UDP tuning and monitoring

[Ken Englander]

Does anyone have recommendations for values for udp_recvspace and udp_sendspace, in particular for Oracle CRS?

Also, any hints on monitoring UDP. Is there a way to see packet counters for a specific interface rather than for all of TCP/IP?

Any suggestions would be great! Thanks.

[Hoff]

Try a few Google searches for some discussions, or check with the nice folks over at Oracle?

Google kicks over a few similar discussions, based on some keyword searches -- though none exactly specific to OpenVMS. (I'd expect to find these recommendations from Oracle.)

I tend to use out-board monitors for network traffic analysis. Check snort or such. Most of these tools can be configured on most any handy Windows, Linux or Mac OS X box, and for little or no money, and will provide you with details of what your network is doing.

This also avoids loading stuff onto the server.

Stephen Hoffman
HoffmanLabs

[Robert Gezelter]

Ken,

I agree with Hoff, an outboard monitor is the correct way to go, as a starting point. Always to science.

Ethereal (now WireShark) is available as freeware and quite usable (see http://www.wireshark.org ). I would isolate the traffic that is relevant and make sure that I do reliable experiments. Be careful of other devices in the path, they will likely have a significant impact.

- Bob Gezelter, http://www.rlgsc.com

[Ken Englander]

I was hoping maybe there was something that might rerquire a bit less effort.

I neglected to mention this is on a VMS system, so that definitely seems to mean Wireshark would be running on another server.

[Wim Van den Wyngaert]

ucx show prot udp gives you some info.

Wim

[Ken Englander]

The priority of this task has been changed to push it to the back burner. Thanks for the information that you shared!