How do you tune TCP/IP packet re-transmit timeout
2007-12-25 11:09:00
Daniel Blander =8^)
Sr. Systems Engineer Applied Computer Solutions
His reply .......
/usr/sbin/ndd -set /dev/tcp tcp_deferred_ack_interval
You can use /usr/sbin/ndd /dev/tcp tcp_deferred_ack_interval
to see the current value......
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The solution I used was based on his EM. I created a script in /etc/rc2.d with these entries:
# Alter the tcp/ip re-transmit interval.
/usr/sbin/ndd -set /dev/tcp tcp_deferred_ack_interval 500
/usr/sbin/ndd -set /dev/tcp tcp_rexmit_interval_initial 1500
/usr/sbin/ndd -set /dev/tcp tcp_rexmit_interval_min 600
This has dropped the retransmit rate from more that 25% to arround 3%.
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Original Question.
Could someone tell me:
How to increase the timeout value for TCP/IP re-transmitting packets due to not receiving an "Ack" from the packet destination with in that timeout period.
The situation:
The network is a WAN consisting of 18 LAN's. These LAN's all access one server called "Server-X" via a Router called "Rout-X".
9 of the lans are PC networks & 9 of the lans are PC networks with a local Solaris 2.3 work station. Server-X is running Solaris 2.3.
I am having periods of poor responce times due to congestgion caused I believe by the re-transmitting of IP protocol packets.
What I want to do is increase the timeout on re transmitting packets. In the hope that given a little more time the ACK's will arrive.
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