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LXC 客户机使用的虚拟网络接口上的网关

tag-icon • tag-icon networking debian iptables gateway
LXC 客户机使用的虚拟网络接口上的网关

我目前在配置虚拟网络接口的网关时遇到一些问题。

以下是我所做的：

我创建了一个虚拟网络接口：

# brctl addbr lxc0
# brctl setfd lxc0 0
# ifconfig lxc0 192.168.0.1 promisc up
# route add -net default gw 192.168.0.1 lxc0

输出ifconfig给了我想要的东西：

lxc0      Link encap:Ethernet  HWaddr 22:4f:e4:40:89:bb  
          inet adr:192.168.0.1  Bcast:192.168.0.255  Masque:255.255.255.0
          adr inet6: fe80::88cf:d4ff:fe47:3b6b/64 Scope:Lien
          UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
          RX packets:623 errors:0 dropped:0 overruns:0 frame:0
          TX packets:7412 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 lg file transmission:0 
          RX bytes:50329 (49.1 KiB)  TX bytes:335738 (327.8 KiB)

我配置dnsmasq为提供一个 DNS 服务器（使用默认的：）192.168.1.1和一个 DHCP 服务器。

然后，我的 LXC 客户机配置如下：

lxc.network.type=veth
lxc.network.link=lxc0
lxc.network.flags=up

一切都运行正常，我的容器有一个 IP（192.168.0.57和192.168.0.98）。我可以从容器和主机 ping 主机和容器：

(host)# ping -c 3 192.168.0.114
PING 192.168.0.114 (192.168.0.114) 56(84) bytes of data.
64 bytes from 192.168.0.114: icmp_req=1 ttl=64 time=0.044 ms
64 bytes from 192.168.0.114: icmp_req=2 ttl=64 time=0.038 ms
64 bytes from 192.168.0.114: icmp_req=3 ttl=64 time=0.043 ms

--- 192.168.0.114 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 1998ms
rtt min/avg/max/mdev = 0.038/0.041/0.044/0.007 ms

(guest)# ping -c 3 192.168.0.1
PING 192.168.0.1 (192.168.0.1) 56(84) bytes of data.
64 bytes from 192.168.0.1: icmp_req=1 ttl=64 time=0.048 ms
64 bytes from 192.168.0.1: icmp_req=2 ttl=64 time=0.042 ms
64 bytes from 192.168.0.1: icmp_req=3 ttl=64 time=0.042 ms

--- 192.168.0.1 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 1999ms
rtt min/avg/max/mdev = 0.042/0.044/0.048/0.003 ms

现在，是时候将主机配置为网络网关了192.168.0.0/24：

#!/bin/sh

# Clear rules
iptables -F
iptables -t nat -F
iptables -t mangle -F
iptables -X

iptables -A FORWARD -i lxc0 -o eth0 -j ACCEPT
iptables -A FORWARD -i eth0 -o lxc0 -m state --state ESTABLISHED,RELATED -j ACCEPT
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

echo 1 > /proc/sys/net/ipv4/ip_forward

最后的测试彻底失败了，ping 外面：

(guest)# ping -c 3 google.fr
PING google.fr (173.194.67.94) 56(84) bytes of data.
From 192.168.0.1: icmp_seq=3 Redirect Host(New nexthop: wi-in-f94.1e100.net (173.194.67.94))
From 192.168.0.1 icmp_seq=1 Destination Host Unreachable
From 192.168.0.1 icmp_seq=2 Destination Host Unreachable
From 192.168.0.1 icmp_seq=3 Destination Host Unreachable

--- google.fr ping statistics ---
3 packets transmitted, 0 received, +3 errors, 100% packet loss, time 2017ms

我是否遗漏了什么？

答案1

我最终通过使用这个 iptables 规则让它工作起来：

#!/bin/sh

# Clear rules
iptables -F
iptables -t nat -F
iptables -t mangle -F
iptables -X

iptables -t nat -A POSTROUTING -s 192.168.0.0/24 -o eth0 -j MASQUERADE

echo 1 > /proc/sys/net/ipv4/ip_forward

-s src_net缺少该选项。

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