[dns-operations] Lots of queries for TXT records?

[Ray.Bellis at nominet.org.uk]

> I asked one of our DSL guys to dig a little, and he found that the Zoom
> X5 DSL (and I believe X6 DSL router with wireless) router will listen on
> the WAN interface for DNS requests by default _if_ they have DNS servers
> configured or receive them as part of PPP negotiation.
> 
> There is an option to turn this off under the advanced settings.

Fortunately this behaviour doesn't seem to be particularly widespread.

When we tested 24 units for SAC035 we only found (AFAICR) one unit which 
responded to DNS requests on the WAN port by default.  We didn't test any 
Zoom units, though.

Ray
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