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тАО11-12-2008 04:12 AM
тАО11-12-2008 04:12 AM
SET
PROTOCOL
/PROBE_TIMER
/PROBE_TIMER=n
Optional. Default: 75 seconds.
UCX> show proto tcp /para
TCP
MTU size segment: disabled
Delay ACK: enabled
Loopback: disabled
Window scale: enabled
Drop timer: 600
Probe timer: 75
From a system with post 5.4 TCPIP:
SET
PROTOCOL
/PROBE_TIMER
/PROBE_TIMER=n
Optional. Default: 75 seconds.
TCPIP> show prot tcp /para
TCP
Delay ACK: enabled
Window scale: enabled
Drop count: 8
Probe timer: 7200
The online documentation (probe timer 75 seconds) differs from the reality (probe timer 7200 seconds).
I found the following in the web:
http://tech.groups.yahoo.com/group/OpenVMS_Friends/message/1818 :
"there was a change to connection timeouts in 5.3, where the default
was changed from 75 seconds to 2 hours to make it RFC compliant."
Does that come from here:
From RFC 1537: http://graphcomp.com/info/rfc/rfc1537.html
For top level domain servers I would recommend the following values:
86400 ; Refresh 24 hours
7200 ; Retry 2 hours
2592000 ; Expire 30 days
345600 ; Minimum TTL 4 days
For other servers I would suggest:
28800 ; Refresh 8 hours
7200 ; Retry 2 hours
604800 ; Expire 7 days
86400 ; Minimum TTL 1 day
This change is not reflected in any TCPIP manual. There is some description about the KEEPALIVE values in the тАЬHP TCP/IP Services for OpenVMS Sockets API and System Services ProgrammingтАЬ manual. But even there they are saying that TCP_KEEPIDLE is 75 seconds (150 half-seconds), whereas each OpenVMS machine in our clusters are showing that
TCPIP> sysconfig -q inet
returns
tcp_keepidle = 14400
(Again, half-seconds, so these are 7200 seconds).
Am I misunderstanding here anything? Or is this a TCPIP on OpenVMS documentation bug?
Wolfgang
Solved! Go to Solution.
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тАО11-12-2008 05:03 AM
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тАО11-12-2008 05:08 AM
тАО11-12-2008 05:08 AM
Re: PROBE_TIMER default
This memo provides information for the Internet community. It does not specify an Internet standard.
So, HP decided that some part was a good idea and implemented it. But forgot to modify the online help.
fwiw
Wim
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тАО11-12-2008 05:30 AM
тАО11-12-2008 05:30 AM
Re: PROBE_TIMER default
"4.2.3.6 TCP Keep-Alives
...Keep-alive packets MUST only be sent when no data or acknowledgement packets have been received for the connection within an interval. This interval MUST be configurable and MUST default to no less than two hours."
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тАО11-12-2008 05:40 AM
тАО11-12-2008 05:40 AM
Re: PROBE_TIMER default
We have the timeout in minutes to get alarms in time when things go wrong. Note that some protocols allow overrule of the default within the program (via logicals : ftp , ftpd, telnetsym, ... ).
Wim
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тАО11-12-2008 06:12 AM
тАО11-12-2008 06:12 AM
Re: PROBE_TIMER default
I used the feedback button for reporting documentation issues to HP, as suggested. If I receive a response in the near future I'll post it here.
Wolfgang