tailscale 自建 derp stun IPV6 no, but OS has support 不工作

Access controls：

{ "randomizeClientPort": true, "derpMap": { "OmitDefaultegions":true, "Regions": { "900": { "RegionID": 900, "RegionCode": "GZ", "RegionName": "tencent", "Nodes": [{ "Name": "a", "RegionID": 900, "HostName": "ts-derp.xxx.com", "DERPPort": 443, }]}, }}, "nodeAttrs": [ { "target": ["*"], "ipPool": ["100.64.18.0/24"], }, ], } 

1 、使用自建 DERP ，OmitDefaultRegions:True 屏蔽官方节点开启 结果：IPV4 stun 正常，ipv6 no, but OS has support

tailscale netcheck --verbose 2025/09/02 12:34:49 netcheck: sent to x.x.x.x:3478 2025/09/02 12:34:49 netcheck: sent to [2402:4e00:xxxx:xxxx:xxxxxx]:3478 2025/09/02 12:34:49 portmap: [v1] Got PMP response; IP: 192.168.30.251, epoch: 2383592 2025/09/02 12:34:49 portmap: [v1] Got PCP response: epoch: 2383592 2025/09/02 12:34:49 netcheck: received STUN packet from x.x.x.x:3478 2025/09/02 12:34:49 netcheck: received STUN packet from [2402:4e00:xxxx:xxxx:xxxxxx]:3478 2025/09/02 12:34:49 portmap: [v1] UPnP reply {Location:http://192.168.31.1:5351/rootDesc.xml Server:MiWiFi/x UPnP/1.1 MiniUPnPd/2.1 USN:uuid:5c324c80-1fff-4fae-997b-abbbf977de89::urn:schemas-upnp-org:device:InternetGatewayDevice:1}, "HTTP/1.1 200 OK\r\nCACHE-CONTROL: max-age=120\r\nST: urn:schemas-upnp-org:device:InternetGatewayDevice:1\r\nUSN: uuid:5c324c80-1fff-4fae-997b-abbbf977de89::urn:schemas-upnp-org:device:InternetGatewayDevice:1\r\nEXT:\r\nSERVER: MiWiFi/x UPnP/1.1 MiniUPnPd/2.1\r\nLOCATION: http://192.168.31.1:5351/rootDesc.xml\r\nOPT: \"http://schemas.upnp.org/upnp/1/0/\"; ns=01\r\n01-NLS: 1754400791\r\nBOOTID.UPNP.ORG: 1754400791\r\nCONFIGID.UPNP.ORG: 1337\r\n\r\n" 2025/09/02 12:34:49 portmap: UPnP meta changed: [{Location:http://192.168.31.1:5351/rootDesc.xml Server:MiWiFi/x UPnP/1.1 MiniUPnPd/2.1 USN:uuid:5c324c80-1fff-4fae-997b-abbbf977de89::urn:schemas-upnp-org:device:InternetGatewayDevice:1}] 2025/09/02 12:34:49 netcheck: portMap done 2025/09/02 12:34:49 netcheck: [v2] attempting to do captive portal detection on interface en0 2025/09/02 12:34:49 netcheck: [v2] 2 available captive portal detection endpoints; trying 2 2025/09/02 12:34:49 netcheck: captivedetection: failed to set IP_BOUND_IF (ifIndex=14): invalid argument 2025/09/02 12:34:49 netcheck: captivedetection: failed to set IP_BOUND_IF (ifIndex=14): invalid argument 2025/09/02 12:34:49 netcheck: DetectCaptivePortal(found=false) 2025/09/02 12:34:49 netcheck: [v1] report: udp=true v6=false v6os=true mapvarydest=true portmap=UMC v4a=x.x.x.x:7651 captiveportal=false derp=900 derpdist=900v4:14ms 2025/09/02 12:34:49 netcheck: GetReport took 770ms; err=<nil> Report: * Time: 2025-09-02T04:34:49.905493Z * UDP: true * IPv4: yes, x.x.x.x:7651 * IPv6: no, but OS has support * MappingVariesByDestIP: true * PortMapping: UPnP, NAT-PMP, PCP * CaptivePortal: false * Nearest DERP: * DERP latency: - tencent-derp: 13.7ms (derp900, ) 

2 、使用自建 DERP ，OmitDefaultRegions:False 屏蔽官方节点关闭 结果：IPV4 stun 正常，ipv6 正常

3 、使用官方节点，默认配置 OmitDefaultRegions:True 结果：IPV4 stun 正常，ipv6 正常

可能会是什么原因呢？