H.323 debug messages

[zeeshan06]

hi,

i want to know the description of following debug messages

h323_gw_sock_block_timer_expried: fd 2

h323_gw_start_sock_blocked_timer: fd 2

h323_gw_sock_block_timer_expried: retry

Timer[CCH323_SOCK_WRITE_BLOCKED_TIMER] expired

Regards,

Ali

[gogasca]

Hi Ali,

Those messages means normally that at some H323 stack level or upper layers communication is not being completed.

Are you doing any NAT / Firewall / VPN in your network that might potentially cause block of TCP packets?

What is your current topology, detailed problem and IOS versions?

As a note Cisco router fragments any packet that has an MSS (Maximum Segment Size) of more than 536.

Although at this time is hard to say this in some cases with similar errors as you the workaround was to use the command "ip tcp path-mtu-discovery" on the gateways.

This command would enable the router to increase the MSS to higher value after sending a MTU discovery packet which would determine the maximum MSS that can be sent on the link.

HTH

//G

[zeeshan06]

hi gogasca,

i am not using either of NAT/Firewall/VPN.

when i enable the debug of h.323 then for both successful and unsuccessful calls i get above mentioned messges.Currently i am using Version 12.3(15).

should i use comamnd "ip tcp path-mtu-discovery" in Global configuration mode?

anxiously waiting for the reply.

Regards,

Ali