Name resolution stops working (DSL pppoe)

After working fine for a while, (about 1/2 hour) Firefox (and
Konqueror too) suddenly start popping "server not found" window for
all destinations,

ifconfig, shows PPP all right, but any ping to any of well known
servers like google, yahoo, even my own ISP all come back with
"unknown host".

Back to back ppp-off/ppp-on immediately cures the condition.

What can be missing in my setup?

While the name resoulution is dead, data flow for p2p contnues down
and up o.k.

I tried running a script that sends one-per-minute pings to my
provider, in the hope that it will keep things going, it did not help.
Firefox and Konqueror both had the same problem of not being able to
resolve the names after about 1/2 hour.

/etc/ppp/resolve.conf always has the same data, two lines with two
nameserver IP addresses.

I would appreaciate any ideas on this weird situation.

Thanks in advance

On 2007-10-27, (E-Mail Removed) <(E-Mail Removed)> wrote:
> After working fine for a while, (about 1/2 hour) Firefox (and
> Konqueror too) suddenly start popping "server not found" window for
> all destinations,
>
> ifconfig, shows PPP all right, but any ping to any of well known
> servers like google, yahoo, even my own ISP all come back with
> "unknown host".
>
> Back to back ppp-off/ppp-on immediately cures the condition.
>
> What can be missing in my setup?
>
> While the name resoulution is dead, data flow for p2p contnues down
> and up o.k.
>
> I tried running a script that sends one-per-minute pings to my
> provider, in the hope that it will keep things going, it did not help.
> Firefox and Konqueror both had the same problem of not being able to
> resolve the names after about 1/2 hour.
>
> /etc/ppp/resolve.conf always has the same data, two lines with two
> nameserver IP addresses.
>
What about /etc/resolv.conf? It's possible your DSL modem is also a DHCP
server, and the DHCP info could be overwriting the PPP nameservers. If eth0 is
the interface connected to the DSL, does it have an IPv4 address?

> I would appreaciate any ideas on this weird situation.
>
> Thanks in advance
>

On Oct 27, 11:03 pm, Bill Marcum <marcumb...@bellsouth.net> wrote:
> What about /etc/resolv.conf? It's possible your DSL modem is also a DHCP
> server, and the DHCP info could be overwriting the PPP nameservers. If eth0 is
> the interface connected to the DSL, does it have an IPv4 address?

Yes, after some more personal investigation, I did check that one,
and there lies the problem.

Some periodical DHCP action overwriting that file, and losing good
nameserver lines, replacing them with two lines: "search lan", and
"nameserver 10.x.y.z".

I made /etc/resolv.conf immutable, as a work around, and filed a bug
report against Ubuntu Gutsy.