[asterisk-users] OpenVPN Clients Intermittently Cannot Call In

[Andrew Martin]

----- Original Message -----
> From: "Guenther Boelter" <gboelter at gmail.com>
> To: asterisk-users at lists.digium.com
> Sent: Tuesday, May 5, 2015 1:05:44 AM
> Subject: Re: [asterisk-users] OpenVPN Clients Intermittently Cannot Call In
> 
> > Looking into it further, in my case it does not appear to be a
> > NATing issue, since running OpenVPN from pfSense means there's no
> > NATing occurring between the clients or between the clients and the
> > asterisk server.
> > 
> > Although I was unable to reproduce the problems, I did notice some
> > packet loss and jitter in "sip show channelstats", here is a
> > sample: Peer             Call ID      Duration Recv: Pack  Lost
> > (     %) Jitter Send: Pack  Lost       (     %) Jitter
> > 192.168.32.26    446613544 at 1  00:03:03 0000000094  0000004238
> > (97.83%) 0.0000 0000000000  0000000244 ( 0.00%) 0.0000
> > 192.168.32.38    5b2ebdc92fd  00:03:03 0000000059  0000000001 (
> > 1.67%) 0.0000 0000000000  0000000091 ( 0.00%) 0.0028
> > 
> > I was unable to find documentation each of these columns, but the
> > high percentage of loss for received packets for 192.168.32.26
> > seems suspicious. Do these statistics indicate a problem?
> > 
> > Thanks,
> > 
> > Andrew
> 
> Hi Andrew,
> 
> is this a linux machine? If so, check your NIC with ifconfig for
> hardware errors.
> 
> Guenther
> 

Guenther,

Yes, this machine is running CentOS 6.4 (see my original post for more
details). This asterisk server has 2x gigabit NICs set up in a bond with
bond mode 1.

Both ifconfig and ethtool do not report any hardware errors,
although they do show a few checksum errors:
eth0      Link encap:Ethernet  HWaddr 00:11:22:33:44:55
          UP BROADCAST RUNNING SLAVE MULTICAST  MTU:1500  Metric:1
          RX packets:467927100 errors:0 dropped:0 overruns:1 frame:0
          TX packets:304724661 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:131747094082 (122.6 GiB)  TX bytes:93869585242 (87.4 GiB)
          Memory:fb920000-fb940000

eth1      Link encap:Ethernet  HWaddr AA:BB:CC:DD:EE:FF
          UP BROADCAST RUNNING SLAVE MULTICAST  MTU:1500  Metric:1
          RX packets:41250363 errors:0 dropped:0 overruns:0 frame:0
          TX packets:3467 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:5190889937 (4.8 GiB)  TX bytes:1594075 (1.5 MiB)
          Memory:fb900000-fb920000

>From ethtool -S eth0:
     tx_smbus: 164709
     rx_smbus: 119082408
     dropped_smbus: 104036

     rx_queue_0_packets: 97532982
     rx_queue_0_bytes: 16800645524
     rx_queue_0_drops: 1
     rx_queue_0_csum_err: 0
     rx_queue_0_alloc_failed: 0

     rx_queue_7_packets: 53850556
     rx_queue_7_bytes: 12797600155
     rx_queue_7_drops: 0
     rx_queue_7_csum_err: 41
     rx_queue_7_alloc_failed: 0

Thanks,

Andrew