[App_rpt-users] Strange RTCM Behavior

[Tim Sawyer]

Do the pings “wind up and pitch”… i.e., no immediate response then they all come back in sorta of a batch? That would indicate traffic shaping on the new network.

The "packets out of bounds" message means the buffers are too small. Is the RTCM buffer set at 2000 (250ms)? 

One thing you might try is to change the port. Port 667 is viewed as a bad guy by some ISPs. I’ve been using port 2074 on problem systems. 

> On Feb 26, 2015, at 4:33 PM, Caleb Pal <cleb at defcon-3.net> wrote:
> 
> Hello All,
> 
> We have a two site Voted Simulcast consisting of 2 UHF Motorola Quantars, Thunderbolts, and 2 RTCM's. Master site is North, secondary Voter/TX site is West. Recently I have noticed significant choppy audio, mostly absent a PL, being transmitted from the West Site. It appears the repeater is keying/dekeying a couple times a second. On the West RTCM console I see:
> 
> 02/27/2015 00:23:15.592  Inbound (Eth Rx) packet out of bounds by: -60
> 02/27/2015 00:23:25.532  Inbound (Eth Rx) packet out of bounds by: -60
> 02/27/2015 00:23:35.532  Inbound (Eth Rx) packet out of bounds by: -60
> 
> Physical link between the sites is over a Ubiquiti 5GHz link, then fiber. IPSEC end to end. Voter Ping output is below.
> 
> PING (West): Packets tx: 100, rx: 100, oos: 0, Avg.: 13.940 ms
> PING (West):  Worst: 22 ms, Best: 7 ms, 100.0% Packets successfully received (0.0% loss)
> 
> Standard ping between Voter and West RTCM:
> 
> 3297 packets transmitted, 3293 received, 0% packet loss, time 3297289ms
> rtt min/avg/max/mdev = 2.953/4.166/111.124/3.812 ms
> 
> TX/RX buffers are 250ms. When I restart the West RTCM, the symptoms resolve for a hour or so, then begin to occur again.
> 
> System was previously functioning normally. Only change has been from ADSL to fiber at the North site. West site was down for 2-3 weeks while the line was switched, so I can't absolutely correlate this issue to the connection change.
> 
> Pings when the issue is occurring look good (<10ms voter to West RTCM)
> 
> Any ideas?
> 
> Thanks,
> 
> Caleb
> 
> 
> 
> 
> 
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