hi michal,
sorry for the late answer ...
yes, i had tcpdump'ed the connection, and everything seemed to be ok,
but a comparison of the 2 traces shows that the tcp port range
allocation is different:
with the 2.6.11 kernel, which doesn't work, the source tcp port
allocated when opening the socket to the public gatekeeper is in a
range just after 1024
with 2.6.10, which works, the tcp ports allocated are greater than
32000 (not sure if that's exactly this limit though)
on the working setup, if i force Q931PortRange to something like
1024-2000, calls won't be established with exactly the same problem as
with 2.6.11
the next logical step was to try to force Q931PortRange to something
like 32000-64000 on 2.6.11; oddly enough, it works randomly, eg. after
a gnugk reload, but not after a gnugk restart or a machine reboot;
i'll try to get more time to provide something reproducible...
however it's still unclear why the socket can't be opened with "low"
ports ; i've tried to remove selinux from the kernel, preventing any
netfilter/iptables modules from loading, etc., but with no luck
ivan
On 4/20/05, Zygmuntowicz Michal <m.zygmuntowicz@xxxxxxx> wrote:
> Try to run tcpdump/ethereal to see WHY the connection is not
> accepted (is TCP SYN packet sent at all?). Maybe the problem
> is due to an incorrect network interface being selected.
>
> ----- Original Message -----
> From: "ivan mitev" <ivan.mitev@xxxxxxxxx>
> Sent: Tuesday, April 19, 2005 4:06 PM
>
> sorry if that's not the right place to ask ; this post could belong to
> both pwlib and kernel mailing-lists :(
>
> after an upgrade from kernel 2.6.10 to 2.6.11, gnugk doesn't work
> anymore in proxy mode : calls from an internal host to an external
> gateway are terminated at the time when the rtp traffic usually begins
> to be sent (at least i think so, based on the logs)
>
> all other network things on the machine -
> daemons,routing,netfilter,... - work well
>
> the strange thing is that compiling the kernel with CONFIG_DEBUG_INFO
> makes thing work again, so this could be a timing/thread issue, the
> kernel with debug info being slower.
>
> another thing that is puzzling me is that sometimes - but very rarely
> - gnugk opens the socket successfuly, so that also makes me wondering
> if something hasn't changed between 2.6.10 and 2.6.11 regarding random
> port selection
>
> tested kernels that work without debug: 2.6.10, 2.6.10-ac9
> tested kernels that work only with debug : 2.6.11, 2.6.11.6, 2.6.12-rc2-mm1
>
> all the stable and cvs versions of pwlib/openh323/gnugk show the same behavior.
>
> log excerpt:
>
> admissionConfirm {} [...]
>
> ProxyChannel.cxx(722) Q931s Received: Setup CRV=19932 from 192.168.20.10:1037
> gkacct.cxx(958) GKACCT Successfully logged event 1 for call no. 5
> ProxyChannel.cxx(1690) GK Call 5 is NAT type 0
> ProxyChannel.cxx(609) GK Call 5 proxy enabled
> ProxyChannel.cxx(2173) Q931 Connect to [pub_gk_ip]:1720 successful
> ProxyChannel.cxx(722) Q931d Received: CallProceeding CRV=19932 from
> [pub_gk_ip]:1720
> yasocket.cxx(528) H245d Delete socket [pub_gk_ip]:1077
> yasocket.cxx(528) H245s Delete socket 192.168.20.10:1036
> ProxyChannel.cxx(722) Q931d Received: Alerting CRV=19932 from [pub_gk_ip]:1720
> ProxyChannel.cxx(722) Q931d Received: Connect CRV=19932 from [pub_gk_ip]:1720
> gkacct.cxx(958) GKACCT Successfully logged event 32 for call no. 5
> ProxyChannel.cxx(2436) H245 Set h245Address to 192.168.20.1:1030
> ProxyChannel.cxx(2387) H245 Connected from 192.168.20.10:1039
> ProxyChannel.cxx(2409) H245 [pub_gk_ip]:1079 DIDN'T ACCEPT THE CALL
> RasTbl.cxx(2136) CDR|5|02 13 67 96 33 32 03 76 56 34 34 34 34 ef 00
> 00|1|Sun, 17 Apr 2005 11:06:05 +0300|Sun, 17 Apr 2005 11:06:06
> +0300|192.168.20.10:1037|9679_endp$
>
> gkacct.cxx(918) GKACCT FileAcct logged event 2 for call no. 5
> gkacct.cxx(958) GKACCT Successfully logged event 2 for call no. 5
> RasSrv.cxx(219) RAS Send to [pub_gk_ip]:1719
>
> disengageRequest{} [...]
>
> ProxyChannel.cxx(722) Q931d Received: ReleaseComplete CRV=19932 from
> [pub_gk_ip]:1720
> RasSrv.cxx(168) RAS Read from [pub_gk_ip]:1719
> RasSrv.cxx(207) RAS
>
> disengageConfirm{} [...]
>
> RasSrv.cxx(1240) RAS Trapped DCF
> yasocket.cxx(500) ProxyH Select error: 10
> yasocket.cxx(600) Q931s 192.168.20.10:1037 Error(0): Bad file descriptor (8:9)
> yasocket.cxx(758) ProxyH(0) waiting...
> yasocket.cxx(600) H245s 192.168.20.10:1039 Error(0): Input/output
> error (12:104)
> yasocket.cxx(758) ProxyH(0) waiting...
> RasSrv.cxx(168) RAS Read from 192.168.20.10:1024
> RasSrv.cxx(207) RAS
>
> i gues the "bad file desc." and "i/o error" are side errors because of
> the previous 'DIDN'T ACCEPT THE CALL' error (missing check before
> opening/closing the socket ?)
>
> for a successfull call, there is the following line instead of the
> 'didn't accept the call' error:
>
> ProxyChannel.cxx(2407) H245 Connect to [pub_gk_ip]:1077 successful
>
> and then eveything as usual;
>
> gnugk's relevant config is:
>
> [RoutedMode]
> GKRouted=1
> H245Routed=0
> CallSignalPort=1720
> CallSignalHandlerNumber=1
> RtpHandlerNumber=1
> RemoveH245AddressOnTunneling=1
> DropCallsByReleaseComplete=1
> SupportNATedEndpoints=1
> H245PortRange=1024:1030 # tested without that one without sucess
> AcceptUnregisteredCalls=0
> AcceptNeighborsCalls=1
>
> [Proxy]
> Enable=1
> InternalNetwork=192.168.20.0/24
> T120PortRange=30000-31000
> RTPPortRange=30000-31000
>
> [Endpoint]
> Gatekeeper=[pub_gk_ip]
> Type=Gateway
> H323ID=mitevbg_gk1
> Prefix=72
> TimeToLive=60
> RRQRetryInterval=10
> Discovery=0
>
> the system is a fedora core 3 updated, athlon XP / msi kt400 ; the
> same thing happens with an old epia m800 (via c3) with the same fc3
> and kernel 2.6.11 (i didn't test if gnugk was working properly on
> 2.6.10 with this hardware though).
>
> anybody with a clue if it's a gnugk thread problem, a pwlib socket
> one, or even a kernel one ?
> if not, how can i manage to debug that in order to provide something
> useful ? - the debug trc 5 logs don't seem to show something useful...
>
> thanks
> ivan
>
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