[SIPForum-discussion] Why CANT a SIP (UDP) packet go through a IP gateway whereas a ICMP packet CAN ?!

[Md. Abu Saleh]

Dear Mr. Badri,

You have to stop the iptables on your router....when you stop the iptables
then it will be ok. by default all DELL server run their firewall.. so you
have to allow and stop setp by step...

Regards
Saleh


On Thu, Jun 27, 2013 at 7:37 PM, Badri Ranganathan <badri at arcatech.com>wrote:

> Hi all,****
>
> ** **
>
> Could someone help me with a strange problem I’m facing. (or is it strange
> only to me ?! ).    I have a setup as below -****
>
> ** **
>
> Linux Box1 (eth2) --------------------- D E L L - S E R V E R ------------------------(eth3)Linux
> Box 2****
>
> (10.30.104.3/28)                            (10.30.104.1/28)
> (10.30.103.1/28)                               (10.30.103.2/28)****
>
>             ****
>
> I have a sip client running on both linux box 1 and linux box 2.****
>
> So linux box1 is on network 10.30.104.0 and linux box2 belongs to network
> 10.30.103.0 (because of the /28 !)****
>
> ** **
>
> On linux Box 1, I have a route setup to reach 10.30.103.0 as follows –****
>
> route add –net 10.30.103.0 netmask 255.255.255.240 dev eth2****
>
> ** **
>
> On linux Box 2, I have a route setup to reach 10.30.104.0 as follows –****
>
> route add –net 10.30.104.0 netmask 255.255.255.240 dev eth3****
>
> ** **
>
> ** **
>
> I am able to ping to 10.30.103.2 from 10.30.104.3 and vice versa.****
>
> ** **
>
> But when I try to make a SIP call to client 10.30.103.2 from client
> 10.30.104.3, I can’t see the INVITE message on Linux Box 2 ! I can see
> the INVITE getting sent to the DELL SERVER (as I run wireshark on all these
> boxes including the dell server !)****
>
> ** **
>
> Why does the DELL SERVER NOT forward the INVITE request to the Linux Box 2
> in the same way that it sent the ICMP packet earlier when I did a ping !!
> Both are IP packets right.****
>
> Does the DELL Server need to be replaced by a router? Or otherwise - Do I
> need to do any IP Forwarding configuration etc on the DELL server to enable
> the packets to go from one network to the other?****
>
> ** **
>
> (The reason I neither used a Router nor tried to do any IP
> Forwarding/iptables etc., on the DELL Server is because I am able to reach
> Linux Box2 from Box 1 through a ping, and I believe  it should be ok for
> any IP packet.)****
>
> ** **
>
> Sincerely appreciate any help on solving my problem.****
>
> ** **
>
> Thanks,****
>
> Badri.****
>
> ** **
>
> ** **
>
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-- 



Md. Abu Saleh
*
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