ppp.conf + resolv.conf

[Tom Evans]

On Sun, 2007-05-06 at 18:32 +0100, Matthew Seaman wrote:
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> JD Bronson wrote:
> > I am using 6.2 as a DSL (PPPoE) router and also run my own internal DNS
> > on the same machine. I would like to APPEND my ISP's dished out DNS
> > servers to my current resolv.conf but anytime I enable dns in my
> > ppp.conf it nukes my entire resolv.conf....!
> > 
> > I am looking to end up with this:
> > 
> > % cat /etc/resolv.conf
> > domain mydomain
> > nameserver 192.168.1.1
> > nameserver ISP's DNS
> > nameserver ISP's DNS
> > 
> > 
> > How do I do this and still retain my own entries in resolv.conf?
> > If I was using DHCPclient, I could edit dhclient.conf of course but
> > PPPoE does not consult this file during negotiation that I am aware of.
> > 
> > Any comments will be appreciated...
> 
> As you say, PPP doesn't let you append extra servers to what it receives
> automatically.  Your best recourse then is to find out the IP numbers
> of your ISPs DNS machines -- either by consulting the ISP's documentation
> or web site, by asking their support team or by looking at the results
> obtained by running PPP with 'enable dns'.
> 
> Then make sure your ppp.conf does not overwrite your /etc/resolv.conf on
> connection, and just edit resolv.conf to insert the IP numbers you've
> discovered.  A static resolv.conf will serve you well enough. After all,
> it's not like your ISP will be changing their DNS servers every few hours.
> 
> 	Cheers,
> 
> 	Matthew
> 
> - -- 
> Dr Matthew J Seaman MA, D.Phil.                       7 Priory Courtyard
>                                                       Flat 3
> PGP: http://www.infracaninophile.co.uk/pgpkey         Ramsgate
>                                                       Kent, CT11 9PW
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Not actually tested this, ip-up might be a little early for this

$ cat > /etc/ppp/ppp-linkup
#!/bin/sh
(
	/bin/echo -e "domain foo\nnameserver 192.168.1.1\n"; 
	/usr/bin/grep nameserver /etc/resolv.conf
) > /tmp/resolv.conf
/bin/mv /tmp/resolv.conf /etc/resolv.conf
^D
$ chmod +x /etc/ppp/ppp.linkup

Or add "resolv readonly" to your ppp.conf, and maintain your resolv.conf
yourself.
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