asterisk users - Jul 2005 - IP-ID in RTP/UDP/IP packets

Hi All,

I am doing some testing with the asterisk server and have been
monitoring the packets exchanged during a SIP-ZAPTEL phone call.

I see that the IP-ID in all of the RTP/UDP/IP packets are set to zero.
After some googling, I have learnt that some of the linux
implementations set the IP-ID to 0 (if the DF bit is set in the IP
header) if the two hosts exchanging data are on the same subnet.

I see this happening in the RTP packets of the phone calls being made.

Is there a way to:
- force linux to send the right IP-ID?
- or to set the DF bit to 0 in an attempt to make the IP stack to put
in the right IP-ID?

Linux kernel being used: 2.4.20-8.

Please let me know,
Thanks,
Ajay

Hello

Did you tried a

Sysctl -w net.ipv4.ip_no_pmtu_disc=1

So /proc/sys/net/ipv4/ip_no_pmtu_disc is set to 1 and the kernel won't do
any mtu discovery

Best regards
Thierry
> -----Message d'origine-----
> De : asterisk-users-bounces@lists.digium.com 
> [mailto:asterisk-users-bounces@lists.digium.com] De la part de Aj
> Envoy? : vendredi 29 juillet 2005 06:25
> ? : asterisk-users@lists.digium.com
> Objet : [Asterisk-Users] IP-ID in RTP/UDP/IP packets
> 
> Hi All,
> 
> I am doing some testing with the asterisk server and have 
> been monitoring the packets exchanged during a SIP-ZAPTEL phone call.
> 
> I see that the IP-ID in all of the RTP/UDP/IP packets are set to zero.
> After some googling, I have learnt that some of the linux 
> implementations set the IP-ID to 0 (if the DF bit is set in the IP
> header) if the two hosts exchanging data are on the same subnet.
> 
> I see this happening in the RTP packets of the phone calls being made.
> 
> Is there a way to:
> - force linux to send the right IP-ID?
> - or to set the DF bit to 0 in an attempt to make the IP 
> stack to put in the right IP-ID?
> 
> Linux kernel being used: 2.4.20-8.
> 
> Please let me know,
> Thanks,
> Ajay
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