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Re: Anybody else seeing hotmail connections hanging ?

On Thu, Dec 09, 2004 at 02:27:23PM -0300, Carlos G Mendioroz wrote:
> FYI,
> the problem was some upstream interface with a small MTU (1480) combined 
> with some icmp message filtering and hotmail insisting in using DF 
> (don't fragment) for SMTP, who knows why.
> We are forcing MSS negotiation down to 1440, and so far so good...

Ah,  path-mtu-discovery does that, and all modern systems are using it.

/Matti Aarnio	<mea@nic.funet.fi>
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