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smp_86112's avatar
smp_86112
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Nov 04, 2008

Maximum Segment Size

I've got an HTTP Virtual Server fronting a web server, which fronts a back-end application server. Clients connecting to the HTTP virtual server advertise a MSS of 1380. The LTM advertises a MSS of 14...
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smp_86112's avatar
smp_86112
Icon for Cirrostratus rankCirrostratus
Nov 04, 2008
I tinkered around a bit with the profile options. I found that by enabling "Proxy Maximum Segment Size" on the external side of the connection, the packets sent from the LTM to the client were full - 1380 bytes. This is with Nagle's algorithm disabled, and was my desired effect.

 

 

I took tcpdumps on both sides of the LTM. The Proxy MMS setting resulted in the LTM informing the webserver that the MSS was 1380 - matching the client. But to my surprise, the webserver seems to be sending full-sized 1380 byte segments, instead of splitting them into one full and one small segment like the LTM does.

 

 

Not sure I understand why, but this setting seems to have done the trick.