[plug] Problem with gethostbyname

[Craig Ringer]

>>Seems like it is failing on a reverse DNS lookup.  Does the machine
>>really exist in Bigponds DNS.  It doesn't seem to resolve to anything
>>here.
> 
> 
> [leonb at leon leonb]$ host -v CPE-144-137-234-225.wa.bigpond.net.au

<snip successful reverse and forward lookups>

When I was on BigPond cable (briefly, before being badly screwed by 
telstra) I found that the DNS servers that their DHCP server assigns you 
are _not_ the DNS servers the rest of the world sees. It is quite likely 
to be the same for dialup. I had all sorts of fun with addrs that 
weren't in Telstra's local DNS but only in the world-accessable one and 
vice versa.

This was particularly common with reverse lookup addrs - I had a problem 
where the reverse lookup worked but looking up the resulting FQDN to 
verify the IP/name match would fail. I don't remember if I ever fixed it 
but I do seem to remember it was related to the weird DNS setup telstra 
has on cable.

-- 
Craig Ringer
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