[asterisk-bugs] [JIRA] (ASTERISK-28118) v16.0.0: Not forwarding RTP packets

[Samuel For (JIRA)]

Samuel For created ASTERISK-28118:
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             Summary: v16.0.0: Not forwarding RTP packets
                 Key: ASTERISK-28118
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-28118
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Channels/chan_rtp
    Affects Versions: 16.0.0
         Environment: Ubuntu 18.04. Asterisk 16.0.0. chan_sip.
            Reporter: Samuel For


Hi there,

We were going to do some performance benchmarks of Asterisk 16.0.0 on different cloud providers but instead we ran into a problem where Asterisk continously drops RTP packets. We believe this to be a bug in Asterisk.

This is the setup:

CLIENT - Client which generates a call
SUBJECT - This is the machine we are benchmarking, it forwards the call from CLIENT to ITSP
ITSP - Fake ITSP that receives the call and plays MOH back

Doing this, we see that the SUBJECT has packet loss on both outgoing legs towards CLIENT and ITSP. When we run a tcpdump on SUBJECT we see the packets coming from the ITSP, no loss, but SUBJECT is not forwarding all of them, about 3% are lost and never reaches the outbound network interface. Hence, it does not seem to be an external networking issue.

We thought this might be related to the cloud provider, so we tested on AWS EC2 (XEN and Nitro/KVM), DigitalOcean (KVM) and it was failing on all of them.

The SUBJECT is not under any other load, so this happens from the first call.

Machine specs for all of them:
2 CPU
4GB Ram
Ubuntu 18.04
No firewall enabled
The machine is basically unloaded during this. Load is 0.0, Idle 100% etc..

Please find a PCAP attached that shows this phenomenon. 

CLIENT: 85.24.248.224
SUBJECT: 104.248.244.68
ITSP: 35.157.105.234

I've also attached the full configuration and build script we used to setup the Asterisk machine.

We have the machines up and running for a few more days so I'm happy to collect any data or run any tests you deem appropriate.

Thanks!



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