[asterisk-dev] Feature request: Ability to assign which nic card or mac address to use for each trunk in sip.conf

[Jeff LaCoursiere]

On Thu, 28 May 2009, David Backeberg wrote:

> On Thu, May 28, 2009 at 4:08 AM, Kaloyan Kovachev <kkovachev at varna.net> wrote:
>> If each trunk is using diferent router IP - you don't need any changes in
>> Asterisk, but configuring the routing on the machine.
>>
>> Example:
>>  trunk 1 uses src IP 1.1.1.1 on eth0 and router 2.2.2.2
>>  trunk 2 uses src IP 1.1.1.2(but the same as on eth0 will also work) on eth1
>> and router 2.2.2.3
>>
>> ip a a dev eth0 1.1.1.1
>> ip a a dev eth1 1.1.1.2
>> ip r a 2.2.2.2 dev eth0 src 1.1.1.1
>> ip r a 2.2.2.3 dev eth1 src 1.1.1.2
>>
>> with this setup Asterisk will pickup the outgoing IP for each trunk properly
>
> This is true, and you can of course make this dramatically more
> complicated by adding more physical NICs, or virts on the same system,
> or ethernet bridging techniques.

I am guessing this won't help the OP, as he describes registering to the 
device on his network (otherwise the MAC wouldn't matter).  There is only 
one of them, and must assume only one IP.  There is no way for the routing 
layer to know which MAC should handle the outbound packet, as the 
determining factor is actually in the application layer.

>
> I second that you are trying to solve a solveable problem using a much
> harder approach than what to me and the other poster is the obvious
> solution already supported by asterisk.

I don't know that there is a solution already in asterisk, but the bottom 
line is code gets written by frustrated programmers.  It will be hard to 
find someone on this list that is frustrated with this particular problem 
because none of us actually have to deal with it.  One of NTT's customers 
will have to step up to the plate, probably, as I cannot really think of 
any other use for this patch.  The multipath example perhaps, but anyone 
needing that is probably already using routing equipment to solve that 
issue.

j