Daemon.notice netifd: wan6 (6476): cat: write error: Broken pipe

I am getting this in the logs very regularly but yet on a rather random basis, around every -240-600s and cant seem to figure out the cause:

Daemon.notice netifd: wan6 (6476): cat: write error: Broken pipe

ping6 commands on clients and router seem to work just fine:

router

root@router:~# ping6 ipv6.google.com
PING ipv6.google.com (2a00:1450:4001:831::200e): 56 data bytes
64 bytes from 2a00:1450:4001:831::200e: seq=0 ttl=119 time=20.266 ms
64 bytes from 2a00:1450:4001:831::200e: seq=1 ttl=119 time=16.445 ms
64 bytes from 2a00:1450:4001:831::200e: seq=2 ttl=119 time=17.072 ms
64 bytes from 2a00:1450:4001:831::200e: seq=3 ttl=119 time=15.445 ms
64 bytes from 2a00:1450:4001:831::200e: seq=4 ttl=119 time=15.286 ms

--- ipv6.google.com ping statistics ---
5 packets transmitted, 5 packets received, 0% packet loss
round-trip min/avg/max = 15.286/16.902/20.266 ms

client

C:\Users\root>ping -6 ipv6.google.com

Pinging ipv6.l.google.com [2a00:1450:4001:831::200e] with 32 bytes of data:
Reply from 2a00:1450:4001:831::200e: time=16ms
Reply from 2a00:1450:4001:831::200e: time=13ms
Reply from 2a00:1450:4001:831::200e: time=10ms
Reply from 2a00:1450:4001:831::200e: time=10ms

Ping statistics for 2a00:1450:4001:831::200e:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 10ms, Maximum = 16ms, Average = 12ms

I did find Odhcp6c logspamming via netifd: cat: write error: Broken pipe but trying to do

cat /proc/sys/net/ipv6/conf/eth0/hop_limit
cat /proc/sys/net/ipv6/conf/eth1/hop_limit

do not yield any errors, just returns 64.

iperf3 tests on the router also seem to go through just fine:

iperf3 -6 -u -t 120 -p 5200 -c ping6.online.net
Connecting to host ping6.online.net, port 5200
[  5] local myipv6::1 port 47898 connected to 2001:bc8:1::40 port 5200
[ ID] Interval           Transfer     Bitrate         Total Datagrams
[  5]   0.00-1.00   sec   128 KBytes  1.05 Mbits/sec  92  
[  5]   1.00-2.00   sec   128 KBytes  1.05 Mbits/sec  92  
[  5]   2.00-3.00   sec   128 KBytes  1.05 Mbits/sec  92  
[  5]   3.00-4.00   sec   128 KBytes  1.05 Mbits/sec  92  
[  5]   4.00-5.00   sec   127 KBytes  1.04 Mbits/sec  91  
[  5]   5.00-6.00   sec   128 KBytes  1.05 Mbits/sec  92  
[  5]   6.00-7.00   sec   128 KBytes  1.05 Mbits/sec  92  
[  5]   7.00-8.00   sec   128 KBytes  1.05 Mbits/sec  92  
[  5]   8.00-9.00   sec   127 KBytes  1.04 Mbits/sec  91  
[  5]   9.00-10.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  10.00-11.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  11.00-12.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  12.00-13.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  13.00-14.00  sec   127 KBytes  1.04 Mbits/sec  91  
[  5]  14.00-15.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  15.00-16.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  16.00-17.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  17.00-18.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  18.00-19.00  sec   127 KBytes  1.04 Mbits/sec  91  
[  5]  19.00-20.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  20.00-21.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  21.00-22.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  22.00-23.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  23.00-24.00  sec   127 KBytes  1.04 Mbits/sec  91  
[  5]  24.00-25.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  25.00-26.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  26.00-27.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  27.00-28.00  sec   127 KBytes  1.04 Mbits/sec  91  
[  5]  28.00-29.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  29.00-30.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  30.00-31.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  31.00-32.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  32.00-33.00  sec   127 KBytes  1.04 Mbits/sec  91  
[  5]  33.00-34.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  34.00-35.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  35.00-36.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  36.00-37.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  37.00-38.00  sec   127 KBytes  1.04 Mbits/sec  91  
[  5]  38.00-39.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  39.00-40.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  40.00-41.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  41.00-42.00  sec   127 KBytes  1.04 Mbits/sec  91  
[  5]  42.00-43.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  43.00-44.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  44.00-45.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  45.00-46.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  46.00-47.00  sec   127 KBytes  1.04 Mbits/sec  91  
[  5]  47.00-48.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  48.00-49.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  49.00-50.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  50.00-51.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  51.00-52.00  sec   127 KBytes  1.04 Mbits/sec  91  
[  5]  52.00-53.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  53.00-54.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  54.00-55.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  55.00-56.00  sec   127 KBytes  1.04 Mbits/sec  91  
[  5]  56.00-57.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  57.00-58.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  58.00-59.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  59.00-60.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  60.00-61.00  sec   127 KBytes  1.04 Mbits/sec  91  
[  5]  61.00-62.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  62.00-63.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  63.00-64.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  64.00-65.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  65.00-66.00  sec   127 KBytes  1.04 Mbits/sec  91  
[  5]  66.00-67.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  67.00-68.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  68.00-69.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  69.00-70.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  70.00-71.00  sec   127 KBytes  1.04 Mbits/sec  91  
[  5]  71.00-72.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  72.00-73.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  73.00-74.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  74.00-75.00  sec   127 KBytes  1.04 Mbits/sec  91  
[  5]  75.00-76.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  76.00-77.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  77.00-78.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  78.00-79.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  79.00-80.00  sec   127 KBytes  1.04 Mbits/sec  91  
[  5]  80.00-81.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  81.00-82.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  82.00-83.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  83.00-84.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  84.00-85.00  sec   127 KBytes  1.04 Mbits/sec  91  
[  5]  85.00-86.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  86.00-87.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  87.00-88.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  88.00-89.00  sec   127 KBytes  1.04 Mbits/sec  91  
[  5]  89.00-90.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  90.00-91.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  91.00-92.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  92.00-93.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  93.00-94.00  sec   127 KBytes  1.04 Mbits/sec  91  
[  5]  94.00-95.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  95.00-96.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  96.00-97.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  97.00-98.00  sec   128 KBytes  1.05 Mbits/sec  92  
[  5]  98.00-99.00  sec   127 KBytes  1.04 Mbits/sec  91  
[  5]  99.00-100.00 sec   128 KBytes  1.05 Mbits/sec  92  
[  5] 100.00-101.00 sec   128 KBytes  1.05 Mbits/sec  92  
[  5] 101.00-102.00 sec   128 KBytes  1.05 Mbits/sec  92  
[  5] 102.00-103.00 sec   127 KBytes  1.04 Mbits/sec  91  
[  5] 103.00-104.00 sec   128 KBytes  1.05 Mbits/sec  92  
[  5] 104.00-105.00 sec   128 KBytes  1.05 Mbits/sec  92  
[  5] 105.00-106.00 sec   128 KBytes  1.05 Mbits/sec  92  
[  5] 106.00-107.00 sec   128 KBytes  1.05 Mbits/sec  92  
[  5] 107.00-108.00 sec   127 KBytes  1.04 Mbits/sec  91  
[  5] 108.00-109.00 sec   128 KBytes  1.05 Mbits/sec  92  
[  5] 109.00-110.00 sec   128 KBytes  1.05 Mbits/sec  92  
[  5] 110.00-111.00 sec   128 KBytes  1.05 Mbits/sec  92  
[  5] 111.00-112.00 sec   128 KBytes  1.05 Mbits/sec  92  
[  5] 112.00-113.00 sec   127 KBytes  1.04 Mbits/sec  91  
[  5] 113.00-114.00 sec   128 KBytes  1.05 Mbits/sec  92  
[  5] 114.00-115.00 sec   128 KBytes  1.05 Mbits/sec  92  
[  5] 115.00-116.00 sec   128 KBytes  1.05 Mbits/sec  92  
[  5] 116.00-117.00 sec   128 KBytes  1.05 Mbits/sec  92  
[  5] 117.00-118.00 sec   127 KBytes  1.04 Mbits/sec  91  
[  5] 118.00-119.00 sec   128 KBytes  1.05 Mbits/sec  92  
[  5] 119.00-120.00 sec   128 KBytes  1.05 Mbits/sec  92  
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Jitter    Lost/Total Datagrams
[  5]   0.00-120.00 sec  15.0 MBytes  1.05 Mbits/sec  0.000 ms  0/11015 (0%)  sender
[  5]   0.00-120.00 sec  15.0 MBytes  1.05 Mbits/sec  2.708 ms  0/11015 (0%)  receiver
root@router:~# iperf3 -6 -t 120 -p 5200 -c ping6.online.net
Connecting to host ping6.online.net, port 5200
[  5] local myipv6 port 58488 connected to 2001:bc8:1::40 port 5200
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec  4.88 MBytes  40.9 Mbits/sec    0    153 KBytes       
[  5]   1.00-2.00   sec  5.00 MBytes  41.9 Mbits/sec    0    153 KBytes       
[  5]   2.00-3.00   sec  5.00 MBytes  41.9 Mbits/sec    0    153 KBytes       
[  5]   3.00-4.00   sec  4.88 MBytes  40.9 Mbits/sec    0    153 KBytes       
[  5]   4.00-5.00   sec  5.00 MBytes  41.9 Mbits/sec    0    153 KBytes       
[  5]   5.00-6.00   sec  4.88 MBytes  40.9 Mbits/sec    0    153 KBytes       
[  5]   6.00-7.00   sec  5.00 MBytes  41.9 Mbits/sec    0    153 KBytes       
[  5]   7.00-8.00   sec  5.00 MBytes  41.9 Mbits/sec    0    153 KBytes       
[  5]   8.00-9.00   sec  4.88 MBytes  40.9 Mbits/sec    0    153 KBytes       
[  5]   9.00-10.00  sec  5.00 MBytes  41.9 Mbits/sec    0    153 KBytes       
[  5]  10.00-11.00  sec  4.62 MBytes  38.8 Mbits/sec    0    153 KBytes       
[  5]  11.00-12.00  sec  5.25 MBytes  44.0 Mbits/sec    0    238 KBytes       
[  5]  12.00-13.00  sec  4.88 MBytes  40.9 Mbits/sec    0    238 KBytes       
[  5]  13.00-14.00  sec  5.00 MBytes  41.9 Mbits/sec    0    238 KBytes       
[  5]  14.00-15.00  sec  4.88 MBytes  40.9 Mbits/sec    0    238 KBytes       
[  5]  15.00-16.00  sec  5.00 MBytes  41.9 Mbits/sec    0    238 KBytes       
[  5]  16.00-17.00  sec  5.00 MBytes  41.9 Mbits/sec    0    238 KBytes       
[  5]  17.00-18.00  sec  4.88 MBytes  40.9 Mbits/sec    0    238 KBytes       
[  5]  18.00-19.00  sec  5.00 MBytes  41.9 Mbits/sec    0    238 KBytes       
[  5]  19.00-20.00  sec  4.88 MBytes  40.9 Mbits/sec    0    238 KBytes       
[  5]  20.00-21.00  sec  5.12 MBytes  43.0 Mbits/sec    0    238 KBytes       
[  5]  21.00-22.00  sec  4.88 MBytes  40.9 Mbits/sec    0    238 KBytes       
[  5]  22.00-23.00  sec  5.00 MBytes  41.9 Mbits/sec    0    238 KBytes       
[  5]  23.00-24.00  sec  4.88 MBytes  40.9 Mbits/sec    0    238 KBytes       
[  5]  24.00-25.00  sec  5.00 MBytes  41.9 Mbits/sec    0    238 KBytes       
[  5]  25.00-26.00  sec  4.88 MBytes  40.9 Mbits/sec    0    238 KBytes       
[  5]  26.00-27.00  sec  5.00 MBytes  41.9 Mbits/sec    0    238 KBytes       
[  5]  27.00-28.00  sec  4.88 MBytes  40.9 Mbits/sec    1    166 KBytes       
[  5]  28.00-29.00  sec  4.62 MBytes  38.8 Mbits/sec    0    166 KBytes       
[  5]  29.00-30.00  sec  4.88 MBytes  40.9 Mbits/sec    0    166 KBytes       
[  5]  30.00-31.00  sec  5.00 MBytes  41.9 Mbits/sec    0    166 KBytes       
[  5]  31.00-32.00  sec  4.88 MBytes  40.9 Mbits/sec    0    166 KBytes       
[  5]  32.00-33.00  sec  5.00 MBytes  41.9 Mbits/sec    0    166 KBytes       
[  5]  33.00-34.00  sec  5.00 MBytes  41.9 Mbits/sec    0    166 KBytes       
[  5]  34.00-35.00  sec  4.88 MBytes  40.9 Mbits/sec    0    166 KBytes       
[  5]  35.00-36.00  sec  5.00 MBytes  41.9 Mbits/sec    0    166 KBytes       
[  5]  36.00-37.00  sec  5.00 MBytes  42.0 Mbits/sec    0    166 KBytes       
[  5]  37.00-38.00  sec  4.88 MBytes  40.9 Mbits/sec    0    166 KBytes       
[  5]  38.00-39.00  sec  5.00 MBytes  41.9 Mbits/sec    0    166 KBytes       
[  5]  39.00-40.00  sec  4.88 MBytes  40.9 Mbits/sec    0    166 KBytes       
[  5]  40.00-41.00  sec  5.00 MBytes  41.9 Mbits/sec    0    166 KBytes       
[  5]  41.00-42.00  sec  4.88 MBytes  40.9 Mbits/sec    0    166 KBytes       
[  5]  42.00-43.00  sec  5.00 MBytes  41.9 Mbits/sec    0    166 KBytes       
[  5]  43.00-44.00  sec  5.00 MBytes  41.9 Mbits/sec    0    166 KBytes       
[  5]  44.00-45.00  sec  4.88 MBytes  40.9 Mbits/sec    0    166 KBytes       
[  5]  45.00-46.00  sec  5.00 MBytes  41.9 Mbits/sec    0    166 KBytes       
[  5]  46.00-47.00  sec  5.00 MBytes  41.9 Mbits/sec    0    166 KBytes       
[  5]  47.00-48.00  sec  4.88 MBytes  40.9 Mbits/sec    0    166 KBytes       
[  5]  48.00-49.00  sec  5.00 MBytes  41.9 Mbits/sec    0    166 KBytes       
[  5]  49.00-50.00  sec  4.88 MBytes  40.9 Mbits/sec    0    166 KBytes       
[  5]  50.00-51.00  sec  5.00 MBytes  41.9 Mbits/sec    0    166 KBytes       
[  5]  51.00-52.00  sec  4.88 MBytes  40.9 Mbits/sec    0    166 KBytes       
[  5]  52.00-53.00  sec  4.50 MBytes  37.7 Mbits/sec    0    166 KBytes       
[  5]  53.00-54.00  sec  5.00 MBytes  41.9 Mbits/sec    0    166 KBytes       
[  5]  54.00-55.00  sec  5.00 MBytes  41.9 Mbits/sec    0    166 KBytes       
[  5]  55.00-56.00  sec  4.88 MBytes  40.9 Mbits/sec    0    166 KBytes       
[  5]  56.00-57.00  sec  5.00 MBytes  41.9 Mbits/sec    0    166 KBytes       
[  5]  57.00-58.00  sec  4.88 MBytes  40.9 Mbits/sec    0    166 KBytes       
[  5]  58.00-59.00  sec  5.00 MBytes  41.9 Mbits/sec    0    166 KBytes       
[  5]  59.00-60.00  sec  5.00 MBytes  41.9 Mbits/sec    0    166 KBytes       
[  5]  60.00-61.00  sec  4.88 MBytes  40.9 Mbits/sec    0    166 KBytes       
[  5]  61.00-62.00  sec  5.00 MBytes  41.9 Mbits/sec    0    166 KBytes       
[  5]  62.00-63.00  sec  4.88 MBytes  40.9 Mbits/sec    0    166 KBytes       
[  5]  63.00-64.00  sec  5.00 MBytes  41.9 Mbits/sec    0    166 KBytes       
[  5]  64.00-65.00  sec  4.88 MBytes  40.9 Mbits/sec    0    166 KBytes       
[  5]  65.00-66.00  sec  5.00 MBytes  42.0 Mbits/sec    0    166 KBytes       
[  5]  66.00-67.00  sec  4.88 MBytes  40.9 Mbits/sec    0    166 KBytes       
[  5]  67.00-68.00  sec  5.00 MBytes  41.9 Mbits/sec    0    166 KBytes       
[  5]  68.00-69.00  sec  4.88 MBytes  40.9 Mbits/sec    0    166 KBytes       
[  5]  69.00-70.00  sec  5.00 MBytes  41.9 Mbits/sec    0    166 KBytes       
[  5]  70.00-71.00  sec  5.00 MBytes  41.9 Mbits/sec    0    166 KBytes       
[  5]  71.00-72.00  sec  4.88 MBytes  40.9 Mbits/sec    0    166 KBytes       
[  5]  72.00-73.00  sec  5.00 MBytes  41.9 Mbits/sec    0    166 KBytes       
[  5]  73.00-74.00  sec  4.88 MBytes  40.9 Mbits/sec    0    166 KBytes       
[  5]  74.00-75.00  sec  4.50 MBytes  37.7 Mbits/sec    0    166 KBytes       
[  5]  75.00-76.00  sec  5.00 MBytes  41.9 Mbits/sec    0    166 KBytes       
[  5]  76.00-77.00  sec  4.88 MBytes  40.9 Mbits/sec    0    166 KBytes       
[  5]  77.00-78.00  sec  5.00 MBytes  41.9 Mbits/sec    0    166 KBytes       
[  5]  78.00-79.00  sec  4.88 MBytes  40.9 Mbits/sec    0    166 KBytes       
[  5]  79.00-80.00  sec  5.00 MBytes  41.9 Mbits/sec    0    166 KBytes       
[  5]  80.00-81.00  sec  5.00 MBytes  41.9 Mbits/sec    0    166 KBytes       
[  5]  81.00-82.00  sec  4.88 MBytes  40.9 Mbits/sec    0    166 KBytes       
[  5]  82.00-83.00  sec  5.00 MBytes  41.9 Mbits/sec    0    166 KBytes       
[  5]  83.00-84.00  sec  5.00 MBytes  41.9 Mbits/sec    0    166 KBytes       
[  5]  84.00-85.00  sec  4.88 MBytes  40.9 Mbits/sec    0    166 KBytes       
[  5]  85.00-86.00  sec  5.00 MBytes  41.9 Mbits/sec    0    166 KBytes       
[  5]  86.00-87.00  sec  4.88 MBytes  40.9 Mbits/sec    0    166 KBytes       
[  5]  87.00-88.00  sec  5.00 MBytes  41.9 Mbits/sec    0    166 KBytes       
[  5]  88.00-89.00  sec  4.88 MBytes  40.9 Mbits/sec    0    166 KBytes       
[  5]  89.00-90.00  sec  5.00 MBytes  41.9 Mbits/sec    0    166 KBytes       
[  5]  90.00-91.00  sec  4.88 MBytes  40.9 Mbits/sec    0    166 KBytes       
[  5]  91.00-92.00  sec  5.00 MBytes  41.9 Mbits/sec    0    166 KBytes       
[  5]  92.00-93.00  sec  4.88 MBytes  40.9 Mbits/sec    0    166 KBytes       
[  5]  93.00-94.00  sec  5.00 MBytes  41.9 Mbits/sec    0    166 KBytes       
[  5]  94.00-95.00  sec  5.00 MBytes  41.9 Mbits/sec    0    166 KBytes       
[  5]  95.00-96.00  sec  4.88 MBytes  40.9 Mbits/sec    0    166 KBytes       
[  5]  96.00-97.00  sec  5.00 MBytes  41.9 Mbits/sec    0    166 KBytes       
[  5]  97.00-98.00  sec  4.88 MBytes  40.9 Mbits/sec    0    166 KBytes       
[  5]  98.00-99.00  sec  5.00 MBytes  41.9 Mbits/sec    0    166 KBytes       
[  5]  99.00-100.00 sec  4.88 MBytes  40.9 Mbits/sec    0    166 KBytes       
[  5] 100.00-101.00 sec  5.00 MBytes  41.9 Mbits/sec    0    166 KBytes       
[  5] 101.00-102.00 sec  4.88 MBytes  40.9 Mbits/sec    0    166 KBytes       
[  5] 102.00-103.00 sec  5.00 MBytes  41.9 Mbits/sec    0    166 KBytes       
[  5] 103.00-104.00 sec  5.00 MBytes  41.9 Mbits/sec    0    166 KBytes       
[  5] 104.00-105.00 sec  4.88 MBytes  40.9 Mbits/sec    0    166 KBytes       
[  5] 105.00-106.00 sec  5.00 MBytes  41.9 Mbits/sec    0    166 KBytes       
[  5] 106.00-107.00 sec  4.88 MBytes  40.9 Mbits/sec    0    166 KBytes       
[  5] 107.00-108.00 sec  5.00 MBytes  41.9 Mbits/sec    0    166 KBytes       
[  5] 108.00-109.00 sec  4.88 MBytes  40.9 Mbits/sec    0    166 KBytes       
[  5] 109.00-110.00 sec  5.00 MBytes  41.9 Mbits/sec    0    166 KBytes       
[  5] 110.00-111.00 sec  4.88 MBytes  40.9 Mbits/sec    0    166 KBytes       
[  5] 111.00-112.00 sec  5.12 MBytes  43.0 Mbits/sec    0    261 KBytes       
[  5] 112.00-113.00 sec  4.88 MBytes  40.9 Mbits/sec    0    261 KBytes       
[  5] 113.00-114.00 sec  4.88 MBytes  40.9 Mbits/sec    0    261 KBytes       
[  5] 114.00-115.00 sec  5.00 MBytes  41.9 Mbits/sec    0    261 KBytes       
[  5] 115.00-116.00 sec  4.88 MBytes  40.9 Mbits/sec    0    261 KBytes       
[  5] 116.00-117.00 sec  4.88 MBytes  40.9 Mbits/sec    0    261 KBytes       
[  5] 117.00-118.00 sec  4.88 MBytes  40.9 Mbits/sec    0    261 KBytes       
[  5] 118.00-119.00 sec  4.88 MBytes  40.9 Mbits/sec    0    261 KBytes       
[  5] 119.00-120.00 sec  5.00 MBytes  41.9 Mbits/sec    0    261 KBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-120.00 sec   592 MBytes  41.4 Mbits/sec    1             sender
[  5]   0.00-120.00 sec   591 MBytes  41.3 Mbits/sec                  receiver

iperf Done.

ipv6 test seems to be ok as well

openwrt: OpenWrt 23.05.2 r23630-842932a63d / LuCI openwrt-23.05 branch git-23.306.39416-c86c256

hardware

  • Raspberry Pi 4 Model B Rev 1.4
  • TP-Link UE300 USB-ETH adapter
  • TP-Link Switch

config

BT & WIFI are disabled:

## disable wifi/bt
nano /boot/config.txt
## Disable Bluetooth
dtoverlay=disable-bt
## Disable Wi-Fi
dtoverlay=disable-wifi

green ethernet is disabled

nano /etc/hotplug.d/iface/10-ethtool
[ ifup = "$ACTION" ] || exit 0
[ -n "$DEVICE" ] || exit 0

if [ "$DEVICE" == eth0 ] || [ "$DEVICE" == eth1 ] ; then
      ethtool --set-eee "$DEVICE" eee off
fi

irqbalance is active

opkg install irqbalance
nano /etc/config/irqbalance
enabled 1
/etc/init.d/irqbalance start

sqm is enabled

# Download/Upload set to 90% speedtest
opkg install luci-app-sqm
Luci -> Link Layer Adaption -> Link layer -> Ethernet with overhead (my internet is cable)
Overhead: 42  (my speed is 1gbit)

bootrom is updated

root@router:~# rpi-eeprom-update -a
BOOTLOADER: up to date
   CURRENT: Tue Apr 26 10:24:28 UTC 2022 (1650968668)
    LATEST: Tue Apr 26 10:24:28 UTC 2022 (1650968668)
   RELEASE: stable (/lib/firmware/raspberrypi/bootloader/stable)
            Use raspi-config to change the release.

  VL805_FW: Using bootloader EEPROM
     VL805: up to date
   CURRENT: 000138a1
    LATEST: 000138a1

ipv6 prefix delegation

wan6 DHCP server settings are set to relay mode:

Designated master: enabled
RA-Service: relay
DHCPv6-Service: relay
NDP-Proxy: relay
Learn routes: enabled
IPv6 Prefix Lifetime: 24h

lan (br-lan) DHCP server settings are set to server mode:

Designated master: disabled
RA-Service: server
DHCPv6-Service: server
NDP-Proxy: relay
Learn routes: enabled
NDP Proxy Slave: enabled
IPv6 Prefix Lifetime: 24h

bcp38 is active

opkg install luci-app-bcp38
Luci -> Network -> Firewall -> BCP38 -> enabled