hostname.em0

inet 174.136.101.210 255.255.255.252
inet6 2607:f2f8:a7b0::2 64

ifconfig em0

em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        lladdr 52:54:00:27:25:35
        priority: 0
        groups: egress
        media: Ethernet autoselect (1000baseT full-duplex)
        status: active
        inet6 fe80::5054:ff:fe27:2535%em0 prefixlen 64 scopeid 0x1
        inet6 2607:f2f8:a7b0::2 prefixlen 64
        inet 174.136.101.210 netmask 0xfffffffc broadcast 174.136.101.211

mygate

174.136.101.209
2607:f2f8:a7b0::1

nginx.conf

listen  80;
listen  [::]:80;

nsd.conf

server:
        ip-address: 174.136.101.210
        ip-address: 2607:f2f8:a7b0::2

sysctl net.inet6.ip6.v6only

net.inet6.ip6.v6only=1