[sr-dev] SIP ping, sockets and multi homed
Patrick Wakano
pwakano at gmail.com
Fri Sep 22 04:42:43 CEST 2017
Hello list,
After deep investigation I found out that the issue is happening because of
the mechanism Kamailio uses to find the most appropriate socket combined
with the virtual IP usage....
For socket selection, Kamailio first asks Linux which would be the routing
for a certain destination, then matches this outcome with the list of
listened sockets.
By default Linux will always return the local IP instead of the virtual
one. So if Kamailio only binds to the virtual IP, the Linux's returned IP
won't match our socket list and then the socket selection fails....
So currently Kamailio active/stand-by HA setup with virtual IP in a
multi-homed environment does not work properly...
We can overcome this by listening to all addresses, but then Kamailio will
decide to use the local IP instead of the virtual one, and then the HA idea
end up broken....
We can also force socket for everything. For regular call routing, this
options actually works fine if the script always force some socket, but it
seems to be not always possible for local generated messages. By disabling
mhomed and using the dispatcher socket attr to send the OPTIONS message it
works for example. But for the LCR module we have no option because
apparently the LCR module has only one socket option, and so I am not able
have a different socket per gateway.
We can also explicitly set the src address for a routing rule to be the
virtual IP instead of the local one. This makes Linux to return the virtual
IP instead of the local one. This solution seems fine, but since it is done
at linux level, every other service on the box would be affected and every
route on the box would needed to be changed..
Another problem I found out is that I am not able to force the socket for
local generated messages. It actually crashes Kamailio, and I always get a
"core was not generated" msg.... anyone aware of that?
The actual fix for this, would be having Kamailio to search the most
appropriate socket in a different manner. It could loop the sockets and see
which one reaches the destination instead of asking Linux to do it, or it
could have some routing directives which could be consulted before
selecting a socket.... (just ideas, not sure how feasible they are...)
I am considering using the Linux routing change option, but has anyone
faced such situation before?
Regards,
Patrick Wakano
On 24 August 2017 at 09:18, Patrick Wakano <pwakano at gmail.com> wrote:
> Hello Daniel,
> I still couldn't make this SIP probing work.... So currently my setup
> cannot actively check for GW availability...
> Any idea about what may be causing it?
>
> Thanks for your time,
> Patrick Wakano
>
> On 16 August 2017 at 13:01, Patrick Wakano <pwakano at gmail.com> wrote:
>
>> Forgot to mention it is a centos7 box...
>>
>> On 16 Aug. 2017 11:02 am, "Patrick Wakano" <pwakano at gmail.com> wrote:
>>
>>> Hi Daniel!
>>> Very grateful for your attention!
>>>
>>> Apologies for lacking important info, check below the version and
>>> sockets.
>>> It may be worth mentioning these IPs are virtual ones and I am using net.ipv4.ip_nonlocal_bind
>>> = 1(in this case the virtual IP is assigned to the box)
>>> Interesting that it has a "mhomed: no" for all sockets but I do have
>>> mhomed=1 in my cfg file.... could that be the issue?
>>> Also there is no message before this one: /usr/sbin/kamailio[6164]:
>>> ERROR: <core> [core/forward.c:181]: get_out_socket(): no socket found
>>> This is the first one that pops when dispatcher tries to ping....
>>>
>>> Thanks,
>>> Patrick
>>>
>>> kamailio -v
>>> version: kamailio 5.0.2 (x86_64/linux)
>>> flags: STATS: Off, USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, DISABLE_NAGLE,
>>> USE_MCAST, DNS_IP_HACK, SHM_MEM, SHM_MMAP, PKG_MALLOC, Q_MALLOC, F_MALLOC,
>>> TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT,
>>> USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLACKLIST,
>>> HAVE_RESOLV_RES
>>> ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE 262144, MAX_LISTEN 16,
>>> MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB
>>> poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
>>> id: unknown
>>> compiled on 12:03:49 Jun 26 2017 with gcc 4.8.5
>>>
>>> kamcmd> core.sockets_list
>>> {
>>> socket: {
>>> proto: udp
>>> address: 172.28.128.100
>>> ipaddress: 172.28.128.100
>>> port: 5060
>>> mcast: no
>>> mhomed: no
>>> }
>>> socket: {
>>> proto: udp
>>> address: 192.168.33.100
>>> ipaddress: 192.168.33.100
>>> port: 5060
>>> mcast: no
>>> mhomed: no
>>> }
>>> socket: {
>>> proto: tcp
>>> address: 172.28.128.100
>>> ipaddress: 172.28.128.100
>>> port: 5060
>>> mcast: no
>>> mhomed: no
>>> }
>>> socket: {
>>> proto: tcp
>>> address: 192.168.33.100
>>> ipaddress: 192.168.33.100
>>> port: 5060
>>> mcast: no
>>> mhomed: no
>>> }
>>> socket: {
>>> proto: tcp
>>> address: 172.28.128.100
>>> ipaddress: 172.28.128.100
>>> port: 8080
>>> mcast: no
>>> mhomed: no
>>> }
>>> }
>>>
>>>
>>> On 15 August 2017 at 17:24, Daniel-Constantin Mierla <miconda at gmail.com>
>>> wrote:
>>>
>>>> Hello,
>>>>
>>>> what are the sockets kamailio is listening on? See `kamcmd help` for
>>>> the command that lists the sockets.
>>>>
>>>> Also, what is the log messages before the first one you pasted, there
>>>> should be another one printed from get_out_socket().
>>>> It is always important to provide kamailio version (kamailio -v) and
>>>> the operating system you are using.
>>>>
>>>> Cheers,
>>>> Daniel
>>>>
>>>>
>>>> On 14.08.17 14:41, Patrick Wakano wrote:
>>>>
>>>> Hello Kamailio list,
>>>>
>>>> Hope you all doing well!
>>>>
>>>> I am stuck with one problem that should be incredibly easy to be done,
>>>> but apparently it is not.... I want my dispatcher, LCR and nathelper
>>>> modules to always SIP ping my SIP clients. I have a Kamailio based SBC that
>>>> is separating two networks, and so I am using the 'mhomed' flag, but none
>>>> of these SIP pings are working.... for now I will only ask about the
>>>> dispatcher....
>>>> My dispatcher module has to talk with SIP servers in both networks, the
>>>> thing is when I enable SIP ping for it (modparam("dispatcher",
>>>> "ds_probing_mode", 1)), it gives me this type of error:
>>>> /usr/sbin/kamailio[6164]: ERROR: <core> [core/forward.c:181]:
>>>> get_out_socket(): no socket found
>>>> /usr/sbin/kamailio[6164]: ERROR: <core> [core/forward.c:183]:
>>>> get_out_socket(): no corresponding socket found for(udp:
>>>> 192.168.33.110:6060)
>>>> /usr/sbin/kamailio[6164]: ERROR: tm [ut.h:317]: uri2dst2(): no
>>>> corresponding socket found for "192.168.33.110" af 2 (udp:
>>>> 192.168.33.110:6060)
>>>> /usr/sbin/kamailio[6164]: ERROR: tm [uac.c:443]: t_uac_prepare(): no
>>>> socket found
>>>> /usr/sbin/kamailio[6164]: ERROR: dispatcher [dispatch.c:2652]:
>>>> ds_ping_set(): unable to ping [sip:192.168.33.110:6060]
>>>>
>>>> After research it seems I need to manually set a "socket" attribute for
>>>> each of my GWs in dispatcher list. After putting the socket parameter for
>>>> the GW, I got another error:
>>>> /usr/sbin/kamailio[14190]: ERROR: <core> [core/socket_info.c:2046]:
>>>> parse_protohostport(): bad port number in udp:192.168.33.100:5060
>>>> /usr/sbin/kamailio[14190]: ERROR: <core> [core/forward.c:181]:
>>>> get_out_socket(): no socket found
>>>> /usr/sbin/kamailio[14190]: ERROR: <core> [core/forward.c:183]:
>>>> get_out_socket(): no corresponding socket found for(udp:
>>>> 192.168.33.110:6060)
>>>> /usr/sbin/kamailio[14190]: ERROR: tm [ut.h:317]: uri2dst2(): no
>>>> corresponding socket found for "192.168.33.110" af 2 (udp:
>>>> 192.168.33.110:6060)
>>>> /usr/sbin/kamailio[14190]: ERROR: tm [uac.c:443]: t_uac_prepare(): no
>>>> socket found
>>>> /usr/sbin/kamailio[14190]: ERROR: dispatcher [dispatch.c:2652]:
>>>> ds_ping_set(): unable to ping [sip:192.168.33.110:6060]
>>>>
>>>> What can be wrong in my port info in the socket config? (I tried the
>>>> socket with and without quotes but had no luck...)
>>>> select * from dispatcher where id=2;
>>>> id | setid | destination | flags | priority
>>>> | attrs | description
>>>> ----+-------+-------------------------+-------+----------+--
>>>> -------------------------------------------+---------------------
>>>> 2 | 2 | sip:192.168.33.110:6060 | 0 | 0 | socket="udp:
>>>> 192.168.33.100:5060";rweight=50 |
>>>> (1 row)
>>>>
>>>> Anyhow, I was expecting the 'mhomed' parameter to do the socket
>>>> selection for me. Regular call routing either by the dispatcher or by LCR,
>>>> also seems to require me to explicitly set the socket otherwise Kamailio
>>>> (or the OS) may end up using the wrong socket. So, another question is why
>>>> 'mhomed' does not dictate the whole socket selection Kamailio has to do
>>>> regardless the module it is using to send SIP requests?
>>>>
>>>> Sorry for the long e-mail....
>>>> Best regards,
>>>> Patrick Wakano
>>>>
>>>>
>>>> _______________________________________________
>>>> Kamailio (SER) - Development Mailing Listsr-dev at lists.kamailio.orghttps://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-dev
>>>>
>>>>
>>>> --
>>>> Daniel-Constantin Mierlawww.twitter.com/miconda -- www.linkedin.com/in/miconda
>>>> Kamailio Advanced Training - www.asipto.com
>>>> Kamailio World Conference - www.kamailioworld.com
>>>>
>>>>
>>>
>
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