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 late
If 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 |
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