4 Nov
2018
4 Nov
'18
3:28 p.m.
Thank you all for the good tips. I found the issue! Luckily not an issue with Kamailio
after all. The issue is that Linux enables reverse path filtering by default. I tried to
substitute Kamailio with a simple Python server, and I noticed that it wasn't showing
me any output either. So I started digging around in the Linux settings and found that we
needed to disable reverse path filtering.
The Python script used to substitute Kamailio:
```python
import socket
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sock.bind(('0.0.0.0', 5060))
while True:
data, addr = sock.recvfrom(1024)
print "Received message:", data
```
More information about reverse path filtering:
https://www.tldp.org/HOWTO/Adv-Routing-HOWTO/lartc.kernel.rpf.html
I guess we missed this setting during migration. If it helps anyone in the future, to
disable remote path filtering (at your own risk, obviously):
```bash
for interface in /proc/sys/net/ipv4/conf/*/rp_filter; do
echo 1 > ${interface}
done
```
To be clear, the `mhomed` setting is not mandatory and in our case not desired.
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