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



Dani Arbel <darbel@techunix.technion.ac.il> writes:

> 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.

Let me understand this: you are saying that the root of the problem is
barak (whose ADSL service we are using here). They do not allow
packets of more that 1452 (or whatever) bytes through. To overcome the
problem, the server (e.g. the Netvision POP3 server, or theregister
web server) and the client (my computer) need to negotiate an MTU less
than the Barak's limit. Since the server can't be expected to choose
an MTU that will satisfied all the quirks of every connection, I have
to choose an MTU that will satisfy Barak.

Is my understanding correct?

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

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