nanog mailing list archives
Re: DNS traffic sourced from my address space to myself.
From: Jon Lewis <jlewis () lewis org>
Date: Wed, 7 Jul 2010 08:25:39 -0400 (EDT)
On Wed, 7 Jul 2010, Drew Weaver wrote:
Recently I have been noticing a good amount of totally bogus DNS traffic coming in on my transit links via my own IP addresses (spoofed). SLOT 2:Jul 2 11:26:02 EDT: %SEC-6-IPACCESSLOGP: list 119 permitted udp x.x.145.161(0) -> x.x.145.235(0), 1 packet SLOT 2:Jul 2 11:26:02 EDT: %SEC-6-IPACCESSLOGP: list 119 permitted udp x.x.146.74(0) -> x.x.145.235(0), 1 packet SLOT 2:Jul 2 11:26:02 EDT: %SEC-6-IPACCESSLOGP: list 119 permitted udp x.x.146.70(0) -> x.x.145.235(0), 1 packet SLOT 2:Jul 2 11:26:02 EDT: %SEC-6-IPACCESSLOGP: list 119 permitted udp x.x.146.57(0) -> x.x.145.235(0), 1 packet There are multiple different instances of this traffic, the pattern seems to be: -The source is always 'my own IPs' and obviously spoofed. -It's DNS traffic -The "source addresses" all seem to be randomly chosen from the same /23 as the destination address (they cycle through randomly). Has anyone else noticed anything similar coming in on their transit links or am I just lucky?
I posted the same thing June 16, 2010. Search for Subject: Todd Underwood was a little lateIf you can capture some of the traffic and see what the DNS requests are, that would let you see if its the same sort of issue I was seeing or something different.
---------------------------------------------------------------------- Jon Lewis | I route Senior Network Engineer | therefore you are Atlantic Net | _________ http://www.lewis.org/~jlewis/pgp for PGP public key_________
Current thread:
- DNS traffic sourced from my address space to myself. Drew Weaver (Jul 07)
- Re: DNS traffic sourced from my address space to myself. Jon Lewis (Jul 07)
- Re: DNS traffic sourced from my address space to myself. bmanning (Jul 07)