[SR-Users] t_relay changing source IP?

Tue Oct 26 01:00:06 CEST 2021

Understood, makes sense. I am not sure if outbound listener selection is entirely deterministic, though, in the absence of either clear routing table feedback via mhomed or explicit steering via $fs.

—
Sent from mobile, with due apologies for brevity and errors.

> On Oct 25, 2021, at 6:52 PM, Brooks Bridges <bbridges at call48.com> wrote:
> 
> apologies, I missed the second half of your post.  We do not, and I know I could explicitly tell it to use that IP, however I am more interested in figuring out what might cause it to decide to use the interface IP, seemingly without a clear reason.  I am not a fan of static configuration of things like that in shared environments.
> 
> -----Original Message-----
> From: Brooks Bridges
> Sent: Monday, October 25, 2021 3:48 PM
> To: Kamailio (SER) - Users Mailing List <sr-users at lists.kamailio.org>
> Subject: RE: [SR-Users] t_relay changing source IP?
> 
> Correct.
> 
> listen=lo:5060
> listen=eth0:5060
> listen=eth1:5060
> listen=XXX.XXX.XXX.XXX:5060  (<--- HA IP)
> 
> -----Original Message-----
> From: sr-users <sr-users-bounces at lists.kamailio.org> On Behalf Of Alex Balashov
> Sent: Monday, October 25, 2021 3:35 PM
> To: Kamailio (SER) - Users Mailing List <sr-users at lists.kamailio.org>
> Subject: Re: [SR-Users] t_relay changing source IP?
> 
> I take it you have listeners on both the interface IP and the HA IP?
> 
> Absent ‘mhomed=1’, do you regulate egress interface selection for all t_relay() cases with $fs explicitly? If not, try that.
> 
>> On Oct 25, 2021, at 6:25 PM, Brooks Bridges <bbridges at call48.com> wrote:
>> 
>> That's been set to 0 since inception and this has just recently become an issue.
>> 
>> -----Original Message-----
>> From: sr-users <sr-users-bounces at lists.kamailio.org> On Behalf Of Alex Balashov
>> Sent: Monday, October 25, 2021 3:19 PM
>> To: Kamailio (SER) - Users Mailing List <sr-users at lists.kamailio.org>
>> Subject: Re: [SR-Users] t_relay changing source IP?
>> 
>> Does the behaviour differ depending on whether ‘mhomed’ is on?
>> 
>> https://www.kamailio.org/wiki/cookbooks/5.5.x/core#mhomed
>> 
>>>> On Oct 25, 2021, at 6:15 PM, Brooks Bridges <bbridges at call48.com> wrote:
>>> 
>>> So we have a box that's bound to all interfaces on the server, and one specific IP address (that is an HA IP), and I've run into a bit of an odd behavior that I cannot explain.
>>> 
>>> For 99.9999% of our traffic, the invites come into the HA IP, and then are forwareded out the HA IP to an SBC for further processing.  In a very rare instance however, I have found that there is an invite coming in the HA IP, and for some unknown reason it gets forwarded out the *interface* ip instead of the HA IP.
>>> 
>>> For example:
>>> 
>>> Working:
>>> 1.2.3.4 -- invite --> 9.8.7.6 (ha IP) -- invite --> 5.6.7.8 (sbc)
>>> 
>>> Non working:
>>> 1.2.3.4 -- invite --> 9.8.7.6 (ha IP) *something happens here* 9.8.7.5 (interface IP) -- invite --> 5.6.7.8 (sbc)
>>> 
>>> I've been through tm, tmx, and the incoming invite of a working and non working request with a fine toothed comb and I cannot for the life of me explain this behavior.  Any thoughts?
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>> 
>> --
>> Alex Balashov | Principal | Evariste Systems LLC
>> 
>> Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free)
>> Web: http://www.evaristesys.com/, http://www.csrpswitch.com/
>> 
>> 
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> 
> --
> Alex Balashov | Principal | Evariste Systems LLC
> 
> Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free)
> Web: http://www.evaristesys.com/, http://www.csrpswitch.com/
> 
> 
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