Todd Underwood was a little late

Mark Andrews marka at
Thu Jun 17 02:07:33 UTC 2010

In message <Pine.LNX.4.61.1006162044210.5148 at>, Jon Lewis write
> I just took a closer look at something odd I'd noticed several days ago. 
> One of our DNS servers was sending crazy amounts of ARP requests for IPs 
> in the /24 its main IP is in.  What I've found is we're getting hit with 
> DNS requests that look like they're from "typical internet traffic for 
> someone in China" hitting this DNS server from IPs in its /24 which are 
> currently not in use (at least on our local network).  It would appear 
> someone in China is using our IP space, presumably behind a NAT router, 
> and they're leaking some traffic non-NAT'd.

Why was this traffic hitting your DNS server in the first place?  It should
have been rejected by the ingress filters preventing spoofing of the local

Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka at

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