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Recommened MSS Value Setting

Posted on 2009-07-05
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1,227 Views
Last Modified: 2012-05-07
I would like to know the recommened MSS value settings in Cisco ASA 5510.
I am using Cisco ASA 5510 to connect to internet & NATing is enabled to it.

I am getting the following alerts in the Cisco ASA. Default MSS is configured in the Cisco ASA

%ASA-4-419001: Dropping TCP packet from outside:1.1.1.1/80 to inside:2.2.2.2/59924, reason: MSS exceeded, MSS 1380, data 1460

Would like to know what is the recommended MSS settings to be configured so that the packets are not rejected.

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Question by:SrikantRajeev
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Expert Comment

by:uucknaaa
ID: 24779256
Hi

Here's a Cisco document that explains the problem and has a workaround:

http://www.cisco.com/en/US/products/hw/vpndevc/ps2030/products_tech_note09186a00804c8b9f.shtml

I'm checking a couple of other solutions.  I'll be back.
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Expert Comment

by:uucknaaa
ID: 24779266
And ..

I've been reading this:

http://www.cisco.com/en/US/tech/tk870/tk877/tk880/technologies_tech_note09186a008011a218.shtml

and am wondering if the parameter needs to be adjusted in Windows?  

Check it out and see what you think?
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Accepted Solution

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uucknaaa earned 500 total points
ID: 24779295
Hi

It looks like the recommended size is 1452.  There is an explanation in the usage guidelines for the command in this doc:

http://www.cisco.com/en/US/docs/ios/12_3/wan/command/reference/wan_i1g.html

Hope this all helps the problem you are seeing.
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Author Closing Comment

by:SrikantRajeev
ID: 31599889
Thanks
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