linux – 转发IPv6流量

发布时间：2020-12-13 17:55:40 所属栏目：Linux 来源：网络整理

导读：如何将IPv6流量从tun0接口转发到eth0接口？使用ifconfig： eth0 Link encap:Ethernet HWaddr 00:16:3E:12:77:54 inet addr:208.111.39.160 Bcast:208.111.39.255 Mask:255.255.255.0 inet6 addr: 2607:f740:0:3f::eda/64 Scope:Global inet6 addr: fe80::21

如何将IPv6流量从tun0接口转发到eth0接口？

使用ifconfig：

eth0      Link encap:Ethernet  HWaddr 00:16:3E:12:77:54  
          inet addr:208.111.39.160  Bcast:208.111.39.255  Mask:255.255.255.0
          inet6 addr: 2607:f740:0:3f::eda/64 Scope:Global
          inet6 addr: fe80::216:3eff:fe12:7754/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:65590 errors:0 dropped:499 overruns:0 frame:0
          TX packets:40111 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:13246038 (12.6 MiB)  TX bytes:28807669 (27.4 MiB)
          Interrupt:29 

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)

tun0      Link encap:UNSPEC  HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  
          inet addr:10.8.0.1  P-t-P:10.8.0.2  Mask:255.255.255.255
          inet6 addr: 2607:f740:44:22::8/64 Scope:Global
          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1500  Metric:1
          RX packets:16876 errors:0 dropped:0 overruns:0 frame:0
          TX packets:16504 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100 
          RX bytes:2235766 (2.1 MiB)  TX bytes:7680377 (7.3 MiB)

我已启用转发：

[root@baobei ~]# sysctl net.ipv6.conf.all.forwarding
net.ipv6.conf.all.forwarding = 1

防火墙：

ip6tables -F INPUT
ip6tables -F FORWARD
ip6tables -F OUTPUT
ip6tables -F 

ip6tables -P INPUT ACCEPT
ip6tables -P FORWARD ACCEPT
ip6tables -P OUTPUT ACCEPT

echo -n "1" >/proc/sys/net/ipv6/conf/all/forwarding
echo -n "1" >/proc/sys/net/ipv6/conf/all/proxy_ndp
echo -n "0" >/proc/sys/net/ipv6/conf/all/autoconf
echo -n "0" >/proc/sys/net/ipv6/conf/all/accept_ra
ip6tables -A INPUT -p icmpv6 -j ACCEPT
ip6tables -A FORWARD -m state --state NEW -i tun0 -o eth0 -s 2607:f740:44:22::/64 -j ACCEPT
ip6tables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT

路线：

unreachable ::/96 dev lo  metric 1024  error -101
unreachable ::ffff:0.0.0.0/96 dev lo  metric 1024  error -101
unreachable 2002:a00::/24 dev lo  metric 1024  error -101
unreachable 2002:7f00::/24 dev lo  metric 1024  error -101
unreachable 2002:a9fe::/32 dev lo  metric 1024  error -101
unreachable 2002:ac10::/28 dev lo  metric 1024  error -101
unreachable 2002:c0a8::/32 dev lo  metric 1024  error -101
unreachable 2002:e000::/19 dev lo  metric 1024  error -101
2607:f740:0:3f::/64 dev eth0  proto kernel  metric 256 
2607:f740:44:22::/64 dev tun0  proto kernel  metric 256 
unreachable 3ffe:ffff::/32 dev lo  metric 1024  error -101
fe80::/64 dev eth0  proto kernel  metric 256 
fe80::/64 dev tun0  proto kernel  metric 256 
default via 2607:f740:0:3f::1 dev eth0  metric 1

但是,到达tun0接口的ipv6数据包不会路由到eth0接口.感谢您的帮助,建议.

解决方法

这是一个简单的路由问题.您的路由表没有任何通过tun0接口引导流量的路由,因此不会以任何方式转发.

我知道你正在使用OpenVPN.据我所知,对OpenVPN的IPv6支持不包括与redirect-gateway选项相当的IPv6.您可能需要使用从服务器推送的route-ipv6语句添加自己的路由.

（编辑：李大同）

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