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E15RQ22EZN9
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Joined: Tue Mar 02, 2021 12:49 pm

[Solved] Video streaming between Subnets - Stutter City

Fri May 26, 2023 6:23 pm

I have a small media server hosted on one subnet locally and i have clients on another subnet locally. Clients on the other subnet have extreme lag and stuttering when trying to stream content from the media server. If the client is on the same subnet as the media server, no problems. This leads me to believe there is some issue at the router responsible for passing traffic between the subnets. The configuration use to work fine, Not sure when it all went south. I have tried upgrading and downgrading software in the router, but no joy. Hoping someone may see something i missed in my config... or has experienced the same issue.

The RB4011 does not appear to be overly hungry for resources, CPU usuually is under 5%. Clients are all connected via Wired Connections with 1G to 10G connections so bandwith should not be a problem. I appreciate any help or insights, its a weird gremlin.

Wireshark packet capture shows alot of TCP Dup, TCP Out-Of-Order and TCP Retransmissions.


Router is RB4011
Media server is on VLAN 100 - IP addr: 10.0.4.10
Client is on VLAN 20 - 192.168.20.100
Last edited by E15RQ22EZN9 on Mon May 29, 2023 2:24 pm, edited 2 times in total.
 
E15RQ22EZN9
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Joined: Tue Mar 02, 2021 12:49 pm

Re: Video streaming between Subnets - Stutter City

Fri May 26, 2023 6:51 pm

Ok, So ran iperf3 between the subnets that are having an issue, the results seem to indicate there is a problem with on machines sending only?

I am thinking i have a bad optic to the router, seems that would explain poor one way transmission when going through the router. To confirm, I switched optics, then saw the problem between the subnet.
iperf3 -c 192.168.20.101 -B 10.0.4.20 --bidir
Connecting to host 192.168.20.101, port 5201
[  5] local 10.0.4.20 port 46823 connected to 192.168.20.101 port 5201
[  7] local 10.0.4.20 port 44353 connected to 192.168.20.101 port 5201
[ ID][Role] Interval           Transfer     Bitrate         Retr  Cwnd
[  5][TX-C]   0.00-1.00   sec   112 MBytes   943 Mbits/sec  403    195 KBytes       
[  7][RX-C]   0.00-1.00   sec   100 KBytes   822 Kbits/sec                  
[  5][TX-C]   1.00-2.00   sec   112 MBytes   937 Mbits/sec  392    194 KBytes       
[  7][RX-C]   1.00-2.00   sec  86.3 KBytes   707 Kbits/sec                  
[  5][TX-C]   2.00-3.00   sec   112 MBytes   936 Mbits/sec  361    141 KBytes       
[  7][RX-C]   2.00-3.00   sec  62.2 KBytes   510 Kbits/sec                  
[  5][TX-C]   3.00-4.00   sec   112 MBytes   940 Mbits/sec  385    140 KBytes       
[  7][RX-C]   3.00-4.00   sec  94.7 KBytes   776 Kbits/sec                  
[  5][TX-C]   4.00-5.00   sec   112 MBytes   937 Mbits/sec  379   94.7 KBytes       
[  7][RX-C]   4.00-5.00   sec   103 KBytes   846 Kbits/sec                  
[  5][TX-C]   5.00-6.00   sec   112 MBytes   936 Mbits/sec  372    139 KBytes       
[  7][RX-C]   5.00-6.00   sec  58.0 KBytes   475 Kbits/sec                  
[  5][TX-C]   6.00-7.00   sec   112 MBytes   940 Mbits/sec  373    136 KBytes       
[  7][RX-C]   6.00-7.00   sec   103 KBytes   846 Kbits/sec                  
[  5][TX-C]   7.00-8.00   sec   112 MBytes   938 Mbits/sec  400    136 KBytes       
[  7][RX-C]   7.00-8.00   sec  80.6 KBytes   660 Kbits/sec                  
[  5][TX-C]   8.00-9.00   sec   112 MBytes   936 Mbits/sec  451    139 KBytes       
[  7][RX-C]   8.00-9.00   sec  91.9 KBytes   753 Kbits/sec                  
[  5][TX-C]   9.00-10.00  sec   112 MBytes   937 Mbits/sec  376    140 KBytes       
[  7][RX-C]   9.00-10.00  sec   195 KBytes  1.60 Mbits/sec                  
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID][Role] Interval           Transfer     Bitrate         Retr
[  5][TX-C]   0.00-10.00  sec  1.09 GBytes   938 Mbits/sec  3892             sender
[  5][TX-C]   0.00-10.00  sec  1.09 GBytes   937 Mbits/sec                  receiver
[  7][RX-C]   0.00-10.00  sec  1.05 MBytes   883 Kbits/sec  180             sender
[  7][RX-C]   0.00-10.00  sec   976 KBytes   799 Kbits/sec                  receiver

iperf Done.

 
E15RQ22EZN9
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Posts: 10
Joined: Tue Mar 02, 2021 12:49 pm

Re: Video streaming between Subnets - Stutter City

Mon May 29, 2023 2:24 pm

I confirmed that it indeed was the optic. Replaced the optic and back to normal op.

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