SUMMARY: SunOS 4.1.x: How can I change default tcp/ip params.? (tcp_keepalive)

From: Vitaly Beliaev (vit@mmk.ru)
Date: Tue Jan 13 1998 - 03:32:20 CST

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Hello wizards!

Sorry for such long delay in writing the SUMMARY. The company I am
working at has been disconnected from provider for three weeks. So
I had to look through voluminous documentation and find appropriate
solution.

The only reply I have received was from Stefan Voss <s.voss@terradata.de>

--
He advised to look and edit file /sys/netinet/in_proto.c. There you find the
following parameters:
   tcp_sendspace
   tcp_recvspace
   tcp_default_mss
   tcp_ttl
   and some others.
   
After modifying this file, you have to build a new kernel and reboot the 
machine.
--
I manage Solbourne 700,900 servers running SunOS 4.1.2. And I found that
TCP parameters have to be specified in /usr/kvm/sys/netinet/in_proto.c, so
perhaps you will wish to make its original copy prior to editing one. The
following TCP parameters could be set here:
tcp_keeplen (1)
tcp_keepidle    = 2-20   (14400 1/2sec)
tcp_keepintvl   = 2-20   (150 1/2sec)
tcp_ttl         = 30     (60 sec)
tcp_sendspace   = 65535  (4096*4)
tcp_recvspace   = 65535  (4096*4)
tcp_default_mss = 2048   (512 bytes)
After building the kernel you can always see the values in running system.
Regards,
Vitaly Beliaev
-=========================================================================-
 Vitaly Beliaev: Unix systems administrator
 JVSC MMK, RUSSIA
 e-mail: vit@mmk.ru
 voice: +7 (3511) 335639
 if vegetarian prefers vegetables, then what's the snack for humanitarian?
-=========================================================================-

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