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pppoe problem



Hello, I've recently started using a provider that needs pppoe and I'm having
problem configuring my box for it. My debian box acts as a router/firewall for
several other computers on the network. 

It seems to connect fine through pppoe, gets an IP address and DNS servers.
However, only 1 machine on the network can connect to the internet. Other
machines have various problems. For instance, they hit google.com in a second,
but other sites just sit there forever after getting the title, or some other
sites get some info but never finish loading. The machine that does work is the
one that provider's software was originally installed on, so I'm thinking their
software might have changed some ethernet parameters.

I think it might be an mtu blackholing issue but I don't know how to fix it. I
tried to uncomment a line in dsl-provider file that decreases MTU to 1452 or
1412 and it doesn't make any difference. And 'ifconfig ppp0' shows 1492 always.
I've read on ubuntu list that there's some problem in either pppoe or ppp that
doesn't allow setting mtu correctly. I wonder if the same problem since it might
be the same package.

One other piece of info: if I plug my machine into a router that the provider
gave, and let it handle pppoe, everything works fine. That router has MTU set to
1492.

I'd appreciate any help at all. Thanks.




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