[Users] clienst behind same NAT

[Daniel-Constantin Mierla]

A small errata, to match an IP address:

avp_subst("i:20/d","/.*([1-9][0-9]{0,2}\.[1-9][0-9]{0,2}\.[1-9][0-9]{0,2}\.[1-9][0-9]{0,2}).*"/\1/); 



Daniel


On 08/18/05 14:17, Daniel-Constantin Mierla wrote:

>
>
> On 08/18/05 13:24, Klaus Darilion wrote:
>
>> If oyu use fix_nated_contact for REGISTER messages, than it should work.
>>
>> If ouy use fix_nated_register, it will not work. We would need a 
>> pseudo variable which points to the received-socket. Maybe the core 
>> developers can help you on this.
>
>
> There is a pseudo variable $du that points to destination uri (dst_uri 
> filed of sip_msg structure - the address where the sip message will be 
> sent after a loose_route() or lookup() request for callee behind the 
> nat).
>
> So, if the callee is behind the nat, the dst_uri is set to the address 
> and port of the NAT. To check it, copy $du in an avp, use avp_subst() 
> to extract the ip address and and compare it with src_ip.
>
> avp_printf("i:20","$du");
> avp_subst("i:20/d","/.*([1-9][0-9]{1,2}\.[1-9][0-9]{1,2}\.[1-9][0-9]{1,2}\.[1-9][0-9]{1,2}).*"/\1/); 
>
> if(avp_check("i:20","eq/$src_ip")) {
>    # src_ip is the same with destination ip
> }
>
> Looking at this issue, I am wondering if worth to add the 
> pseudovariables $dh and $dp for destination host and port ... Also I 
> am considering to change a bit the $du reference so when the dst_uri 
> is not set to point to request URI. Would be these changes usefully?
>
> Daniel
>
>>
>> regards
>> klaus
>>
>> jayesh nambiar wrote:
>>
>>> hi all,
>>> Thanx Klaus.
>>> Sorry to ask a question again related to the same problem. I had 
>>> already tried writing the avp_write after lookup but even that 
>>> causes a problem.
>>> When avp_write is done it writes the private IP address of the 
>>> callee while the source_ip is the IP address of the NAT. I beleive 
>>> this IP address is written because of the fix_nated_contact.
>>> Again, when avp_check is done, it returns false and again the RTP 
>>> session gets started. IS there any way out to this problem.
>>> Thanx again..
>>> Jayesh
>>>
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>>
>>
>>
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