jumbo frames issue (9000 bytes MTU)

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jumbo frames issue (9000 bytes MTU)

jumbo frames issue (9000 bytes MTU)

2005-07-28 - By Tim Miller

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Reply: 1 2 3 4 5 6 7 8 9

I don't know about Dell's network switches, but other switches require
you to actually configure the mtu suze on the specific ports you want to
jumbo frame.

-- --Original Message-- --
From: wolf2k5 <wolf2k5@(protected)>
Date: Thu, 28 Jul 2005 11:29:56
To:"Discussion of Red Hat Enterprise Linux 3 (Taroon)" <taroon-list@(protected)>
, Linux-PowerEdge@(protected)
Subject: jumbo frames issue (9000 bytes MTU)

Hi,

I enabled jumbo frames (9000 bytes MTU) on two Dell PowerEdge 1850
servers running Red Hat Enterprise Linux 3 ES Update 5 x86_64 using
the following commands:

ifconfig eth1 mtu 9000
service network restart

After the MTU change, I was able to transfer (scp) very small files
between the servers, ping also worked fine, but when trying to
transfer bigger files, the copy process got stuck.
Also, the NFS mounts didn't work anymore.

I reverted the MTU change and all got back to work as before.

The switch is a Dell PowerConnect 5324 and it should support jumbo
frames just fine.

Do you have any idea about the cause of the issue?

Should I reboot the server instead of just restarting the network service?

Thanks.

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Timothy E Miller, PhD, RHCE
Wake Forest University
V: 336-758-3257
C: 336-782-6987

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