Kbase P75775: How to Configure the keepalive Parameters on HP-UX 11
| Autor |
Progress Software Corporation - Progress |
| Acesso |
Público |
| Publicação |
11/11/2008 |
|
Status: Verified
GOAL:
How to Configure the keepalive Parameters on HP-UX 11
FACT(s) (Environment):
HP-UX 11
Progress/OpenEdge Product Family
FIX:
The algorithm of sending TCP keepalive packets has been changed between HPUX 10 and HPUX 11 (RFC 1122 - Requirements for Internet Hosts - Communication Layers)
The relevant parameters are:
tcp_keepalive_interval - Interval for sending keepalive probes
tcp_ip_notify_interval - R1 for established connection
tcp_ip_abort_interval - R2 for established connection
The parameter tcp_keepalive_interval determines the amount of time that TCP waits for an idle connection with no unacknowledged data before sending keepalive packets.
The default is 7200000 ms = 2 hours.
Then send keepalive packets: tcp_ip_notify_interval (R1)
Default 10000 ms = 10 seconds
UNTIL: tcp_ip_abort_interval (R2)
Default 600000 ms = 10 minutes
is reached (which is the time that a modem would normally need to re-call for example)
In other words, the keepalive packets are sent R2/R1 times (in HPUX 10 this was the tcp_keepstop parameter) which with the default settings, would mean terminate the idle connection in 2 hours 10 minutes.
nettune is obsolete functionality in HPUX 11 and has been included instead in the ndd utility for examining and modifying system-wide transport parameters.
for example:
ndd -set [network] [device] [parameter] [value]
ndd -set /dev/tcp tcp_keepalive_interval 900000
Please use ndd -h <timer_name> for more information.
Progress does not have specific recommendations - the tcp_keepalive_interval should be set to as long as you would consider an inactive connection to be valid for. These changes will affect all connections, not just Progress ones.