This one could be caused by pix, but as long as there is no evidence it stays a guess and pix can't be claimed guilty. (Why I think it could be this way is that pix is able to rewrite SIP packets and maybe there is an error in udp checksum recomputation.)

-jiri

At 04:05 AM 11/5/2003, Stephen Miles wrote:

I am also seeing this in my syslog:

kernel: UDP: bad checksum. From 202.180.76.97:36589 to 202.180.83.14:5060 ulen 477

Don't know if this is related but the 76.97 address is the Cisco Pix and 83.14 is the server running SER.

Cheers,

Stephen

Stephen Miles wrote:

...

Hi all, I am having a little problem involving a Cisco Pix firewall using nat. The error I am getting is: ERROR: udp_rcv_loop:recvfrom:[11] Resource temporarily unavailable I can't seem to find any info about what this error means and the udp_server.c doesn't tell me much. Is it related to the port the Pix is trying to use when it re-writes the out bound request? any idea? Using x-lite latest build on an XP laptop behind a Cisco Pix talking to SER latest CVS build (everything compiled fine)

Thanks in advance, Stephen

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-- Jiri Kuthan http://iptel.org/~jiri/

Hi Jiri,

Can you tell me which kernel you are using. I am using a 2.4.21 kernel at the moment, fairly standard with all the iptables support built in.

Jiri Kuthan wrote:

At 03:59 AM 11/5/2003, Stephen Miles wrote:

...

Hi all,

I am having a little problem involving a Cisco Pix firewall using nat.

The error I am getting is: ERROR: udp_rcv_loop:recvfrom:[11] Resource temporarily unavailable

I can't seem to find any info about what this error means and the udp_server.c doesn't tell me much.

We occasionaly receive it at our server too on some kernels. I suppose that's a kernel problem with no known impact -- when kernel returns an error for UDP receiver the receiver starts all over again till no more error occurs.

...

Is it related to the port the Pix is trying to use when it re-writes the out bound request?

it is not related to use of pix.

-jiri

----------------------------------------------------------------------------------------------- This message and any attachments contain privileged and confidential information. If you are not the intended recipient of this message, you are hereby notified that any use, dissemination, distribution or reproduction of this message is prohibited. If you have received this message in error please notify the sender immediately via email and then destroy this message and any attachments.

Hi Jiri,

Thanks for that. It looks the same as what I am seeing.

What I have found is that if I can quess the port that the pix is going to use next and set that as my port i.e sip:stephenm@202.180.76.97:60547 it will work, I only get one way audio but thats no matter at the moment. What I have seen is that the register isn't even getting into the routing logic of ser when the port of the client is left set to 5060.

This doesn't happen for clients behind the same pix but with a 1 to 1 nat setup, i.e I am the only person being natted behind the IP 202.180.76.103. Other clients who are in the main nat pool and get natted behind .76.97 seem to have the problem because the pix is not keeping the ports original when it sends the request. I thought that the nathelper module was ment to address this?

Any idea?

Thanks in advance, Stephen

Jiri Kuthan wrote:

That's what I have (uname -a bellow). -jiri

root@fox:/var/log# grep "Resource temporarily unavailable" syslog |tail Nov 5 20:29:39 fox /home/srouter/bin/sr[7682]: ERROR: udp_rcv_loop:recvfrom:[11] Resource temporarily unavailable Nov 5 20:49:39 fox /home/srouter/bin/sr[8226]: ERROR: udp_rcv_loop:recvfrom:[11] Resource temporarily unavailable Nov 5 21:57:39 fox /home/srouter/bin/sr[8206]: ERROR: udp_rcv_loop:recvfrom:[11] Resource temporarily unavailable Nov 5 22:29:39 fox /home/srouter/bin/sr[8206]: ERROR: udp_rcv_loop:recvfrom:[11] Resource temporarily unavailable Nov 5 22:29:39 fox /home/srouter/bin/sr[8226]: ERROR: udp_rcv_loop:recvfrom:[11] Resource temporarily unavailable Nov 5 22:29:41 fox /home/srouter/bin/sr[8233]: ERROR: udp_rcv_loop:recvfrom:[11] Resource temporarily unavailable Nov 5 22:49:39 fox /home/srouter/bin/sr[8215]: ERROR: udp_rcv_loop:recvfrom:[11] Resource temporarily unavailable Nov 5 23:53:34 fox /home/srouter/bin/sr[13773]: ERROR: udp_rcv_loop:recvfrom:[11] Resource temporarily unavailable Nov 6 00:05:39 fox /home/srouter/bin/sr[13750]: ERROR: udp_rcv_loop:recvfrom:[11] Resource temporarily unavailable Nov 6 00:06:01 fox /home/srouter/bin/sr[13778]: ERROR: udp_rcv_loop:recvfrom:[11] Resource temporarily unavailable root@fox:/var/log# uname -a Linux fox 2.4.20-xfs #1 SMP Fri Mar 28 17:04:13 CET 2003 i686 GNU/Linux

At 12:20 AM 11/6/2003, Stephen Miles wrote:

...

Hi Jiri,

Can you tell me which kernel you are using. I am using a 2.4.21 kernel at the moment, fairly standard with all the iptables support built in.

Jiri Kuthan wrote:

...

At 03:59 AM 11/5/2003, Stephen Miles wrote:

...

Hi all,

I am having a little problem involving a Cisco Pix firewall using nat.

The error I am getting is: ERROR: udp_rcv_loop:recvfrom:[11] Resource temporarily unavailable

I can't seem to find any info about what this error means and the udp_server.c doesn't tell me much.

We occasionaly receive it at our server too on some kernels. I suppose that's a kernel problem with no known impact -- when kernel returns an error for UDP receiver the receiver starts all over again till no more error occurs.

...

Is it related to the port the Pix is trying to use when it re-writes the out bound request?

it is not related to use of pix. -jiri

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-- Jiri Kuthan http://iptel.org/~jiri/

----------------------------------------------------------------------------------------------- This message and any attachments contain privileged and confidential information. If you are not the intended recipient of this message, you are hereby notified that any use, dissemination, distribution or reproduction of this message is prohibited. If you have received this message in error please notify the sender immediately via email and then destroy this message and any attachments.