Re: ISDN and Invalid fcs

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#303

From: Faye Pearson
Date: Sun, 09 Mar 1997 00:00

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On 08 Mar 1997 11:13 +0000, Niel Kempson <kempson@snowyowl.co.uk> wrote:
> If you are working only on a local network, you can wind up the MTU/MRU to
> reduce overheads and increase performance.  However, if you traffic has
> to go through routers, your packets will be fragmented if they exceed
> the MRU settings used by the routers, reducing performance.
> 
> If I recall correctly, most of the routers use an MRU of 576, and
> Ethernets use 1500.  If you're generally connecting to non-Demon hosts,
> the "Tuning FAQ" recommends an MRU of 576 to avoid fragmentation.  For a
> more detailed discussion, see ftp.demon.co.uk:/pu/doc/ka9q/Tuning.faq.

I've just realised you have confused MTU with MRU.

MTU should be restricted in the method that you suggest, but MRU is the
*Maximum* receive unit which doesn't affect packets from you but packets TO
you.  Setting it high definitely improves performance here.

-- 
Faye Pearson, faye@os2-warp.demon.co.uk

Are you Minbari or are you just pleased to see me?

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From: faye@emarkt.com (Faye Pearson)
Subject: Re: ISDN and Invalid fcs
Date: 1997/03/09
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