保姆级图文教程：
https://kejimm.com/87.html
关键步骤：
编辑文件：/etc/network/interfaces，添加：
auto vmbr1
iface vmbr1 inet static
address 10.1.1.1/24
bridge-ports none
bridge-stp off
bridge-fd 0
iface vmbr1 inet6 static
address 2001:****:****:cf5a::2/64
post-up iptables -t nat -A POSTROUTING -s ‘10.1.1.1/24’ -o vmbr0 -j MASQUERADE
pre-down iptables -t nat -D POSTROUTING -s ‘10.1.1.1/24’ -o vmbr0 -j MASQUERADE
post-up /sbin/ip -f inet6 route add 2001:****:****:cfff:ff:ff:ff:ff dev vmbr0
pre-down /sbin/ip -f inet6 route del 2001:****:****:cfff:ff:ff:ff:ff dev vmbr0
post-up /sbin/ip -f inet6 route add default via 2001:****:****:cfff:ff:ff:ff:ff
pre-down /sbin/ip -f inet6 route del default via 2001:****:****:cfff:ff:ff:ff:ff
post-up /sbin/ip -f inet6 neigh add proxy 2001:****:****:cf5a::2 dev vmbr1
pre-down /sbin/ip -f inet6 neigh del proxy 2001:****:****:cf5a::2 dev vmbr1
post-up /sbin/ip -f inet6 neigh add proxy 2001:****:****:cf5a::100 dev vmbr0
pre-down /sbin/ip -f inet6 neigh del proxy 2001:****:****:cf5a::100 dev vmbr0
文件/etc/sysctl.conf添加：
net.ipv4.ip_forward=1
net.ipv6.conf.all.forwarding=1
net.ipv6.conf.all.proxy_ndp = 1
net.ipv6.conf.default.forwarding = 1
net.ipv6.conf.vmbr0.autoconf=0
net.ipv6.conf.vmbr0.accept_ra=2
小鸡IPV6网关：2001:****:****:cf5a::2
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