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steelplate_8766's avatar
steelplate_8766
Icon for Nimbostratus rankNimbostratus
Jun 16, 2010

retransmission interval for SYN

Is it possible to set this ? I saw a server behind sNAT take 4.5 seconds to respond to a SYN because it was busy. before sNAT the windows client would have silently handled this. with sNat the f5 resets the user connection as it's 3 SYN retries seem to be 250ms apart 
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TcpMaxConnectRetransmissions
Key: Tcpip\Parameters
Value Type: REG_DWORD - Number
Valid Range: 0 - 0xFFFFFFFF
Default: 2
Description: This parameter determines the number of times that TCP retransmits a connect request (SYN) before aborting the attempt. The retransmission timeout is doubled with each successive retransmission in a particular connect attempt. The initial timeout value is three seconds.
config
design

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  • steelplate_8766's avatar
    steelplate_8766
    Icon for Nimbostratus rankNimbostratus
    Jun 17, 2010
    ok, it's not possible , and in my case it's a bug

     

     

    SOL11073: Change in Behavior: The minimum TCP retransmission timeout was changed in BIG-IP version 10.1.0.

     

     

    and is fixed in Hotfix-BIGIP-10.1.0-3372.0-HF1 , though it will still be shorter than windows on 3 retries