Hi
for those who are experiencing so called "hanged" calls, here is how to
control it by means of TcpKeepalive setting of gnugk. This is true for
FreeBSD versions 4.8 an up and 5.4 and Gnugk 2.2.1 and up.
Here are correct sysctl MIBs and their meanings:
net.inet.tcp.keepidle - Amount of time, in milliseconds, that the (tcp)
connection must be idle before keepalive probes (if enabled) are sent.
net.inet.tcp.keepintvl - The interval, in milliseconds, between
keepalive probes sent to remote machines. After TCPTV_KEEPCNT (default
8) probes are sent, with no response, the (tcp)connection is dropped.
net.inet.tcp.always_keepalive - Assume that SO_KEEPALIVE is set on all
TCP connections, the kernel will periodically send a packet to the
remote host to verify the connection is still up.
therefore formula to calculate maximum TCP inactive connection time is
following:
net.inet.tcp.keepidle + (net.inet.tcp.keepintvl x 8)
the result is in milliseconds.
therefore, by setting
net.inet.tcp.keepidle = 10000
net.inet.tcp.keepintvl = 5000
net.inet.tcp.always_keepalive =1 (must be 1 always)
the system will disconnect a call when TCP connection is dead for:
10000 + (5000 x 8) = 50000 msec (50 sec)
To make system remember these settings at startup, you should add them
to /etc/sysctl.conf file
Calls disconnected due to TCP keepalive issue will be logged with
disconnect cause 6F in the Radius.
regards
Aivis
-------------------------------------------------------
SF.Net email is Sponsored by the Better Software Conference & EXPO
September 19-22, 2005 * San Francisco, CA * Development Lifecycle Practices
Agile & Plan-Driven Development * Managing Projects & Teams * Testing & QA
Security * Process Improvement & Measurement * http://www.sqe.com/bsce5sf
_______________________________________________________
Posting: mailto:Openh323gk-users@xxxxxxxxxxxxxxxxxxxxx
Archive: http://sourceforge.net/mailarchive/forum.php?forum_id=8549
Unsubscribe: http://lists.sourceforge.net/lists/listinfo/openh323gk-users
Homepage: http://www.gnugk.org/
