tigersrv: 
tailscale up --accept-routes=true --accept-dns=false --advertise-routes=192.168.2.0/24 --reset


DERP_IP="115.190.55.84"
openssl req -x509 -newkey rsa:4096 -sha256 -days 3650 -nodes -keyout ${DERP_IP}.key -out ${DERP_IP}.crt -subj "/CN=${DERP_IP}" -addext "subjectAltName=IP:${DERP_IP}"

derper --hostname="115.190.55.84" -certmode manual -certdir /root/derp --verify-clients

    "derpMap": {
        "OmitDefaultRegions": true,  
        "Regions": {
            "901": {
                "RegionID":   901,
                "RegionCode": "bj",
                "RegionName": "Volc Engine",
                "Nodes": [
                    {
                        "Name":     "901a",
                        "RegionID": 901,
                        "HostName":         "eksoft", //这个随便写
                        "IPv4":             "115.190.55.84", //改成自己的IP
                        "InsecureForTests": true,
                    },
                ],
            },
        },
    },