[App_rpt-users] Strange RTCM Behavior

[Caleb Pal]

Tim,

I have watched multiple "100" counts of voter pings, and they all come 
back shortly after they are sent, I don't see any shaping behavior. I've 
outlined the network arch below. Both RTCM buffers are at 2000, 
voter.conf @ 250.

I ran another ping this morning:

PING (West): Packets tx: 10000, rx: 10000, oos: 0, Avg.: 5.997 ms
PING (West):  Worst: 17 ms, Best: 5 ms, 100.0% Packets successfully 
received (0.0% loss)

The network:

North RPT <-- UBNT 900MHz PtP --> RB-450G (IPSEC) <-- Fiber --> Cloud 
Core Router (IPSEC) <-- UBNT 5GHz PtP --> RB450G <-- Ethernet --> West RPT.

The North site is on a 50/50 Fiber connection with no competing traffic. 
App_rpt lives on a server at the North site. West is 25/25 with QOS 
providing 5Mbps to any of the RTCM traffic. No routing hops between the 
fiber connections.

The thing I find odd is that a restart of the RTCM temporarily fixes the 
issue.

RTCM's are both S/W Version: 1.46 03/04/2014.

Thanks,

Caleb

On 2/27/2015 0656, Tim Sawyer wrote:
> 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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