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Conference 7.286::fddi

Title:FDDI - The Next Generation
Moderator:NETCAD::STEFANI
Created:Thu Apr 27 1989
Last Modified:Thu Jun 05 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:2259
Total number of notes:8590

136.0. "FDDI/Ultrix windows???" by DENVER::SANDOVAL () Thu Sep 13 1990 17:50

    Question:
    
    		I need to know how to increase the TCP_WINDOW size from
    		it's current 4096 to 24k and also up the maximum segment
    		size (TCP_MSS) from 1024 to 4k..FDDI related.
    
    Thanks Anyone
    
    eric()
T.RTitleUserPersonal
Name		DateLines
136.1KONING::KONINGNI1D @FN42eqThu Sep 13 1990 18:565
    As far as I know at least the MSS part will be taken care of once FDDI
    adapter support shows up in Ultrix.  It doesn't have any relevance
    until then.
    
    	paul
136.212345::thomasThe Code WarriorThu Sep 13 1990 19:274
ULTRIX will automaticly up the MSS to 4K if you're on FDDI.
Use the SO_SNDBUF and SO_RCVBUF setsockopts to increase the buffer
space for your program.  This somewhat directly translates into the
offered window size.
136.3RE: segment sizeDENVER::SANDOVALFri Sep 14 1990 12:119
    Follow up on my first question:
    
    		I would like to bump up the maximum segment size
    		(TCP_MSS) from 1024 to 4k, because I would like to 
    		test out the fragmentation between ether and FDDI.
    
    	Thanks anyone
    
    	eric()
136.4Why bother?KONING::KONINGNI1D @FN42eqFri Sep 14 1990 12:355
If you're doing that on the Ethernet nodes, you're actually testing 
fragmentation in the sender.  I suppose it could be amusing to do that,
but that's ancient code -- why spend the time?

	paul