DNS deluge for x.p.ctrc.cc

Jon Lewis jlewis at lewis.org
Sat Feb 25 21:42:07 UTC 2006

On Fri, 24 Feb 2006, Chris Adams wrote:

> One thing to note: we've discovered that on some common DSL routers, the
> internal DNS caching server is on by default and answers requests on the
> outside IP address.  IIRC some even do it when configured for NAT.
> So, even when you disable outside recursion, things you may not think of
> on the inside of your network may still allow outside DNS recursion.

Efficient Networks DSL routers suffer from this problem if DNS servers are 
defined in the DHCP server config on the router.  It's more of a DNS proxy 
though.  It doesn't do any caching.

  Jon Lewis                   |  I route
  Senior Network Engineer     |  therefore you are
  Atlantic Net                |
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