not sure I really understand the problem but it looks as though
you didn't get a dns= record in /net/ndb (with the new ipconfig).
If this is all it is then you should be able to just do:
echo ' dns=1.2.3.4' >> /net/ndb
where 1.2.3.4 is your DNS server's address.
I am pretty sure this will work, though I haven't
tried it since the days I used ppp and dialup...
you will also need to get dns to reread its config:
echo refresh > /net/dns
----------
You could also check that ip/cs is able to
find a dns server for your machine:
ndb/ipquery sys $sysname dns
and try repeating this using
ndb/ipquery ip 1.2.3.4 dns
where 1.2.3.4 is your IP address
-Steve