esxi下的debian主机突然出现ping ipv6 地址无法到达,ping unreachable。输入ip -6 route,发现没有默认的ipv6网关。
于是,首先在/etc/sysctl.conf里添加一条:
net.ipv6.conf.default.autoconf=0
再来,输入nano /etc/network/interfaces,内容如下,其中fe80::20c:29ff:fee8:fe65
为网关爱快或者其它的内网ipv6地址,加入dns-nameservers行及最后一行,指定ipv6 dns服务器和默认网关:

source /etc/network/interfaces.d/*

# The loopback network interface
auto lo
iface lo inet loopback
iface lo inet6 loopback
# The primary network interface
allow-hotplug ens192
iface ens192 inet static
address 192.168.2.110
netmask 255.255.255.0
gateway 192.168.2.3

iface ens192 inet6 dhcp
dns-nameservers 2001:4860:4860::8888 2001:4860:4860::8844

up ip route replace default via fe80::20c:29ff:fee8:fe65 dev ens192

最后输入
netstat -rn -A inet6可以看到了如下:

Destination                    Next Hop                   Flag Met Ref Use If
::1/128                        ::                         U    256 2     0 lo
2409:8a20:b686:d3a1::23c/128   ::                         U    256 2     0 ens192
fe80::/64                      ::                         U    256 2     0 ens192
fe80::/64                      ::                         U    256 1     0 zt6ovqfnrp
fe80::/64                      ::                         U    256 1     0 docker0
fe80::/64                      ::                         U    256 1     0 veth11d86e9
fe80::/64                      ::                         U    256 1     0 vetha42d0c2
fe80::/64                      ::                         U    256 1     0 vethd4bf991
::/0                           fe80::20c:29ff:fee8:fe65   UG   1024 5     0 ens192

输入ip -6 route,可以看到如下:

::1 dev lo proto kernel metric 256 pref medium
2409:8a20:b686:d3a1::23c dev ens192 proto kernel metric 256 pref medium
fe80::/64 dev ens192 proto kernel metric 256 pref medium
fe80::/64 dev zt6ovqfnrp proto kernel metric 256 pref medium
fe80::/64 dev docker0 proto kernel metric 256 pref medium
fe80::/64 dev veth11d86e9 proto kernel metric 256 pref medium
fe80::/64 dev vetha42d0c2 proto kernel metric 256 pref medium
fe80::/64 dev vethd4bf991 proto kernel metric 256 pref medium
default via fe80::20c:29ff:fee8:fe65 dev ens192 metric 1024 pref medium

说明本机到网关ipv6路由已经打通,此时ping到ipv6网站已经通了


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sontjer

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