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uk.comp.home-networking (UK home networking) (uk.comp.home-networking) Discussion of all aspects of computer networking in the home, regardless of the platforms, software, topologies and protocols used. Examples of topics include recommendations for hardware or suppliers (e.g. NICs and cabling), protocols, servers, and specific network software. Advertising is not allowed.

Strange MTU Problem

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Old May 24th 08, 11:04 AM posted to comp.os.linux.networking,uk.comp.home-networking
Geoff Lane
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Default Strange MTU Problem

I run a small home network with two older Linux machines and an XP laptop.

Recently I ran a Windows network analysis tool and after testing various
URLs it reported my best MTU to be 1500, as this is the default for ADSL
I thought nothing of it and set my router to 1500 (It had been 1472).

Everything appeared to be fine, web surfing OK, receiving mail OK but
had a problem sending emails with attachments; also there was one web
site that I couldn't access on my windows or Linux machines.

As the only thing I recalled altering was the MTU changed it back to
1472 and now all fine.

I know the default is 1500 also for the Linux machines so is this a
common problem with incorrect MTUs that most will work OK but some areas
of the network may not.

Geoff Lane

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