In article <199701270743.JAA01157@pyy.jmp.fi>,
	Jukka Marin <jmarin@pyy.jmp.fi> writes:
> I had MTU of 296 bytes on the PPP link on my router machine.

I still have.

> When I changed it to 576, things started working (it seems).

I suppose that there is some kind of network problem between your site
and "mail1.microsoft.com." or a broken TCP/IP implementation on the
MS system which is somehow doesn't show up with larget packets.

> I heard that this is the minimum length specified for IP packets.

No, the minimum length is 40 bytes.

> The reason I was setting MTU so small was to speed up interactive connections
> while there's a file transfer in progress.

I use it for the same reason.

> Why do we have MTU of 296 bytes for SLIP, then? :-o
> 
> Thanks to all who responded.
> 
>   -jm
> 
> 

-- 
Matthias Scheler				http://colwyn.owl.de/~tron/