pf 阻止的所有 IPv6 流量

以下pf.conf（FreeBSD 10.3）似乎阻止了所有 IPv6 流量，我不知道為什麼。

tcp_inbound = "{ ssh, domain, http, https }"
tcp_outbound = "{ domain, http, https, imaps, smtps }"

udp_services = "{ domain, ntp }"

block all
pass proto udp to any port $udp_services keep state
pass out proto tcp to any port $tcp_outbound keep state
pass in proto tcp to any port $tcp_inbound keep state

# from https://help.github.com/articles/what-ip-addresses-does-github-use-that-i-should-whitelist/
table <github> { 192.30.252.0/22, 2620:112:3000::/44 }
pass out proto tcp to <github> port { ssh } keep state

pass proto icmp from any to any

如何在允許 IPv4 的相同服務上允許 IPv6 流量？我添加inet6了每個規則的顯式版本，但似乎沒有幫助。如果我禁用pf，那麼 IPv6 流量可以正常通過。

通過啟用日誌記錄，我發現這是因為 ICMP6 路由器請求被阻止了。添加

pass proto ipv6-icmp from any to any

到文件末尾修復了問題。

引用自：https://serverfault.com/questions/805579