Re: How do I alter values for TCP timeouts (SRTT & RTO)

Not positive, but I believe you'll discover that lbound & ubound are set in the source code of whatever TCP you're using, and resetting would involve a recompile of that module. Not highlevel stuff, likely not in registry.

Further I believe the max (ubound) setting is dynamically adjusted according to ongoing retransmit durations, and in most implementations can exceed your 35 second ping by close to a minute and a half.

Is it possible your radio link is occasionally completely blocked for periods exceedingf a few hundred seconds? Jammed? Hdw/sftw glitch?

As I say, cum grano salis etc.

hotdogdave wrote: 
Hi

Can anyone please help?! : )

I am working with a Win2000 IP network over a HF radio system with high latencies (ping = 35 secs). Putting the jokes aside of 'why bother'!, we occasionally get a TCP timeout occurring. I know this is because the reply takes longer than the TcpTimeout setting. The MS info on this is at

http://www.microsoft.com/resources/documentation/Windows/2000/server/reskit/en-us/Default.asp?url=/resources/documentation/Windows/2000/server/reskit/en-us/regentry/58802.asp

I have changed the TcpInitialRtt value in the registry but this is an initial value to start the Smoothed RTT (SRTT) which is then dynamically calculated using a given formula discussed in 

http://www.informit.com/articles/article.asp?p=130716&seqNum=4&rl=1

SRTT is calculated by values such as [alp], [beta]. Retransmit TimeOut (RTO) is then calculated from SRTT and also has values such as upper and lower bounds (UBOUND, LBOUND). I have done a lot of searching and can find lots of information on what I have discussed above, but nothing about where I can set the values above. The articles indicate that these values may be altered. I assume these are set in the registry, like TcpInitialRTT, but I cant find out where.

cheers David
sunny England


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