Cisco 1841 mtu size on FastEthernet

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Jul 2nd, 2008
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Im using a Cisco 1841 where FastEthernet0/0 is the customers LAN, and FastEhternet0/1 is the WAN uplink.

When im trying to set the wan uplink to mtu size 1524 i get the following error: % Interface FastEthernet0/1 does not support user settable mtu.

Is there any way i can get the FastEhternet interface to support higher mtu size than the deafult 1500 ?

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a.alekseev Wed, 07/02/2008 - 04:43
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there is no way.

why do you want to increase mtu?

Leifkaare Wed, 07/02/2008 - 04:53
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The customer needs higher mtu size to allow for logon to some of their server systems

a.alekseev Wed, 07/02/2008 - 05:03
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something is wrong...

1500 is enough...

Paolo Bevilacqua Wed, 07/02/2008 - 14:17
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Alekseev is correct. Your customer has probably a misunderstanding bout the MTU concept in IP networking.


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