Andrew, 

> eth0, 
> ipv4 62.232.4.232, 
> ipv6 fe80::260:8ff:fe4e:e594/10 link
> 
> eth1,
> no ipv4,
> ipv6 fe80::260:8ff:fe4e:e5c8/10 link
> ipv6 2001:618:400:f045::/64 Global
> 
> sit0
> fe80::3ee8:4e8/10 Link
> 2001:618:400::3ee8:4e8/128 Global
> 
> 
> The eth0 fe80 is the link local address for this physical 
> network, /10 
> seems a large allocation?
> Same for eth1.

This is standard. See RFC2373.
 
> On eth1, the 2001:618 address is the /64 subnet for the 
> allocation I have 
> via the tunnel, I am curious it ends in :: beacuse I would 
> have thought 
> this was the ipv6 equivalent of the broadcast address. If it 
> is, do I need 
> to put a host address on somehow?

IPv6 doesn't have broadcast addresses. Using :: is OK. Also, if you use
stateless address autoconfiguration, the lower 64 bits of the address
(the interface ID) will get populated automatically.
 
> On sit0, I have a 2001...../128, I asume this is the host 
> address for the 
> end of the tunnel.

Yup.

> Turning to dns, the tunnel endpoint runs a dns service with 
> BIND 9.1x, I 
> have added a AAAA address for phobos6.mediahub.co.uk to be the 
> 2001:.../128 endpoint address. If I use nslookup and do a set 
> type=AAAA, 
> it returns the correct answer, same for the CNAME www6, but 
> if I just do 
> nslookup phobos6.etc from the command line I am unable to resolve 
> anything.

I would use an address from your /64 subnet allocation as the address
you publish in DNS.

HTH,

Mat

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