MTU on PIX for DSL

Answered Question
Feb 5th, 2009
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Hi all,


I have a PIX where the outside interface is connected to a DSL modem. The PIX is configured for PPPoE on the outside interface. I know that the typical MTU size is 1500 for Ethernet and 1492 for PPPoE.


Should I set the MTU to 1492 on the outside interface of the PIX, or does the MTU only need to be set properly on the DSL modem?


Any help is very much appreciated.


Thanks,

- Steve

Correct Answer by celiocarreto about 8 years 5 months ago

Hi,


I implemented a lot of ASA with DSL and never changed the MTU size on ASA. Only on routers (1492).

Currently no complains received.


Regards, Celio

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Correct Answer
celiocarreto Fri, 02/06/2009 - 01:30
User Badges:

Hi,


I implemented a lot of ASA with DSL and never changed the MTU size on ASA. Only on routers (1492).

Currently no complains received.


Regards, Celio

rstevek Fri, 02/06/2009 - 10:52
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Hi Celio,


Thanks for the reply. I found out that, when you use the ip pppoe setroute command, the MTU for that route is automatically set to 1492.


Thanks,

- Steve



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