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When the nathelper module attempts to send OPTIONS ping messages on a host that has no default route set, the module errors out with one of two error messages.
Nov 1 18:58:01 localhost kam_registrar_1[2896]: ERROR: <core> [core/udp_server.c:591]: udp_send(): raw_iphdr_udp4_send(12,0x7f5be79587e6,4,...,212.2.172.228:39808,1500): Network is unreachable(101)
Nov 1 18:58:01 localhost kam_registrar_1[2896]: ERROR: nathelper [nathelper.c:2077]: nh_timer(): udp_send failed
or, when I enable udpping_from_path the error message is as follows
Nov 1 18:57:29 localhost kam_registrar_1[2793]: ERROR: nathelper [nathelper.c:2073]: nh_timer(): send_raw from path failed
Nov 1 18:57:49 localhost kam_registrar_1[2793]: ERROR: nathelper [nathelper.c:2073]: nh_timer(): send_raw from path failed
I am sending nat pings from a registrar behind a proxy. The registrar is on an internal network, the proxy has an interface on the internal network too.
I am storing the path information in location so that it can be used for the nat pings. The path information has the local internal address and port of the proxy to send the keepalive message via.
I have the "force_socket" parameter option set, which, I assume, is the socket to be used for all nat ping messages. This does not work as expected, I will open a seperate issue for this particular case.
I would have expected that the messages should be able to send to the proxy weather I have a default route set or not. NOTE: The default route, in this instance, is not on the same network that the sip traffic is flowing on.
I guess my expectation here is that if the destination to be sent to is on the same network as a socket that kamilio is listening on, then we should be able to send. In this case, the path is going to contain where to send to, but the actual contact of the aor is totally external.
Module settings are as follows:
registrar
modparam("registrar", "method_filtering", 1)
modparam("registrar", "case_sensitive", 1)
modparam("registrar", "append_branches", 0)
modparam("registrar", "use_path", 1)
modparam("registrar", "path_mode", 0)
modparam("registrar", "path_use_received", 1)
modparam("registrar", "path_check_local", 1)
modparam("registrar", "max_contacts", 1)
usrloc
modparam("usrloc", "db_mode", 0)
modparam("usrloc", "use_domain", 1)
modparam("usrloc", "timer_interval", 60)
modparam("usrloc", "timer_procs", 4)
modparam("usrloc", "nat_bflag", 6)
nathelper
modparam("nathelper", "natping_interval", 20)
modparam("nathelper", "natping_processes", 4)
modparam("nathelper", "ping_nated_only", 0)
modparam("nathelper", "sipping_from", "sip:keepalive@example.com")
modparam("nathelper", "sipping_method", "OPTIONS")
modparam("nathelper", "sipping_bflag", 6)
modparam("nathelper", "force_socket", "10.7.0.190:5060")
modparam("nathelper", "udpping_from_path", 1)
Nathelper force_socket is set to a socket that kamailio is listening on:
listen=udp:10.7.0.190:5060
An example registered user we are trying to ping:
kamctl ul show
{
"jsonrpc": "2.0",
"result": {
"Domain": "location",
"Size": 1024,
"AoRs": [{
"Info": {
"AoR": "example_user@example.com",
"HashID": -1389656423,
"Contacts": [{
"Contact": {
"Address": "sip:example_user@212.2.172.228:39808;rinstance=ed8aa63e90f53e97;transport=UDP",
"Expires": 66,
"Q": -1,
"Call-ID": "wE-GD4GzkrtuDAJUBJf1Jg..",
"CSeq": 58,
"User-Agent": "Z 3.15.40006 rv2.8.20",
"Received": "sip:212.2.172.228:39808",
"Path": "<sip:10.7.0.186:5062;lr;received=sip:212.2.172.228:39808>",
"State": "CS_NEW",
"Flags": 0,
"CFlags": 64,
"Socket": "udp:10.7.0.190:5060",
"Methods": -1,
"Ruid": "uloc-2-59fa1f9d-714-17",
"Instance": "[not set]",
"Reg-Id": 0,
"Last-Keepalive": 1509615136,
"Last-Modified": 1509615136
}
}]
}
}
],
"Stats": {
"Records": 1,
"Max-Slots": 1
}
},
"id": 4836
}
With the above settings, when I do not have a default route set for the host then I encounter the following error in the logs when attempting to ping:
Nov 1 18:57:29 localhost kam_registrar_1[2793]: ERROR: nathelper [nathelper.c:2073]: nh_timer(): send_raw from path failed
Nov 1 18:57:49 localhost kam_registrar_1[2793]: ERROR: nathelper [nathelper.c:2073]: nh_timer(): send_raw from path failed
If I comment out the "udpping_from_path" module parameter and restart kamailio, again, with no default route set, I get the following error:
Nov 1 18:58:01 localhost kam_registrar_1[2896]: ERROR: <core> [core/udp_server.c:591]: udp_send(): raw_iphdr_udp4_send(12,0x7f5be79587e6,4,...,212.2.172.228:39808,1500): Network is unreachable(101)
Nov 1 18:58:01 localhost kam_registrar_1[2896]: ERROR: nathelper [nathelper.c:2077]: nh_timer(): udp_send failed
If I add a default route to the system, then the OPTIONS pings are able to flow. See example traffic in "SIP Traffic" section below.
Shown in description and troubleshooting sections
When a default route is set, successful options messages are sent as below.
U 2017/11/02 07:50:54.191717 10.7.0.190:5060 -> 10.7.0.186:5062
OPTIONS sip:example_user@212.2.172.228:39808;rinstance=d74acdb581467154;transport=UDP SIP/2.0.
Via: SIP/2.0/UDP 10.7.0.190:5060;branch=z9hG4bK5526436.
Route: <sip:10.7.0.186:5062;lr;received=sip:212.2.172.228:39808>.
From: sip:keepalive@example.com;tag=uloc-2-59fa1f9d-711-3-9968b2da-c2c36781.
To: sip:example_user@212.2.172.228:39808;rinstance=d74acdb581467154;transport=UDP.
Call-ID: d9993f61-a1fd4752-73cdc76@10.7.0.190.
CSeq: 1 OPTIONS.
Content-Length: 0.
.
U 2017/11/02 07:50:54.192896 194.213.29.33:5062 -> 212.2.172.228:39808
OPTIONS sip:example_user@212.2.172.228:39808;rinstance=d74acdb581467154;transport=UDP SIP/2.0.
Max-Forwards: 10.
Record-Route: <sip:194.213.29.33:5062;r2=on;lr;ftag=uloc-2-59fa1f9d-711-3-9968b2da-c2c36781>.
Record-Route: <sip:10.7.0.186:5062;r2=on;lr;ftag=uloc-2-59fa1f9d-711-3-9968b2da-c2c36781>.
Via: SIP/2.0/UDP 194.213.29.33:5062;branch=z9hG4bK13ab.9ccb0733fcecc331893d95f2e09485ee.0.
Via: SIP/2.0/UDP 10.7.0.190:5060;rport=5060;branch=z9hG4bK5526436.
From: sip:keepalive@example.com;tag=uloc-2-59fa1f9d-711-3-9968b2da-c2c36781.
To: sip:example_user@212.2.172.228:39808;rinstance=d74acdb581467154;transport=UDP.
Call-ID: d9993f61-a1fd4752-73cdc76@10.7.0.190.
CSeq: 1 OPTIONS.
Content-Length: 0.
.
U 2017/11/02 07:50:54.248234 212.2.172.228:39808 -> 194.213.29.33:5062
SIP/2.0 200 OK.
Via: SIP/2.0/UDP 194.213.29.33:5062;branch=z9hG4bK13ab.9ccb0733fcecc331893d95f2e09485ee.0.
Via: SIP/2.0/UDP 10.7.0.190:5060;rport=5060;branch=z9hG4bK5526436.
Record-Route: <sip:194.213.29.33:5062;r2=on;lr;ftag=uloc-2-59fa1f9d-711-3-9968b2da-c2c36781>.
Record-Route: <sip:10.7.0.186:5062;r2=on;lr;ftag=uloc-2-59fa1f9d-711-3-9968b2da-c2c36781>.
Contact: <sip:192.168.1.64:39808>.
To: <sip:example_user@212.2.172.228:39808;rinstance=d74acdb581467154;transport=UDP>;tag=726ffa30.
From: sip:keepalive@example.com;tag=uloc-2-59fa1f9d-711-3-9968b2da-c2c36781.
Call-ID: d9993f61-a1fd4752-73cdc76@10.7.0.190.
CSeq: 1 OPTIONS.
Accept: application/sdp, application/sdp.
Accept-Language: en.
Allow: INVITE, ACK, CANCEL, BYE, NOTIFY, REFER, MESSAGE, OPTIONS, INFO, SUBSCRIBE.
Supported: replaces, norefersub, extended-refer, timer, outbound, path, X-cisco-serviceuri.
User-Agent: Z 3.15.40006 rv2.8.20.
Allow-Events: presence, kpml, talk.
Content-Length: 0.
.
U 2017/11/02 07:50:54.248922 10.7.0.186:5062 -> 10.7.0.190:5060
SIP/2.0 200 OK.
Via: SIP/2.0/UDP 10.7.0.190:5060;rport=5060;branch=z9hG4bK5526436.
Record-Route: <sip:194.213.29.33:5062;r2=on;lr;ftag=uloc-2-59fa1f9d-711-3-9968b2da-c2c36781>.
Record-Route: <sip:10.7.0.186:5062;r2=on;lr;ftag=uloc-2-59fa1f9d-711-3-9968b2da-c2c36781>.
Contact: <sip:192.168.1.64:39808>.
To: <sip:example_user@212.2.172.228:39808;rinstance=d74acdb581467154;transport=UDP>;tag=726ffa30.
From: sip:keepalive@example.com;tag=uloc-2-59fa1f9d-711-3-9968b2da-c2c36781.
Call-ID: d9993f61-a1fd4752-73cdc76@10.7.0.190.
CSeq: 1 OPTIONS.
Accept: application/sdp, application/sdp.
Accept-Language: en.
Allow: INVITE, ACK, CANCEL, BYE, NOTIFY, REFER, MESSAGE, OPTIONS, INFO, SUBSCRIBE.
Supported: replaces, norefersub, extended-refer, timer, outbound, path, X-cisco-serviceuri.
User-Agent: Z 3.15.40006 rv2.8.20.
Allow-Events: presence, kpml, talk.
Content-Length: 0.
.
In this case I added a default route as a work-around, however, I don't think that this should be the "fix"
version: kamailio 5.0.4 (x86_64/linux)
flags: STATS: Off, USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, 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 10:57:22 Oct 26 2017 with gcc 4.8.5
CentOS Linux release 7.4.1708 (Core)
Linux localhost 3.10.0-693.5.2.el7.x86_64 #1 SMP Fri Oct 20 20:32:50 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
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