1.9.14 does not bind 8555 UDP on IPv6 stack.

[ytugarev]

I use Frigate 0.17-Beta2 (native go2rtc 1.9.10) and had #1890 issue.
Successfully updated to 1.9.14 via standard Frigate process https://docs-dev.frigate.video/configuration/advanced/#custom-go2rtc-version without any issues. For external access I would like to try IPv6 ( 0 nat, I have working stack end-2-end) and my Frigate has routable IPv6 address.

When do

  webrtc:
    listen: ":8555" #:8555 #192.168.50.154:8555 Using :8555 usually binds to both IPv4 (0.0.0.0) and IPv6 ([::]) if available.
    filters:
      network: [udp4, tcp4, udp6, tcp6] # Ensure all are enabled
    #candidates:
    #  - 192.168.50.154:8555            # Internal IPv4
    #  - "[2001:9b1:4296:d700::5]:8555" # Direct IPv6

I get

root@nanopc:/opt# docker exec frigate lsof -iUDP -P -n | grep go2rtc
go2rtc  128 root    8u  IPv4 21837513      0t0  UDP 192.168.50.154:8555 
go2rtc  128 root    9u  IPv4 21837519      0t0  UDP 192.168.50.154:5353 
go2rtc  128 root   10u  IPv4 21837520      0t0  UDP *:5353 
root@nanopc:/opt# docker exec frigate lsof -iTCP -P -n | grep go2rtc
go2rtc     128 root    5u  IPv6 21838439      0t0  TCP *:8554 (LISTEN)
go2rtc     128 root    6u  IPv6 21839462      0t0  TCP *:1984 (LISTEN)
go2rtc     128 root    7u  IPv6 21837510      0t0  TCP *:8555 (LISTEN)
go2rtc     128 root   11u  IPv6 21837735      0t0  TCP 127.0.0.1:8554->127.0.0.1:53272 (ESTABLISHED)
go2rtc     128 root   12u  IPv6 21843079      0t0  TCP 127.0.0.1:8554->127.0.0.1:53282 (ESTABLISHED)
go2rtc     128 root   13u  IPv6 21842378      0t0  TCP 127.0.0.1:8554->127.0.0.1:53288 (ESTABLISHED)
go2rtc     128 root   15u  IPv6 21841712      0t0  TCP 127.0.0.1:8554->127.0.0.1:53290 (ESTABLISHED)
go2rtc     128 root   17u  IPv6 21882591      0t0  TCP 192.168.50.154:1984->192.168.50.3:49200 (ESTABLISHED)

So UDP is v4 and TCP is v6. Why? Am I missing anything?

[AlexxIT]

You need to enable debug logging for the webrtc module. This will display a list of network interfaces available to go2rtc.

[ytugarev]

Haha, initial logs I shared above were taking with this conf (Frigate).

logs:
    # frigate.comms: debug    
    # GO2RTC (EMBEDDED)    
    go2rtc: debug    
    # BIRDSEYE    
    # frigate.birdseye: debug    
    # NOTIFICATIONS    
    # frigate.notifications: debug    
    # EMBEDDINGS & SEMANTIC SEARCH    
    # frigate.embeddings: debug    
    # CAMERA SPECIFIC (replace camera_name)    
    # frigate.camera.camera_name: debug
# Optional: IPv6 configuration
networking:  
  ipv6:
    enabled: true

According to https://docs.frigate.video/configuration/advanced/#go2rtc-logging I need something like this is go2rtc section.

go2rtc:
  log:
    webrtc: debug
  
  streams:
    # Only main stream through go2rtc....

This helps, indeed

info | 2026-01-31 20:09:14 | startup | Preparing new go2rtc config...
info | 2026-01-31 20:09:15 | WARN    | Using go2rtc binary from '/config/go2rtc' instead of the embedded one
info | 2026-01-31 20:09:15 | startup | Starting go2rtc...
info | 2026-01-31 20:09:15 | startup | go2rtc platform=linux/arm64 revision=b5948cf version=1.9.14
info | 2026-01-31 20:09:15 | startup | config path=/config/go2rtc_homekit.yml
info | 2026-01-31 20:09:15 | api     | listen addr=:1984
info | 2026-01-31 20:09:15 | rtsp    | listen addr=:8554
info | 2026-01-31 20:09:15 | webrtc  | interface {Index:1 MTU:65536 Name:lo HardwareAddr: Flags:up|loopback|running} addrs [127.0.0.1/8 ::1/128]
info | 2026-01-31 20:09:15 | webrtc  | interface {Index:246 MTU:1500 Name:eth0 HardwareAddr:de:26:78:d0:d1:6b Flags:up|broadcast|multicast|running} addrs [192.168.50.154/24 <PublicMACbasedV6>/64 <localULAMacbasedV6>/64 <PublicGlobalUnicastV6>/64<LinkLocalV6>/64]
info | 2026-01-31 20:09:15 | webrtc  | listen tcp addr=[::]:8555
info | 2026-01-31 20:09:15 | webrtc  | listen udp addr=192.168.50.154:8555
info | 2026-01-31 20:09:23 | startup | Starting go2rtc healthcheck service...

I use Native v6 with DHCP-PD from my ISP, on a Docker side - macvlans (so every container has its own v4 and v6 addresses)

Also

root@nanopc:/opt# docker inspect frigate | grep -i ipv4
                        "IPv4Address": "192.168.50.154"
root@nanopc:/opt# docker inspect frigate | grep -i ipv6
                    "IPv6Gateway": "<MyGwV6inPublicFormat>",
                    "GlobalIPv6Address": "<PublicGlobalUnicastV6>",
                    "GlobalIPv6PrefixLen": 64,