Looks like one of my name servers (CentOS 5) gets a lot of malicious
queries. The cpu load is constantly about 3 %. I put on stricter limits
on who is allowed recursive queries, but this does not affect the CPU
load. I also updated bind.
I temporarily turned on querylog (command: rndc querylog), and noticed
that I get over 200 queries like this per second:
> Aug 17 07:41:38 mx2 named[6873]: client 205.145.64.200#53: query (cache) 'ripe.net/ANY/IN' denied
> Aug 17 07:41:38 mx2 named[6873]: client 204.10.45.5#53: query (cache) 'ripe.net/ANY/IN' denied
> Aug 17 07:41:38 mx2 named[6873]: client 78.40.35.212#53: query (cache) 'ripe.net/ANY/IN' denied
> Aug 17 07:41:38 mx2 named[6873]: client 207.207.3.126#53: query (cache) 'ripe.net/ANY/IN' denied
Are there any ways to mitigate this, or do I just have to wait?
- Jussi
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