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

.

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