In message <Pine.LNX.4.61.1006162044210.5148@soloth.lewis.org>, Jon Lewis write s:
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 network. Mark -- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: marka@isc.org