TCP timeout

[scuba at centroin.com.br]

Hi folks,

 	I'm facing some troubles with mail server on a busy slow link.

 	I'm getting a lot of "sendmail: SYSERR: collect: read timeout on 
connection from" entries in the logs.

 	I found this page showing an workaround for Solaris. Is it 
applicable  for Free BSD 5.4? If positive, is there any sysctl variable to 
tun it?

-----------------xxxxxx-----------------

TCP/IP connections time out too soon, especially on slow links.

The tcp/ip abort interval in Solaris 2.x is too short, the default value 
is 2 minutes. The result is that when an ACK isn't received in 2 minutes, 
the connection is closed. This is most often seen by sendmail, which will 
log

sendmail: SYSERR: collect: read timeout on connection from ...

You can fix this by running following command which increases the timeout 
to 8 minutes (unit is millisec), which is the Solaris 2.4+ (and patched 
2.3) default.

/usr/sbin/ndd -set /dev/tcp tcp_ip_abort_interval 480000

-----------------xxxxxx-----------------


- Marcelo