[Spce-user] BUG nathelper

[Danny Cappellari | ConnectLife S.p.A]

I would like to report several critical errors in /var/log/ngcp/kamailio-proxy.log

ERROR: <core> [core/udp_server.c:821]: udp_send(): sendto(... dst:(1.2.3.5:5060) ...) - err: Invalid argument (22)
CRITICAL: <core> [core/udp_server.c:828]: udp_send(): invalid sendto parameters ... server is bound to localhost and attempts to send to the net
ERROR: nathelper [nathelper.c:2458]: nh_timer(): sip udp_send failed

Cause

This is the nathelper / NAT keepalive (natping) proxy module. From the active config:
- natping_processes = 7, natping_interval = 30
- no natping_socket defined.

The proxy sockets are 127.0.0.1:5060, 1.2.3.4:5060, 127.0.0.1:5062.

REGISTERS arrive at the proxy from the load balancer via loopback, so the socket stored for contacts is 127.0.0.1. When natping tries to send a keepalive to the contact's public IP using the loopback socket as the source, the kernel rejects sendto() with EINVAL(22) → "server is bound to localhost". With ping_nated_only=0, it also tries non-NAT peers.

Impact

- CPU waste on the 7 natping processes and hundreds of MB of logs per day (risk of filling up the /var disk).
- NAT keepalives don't work for anyone: the NAT pinholes of phones actually behind the NAT are no longer refreshed → after the NAT timeout, incoming calls to those phones may no longer arrive.

Do you have any solutions?
Version mr-13.5.1



----------
Cappellari Danny
CEO | ConnectLife S.p.A

Tel. +39 045 2081019 | Mobile: +39 392 4206436
cappellari at connectlife.it<mailto:cappellari at connectlife.it>

[1770113372656]


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