In message <20010516231623.A590@antioche.eu.org>, Manuel Bouyer writes:
>On Wed, May 16, 2001 at 06:19:02PM +0100, Georges Heinesch wrote:
>> Hi.
>> 
>> The usepeerdns option queries the remote peer during dialup if there
>> are any DNS servers. Until now, I thought, that if the remote peer
>> gives out the DNS servers, that those are used automatically.
>> 
>> Tests revealed that this is apparantly not the case. The problem comes
>> when using multiple providers.
>> 
>> How can I tell pppd to use the DNS Servers which are negiciated during
>> initial dialup (provided the peer gives out the DNS servers, which is
>> not always the case)?
>
>Not easy;I don't think our pppd can get this info.
>However; I use xisp as front-end to pppd, and it can automatically add/remove
>entries from /etc/resolv.conf, based on the isp you're using.

The man page (on 1.5.1beta1) says that it should automatically do the 
right thing, but it hasn't worked for me in my (very limited) tests:

	usepeerdns
              Ask the peer for up to 2 DNS server addresses.  The
              addresses supplied by the peer (if any) are  passed
              to  the  /etc/ppp/ip-up  script  in the environment
              variables DNS1 and DNS2.  In  addition,  pppd  will
              create  an /etc/ppp/resolv.conf file containing one
              or two nameserver lines with the  address(es)  sup-
              plied by the peer.



		--Steve Bellovin, http://www.research.att.com/~smb