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Re: [partly OT]: in-between ISPs - solved



Hi!
To clarify:


On 7 Aug 2001, Oleg Goldshmidt wrote:

>
> Thanks to Nadav, and later Dani Arbel, tweaking my MTU value
> seems to have solved my POP3 problem.
>
> Nadav, coming back to your question about ftp/http, the only odd thing
> I can recall now was that I could not connect to www.theregister.co.uk
> until I changed the MTU. Whether or not it was a coincidence I do not
> know.
All the "odities" are caused by misunderstanding the root of the problem:
it is in the specific server, and the ISP network. The effect is
blackholing the server. Now whatever service this server is giving you,
that will be the service you feel the connection freeze. The problem is in
the server side, not the client. We can bypass this by changing the MTU of
the client to the actual path MTU. This causes the client to advertise,
during the tcp connection setup, MSS that fits the path MTU , and then the
server never becomes black hole.
Dani



>
> --
> Oleg Goldshmidt | ogoldshmidt@NOSPAM.computer.org
> "I'd rather write programs to write programs than write programs."
>
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