apr 19)
- connections to SOA mname? bert hubert (Apr 20)
- Re: is your host or dhcp server sending dns dynamic updates for rfc1918? bert hubert (Apr 19)