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grilledcheez_21's avatar
grilledcheez_21
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Aug 05, 2016

Issues with TCP Fragmentation?

Hello,   Implementing a new system here and I seem to be getting issues with handshake failures on the front end of the F5 intermittently (seems to be timing out). The first few transactions fail...
application delivery
BIG-IP
LTM
Mike_Dayton_108's avatar
Mike_Dayton_108
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Aug 05, 2016

You need to find out what the minimum MSS size is for the path. You can try creating a new profile that defaults from tcp-lan-optimized and adjust the MSS to 1400 or 1360.

 

Mike

 

  • grilledcheez_21's avatar
    grilledcheez_21
    Icon for Nimbostratus rankNimbostratus
    Aug 05, 2016

    Seems to be 1460 on the WAN, our server side LAN should be able to handle 1500 no problem.

     

  • Mike_Dayton_108's avatar
    Mike_Dayton_108
    Icon for Nimbostratus rankNimbostratus
    Aug 05, 2016

    I am with Boneyard on this. There are too many variables. If you have different MSS sizes on different sides of the LTM, you may want to enable proxy mss.

     

    Proxy Maximum Segment - Specifies, when checked (enabled), that the system advertises the same maximum segment size (MSS) to the server as that of the client. By default, this setting is disabled.