CentOS7下如何配置ip forward(虚拟路由器)

考证与结婚

linux 中ip forward功能是一个比较方便实用的功能，只需要简单配置，添加几条路由，即可实现ip转发。本文基于centos 7下采取一台机器充当虚拟路由，来实现windows环境与linux环境中相互通信。具体见下文，供大家参考。

一、环境及需求说明

本地测试环境，由于win7+vmware这台机器网卡太新，无法被vmware exsi识别，无奈之下就直接装了个win7，然后再上面基于vmware workstation 12开启了一些临时测试的虚拟机。其次本地直连网段192.168.1.0 ip有限，而又希望直接从本机(如图win10) ssh连接到这些虚拟机，因此考虑使用linux的ip转发功能来实现。

上述图片中已经列出了各个节点的ip信息，红色的虚拟机充当软路由，配置好之后，实现win10 直接ssh到虚拟机。

二、虚拟路由服务器配置

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###查看网卡信息 [root@centos7-router ~]# ip addr 1: lo: <loopback,up,lower_up> mtu 65536 qdisc noqueue state unknown   link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00   inet 127.0.0.1/8 scope host lo    valid_lft forever preferred_lft forever   inet6 ::1/128 scope host    valid_lft forever preferred_lft forever 2: eno16777728: <broadcast,multicast,up,lower_up> mtu 1500 qdisc pfifo_fast state up qlen 1000   link/ether 00:0c:29:9c:eb:2d brd ff:ff:ff:ff:ff:ff   inet 172.24.8.254/24 brd 172.24.8.255 scope global eno16777728    valid_lft forever preferred_lft forever   inet6 fe80::20c:29ff:fe9c:eb2d/64 scope link    valid_lft forever preferred_lft forever 3: eno33554960: <broadcast,multicast,up,lower_up> mtu 1500 qdisc pfifo_fast state up qlen 1000   link/ether 00:0c:29:9c:eb:37 brd ff:ff:ff:ff:ff:ff   inet 192.168.1.175/24 brd 192.168.1.255 scope global dynamic eno33554960    valid_lft 82384sec preferred_lft 82384sec   inet6 fe80::20c:29ff:fe9c:eb37/64 scope link    valid_lft forever preferred_lft forever   ###查看路由表 [root@centos7-router ~]# route -n kernel ip routing table ###缺省情况下，每块网卡都有一个基于本网段的路由记录 destination  gateway    genmask    flags metric ref  use iface 0.0.0.0    192.168.1.1  0.0.0.0    ug  100  0    0 eno33554960 172.24.8.0   0.0.0.0    255.255.255.0 u  100  0    0 eno16777728 192.168.1.0  0.0.0.0    255.255.255.0 u  100  0    0 eno33554960   ###使用ip命令方式查看路由 [root@centos7-router ~]# ip route list default via 192.168.1.1 dev eno33554960 proto static metric 100 172.24.8.0/24 dev eno16777728 proto kernel scope link src 172.24.8.254 metric 100 192.168.1.0/24 dev eno33554960 proto kernel scope link src 192.168.1.175 metric 100   ###开启ip forward [root@centos7-router ~]# cp /usr/lib/sysctl.d/50-default.conf /usr/lib/sysctl.d/50-default.conf.bk [root@centos7-router ~]# echo "net.ipv4.ip_forward = 1" >>/usr/lib/sysctl.d/50-default.conf [root@centos7-router ~]# grep ip_forward /usr/lib/sysctl.d/50-default.conf net.ipv4.ip_forward = 1 [root@centos7-router ~]# sysctl -p ###如不生效重启一下os

三、centos7-a主机下添加路由

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###查看当前主机ip 信息 [root@centos7-a ~]# ip addr list 1: lo: <loopback,up,lower_up> mtu 65536 qdisc noqueue state unknown   link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00   inet 127.0.0.1/8 scope host lo    valid_lft forever preferred_lft forever   inet6 ::1/128 scope host    valid_lft forever preferred_lft forever 2: eno16777728: <broadcast,multicast,up,lower_up> mtu 1500 qdisc pfifo_fast state up qlen 1000   link/ether 00:0c:29:57:26:9d brd ff:ff:ff:ff:ff:ff   inet 172.24.8.131/24 brd 172.24.8.255 scope global dynamic eno16777728    valid_lft 1088sec preferred_lft 1088sec   inet6 fe80::20c:29ff:fe57:269d/64 scope link    valid_lft forever preferred_lft forever   ###查看当前主机路由信息   [root@centos7-a ~]# ip route list 172.24.8.0/24 dev eno16777728 proto kernel scope link src 172.24.8.131 metric 100   [root@centos7-a ~]# # author : leshami [root@centos7-a ~]# # blog : http://blog.csdn.net/leshami [root@centos7-a ~]# ip route add default via 172.24.8.254 [root@centos7-a ~]# ip route list default via 172.24.8.254 dev eno16777728 172.24.8.0/24 dev eno16777728 proto kernel scope link src 172.24.8.131 metric 100   ###测试到虚拟路由器网关ip连通性 [root@centos7-a ~]# ping 172.24.8.254 -c 2       ping 172.24.8.254 (172.24.8.254) 56(84) bytes of data. 64 bytes from 172.24.8.254: icmp_seq=1 ttl=64 time=0.268 ms 64 bytes from 172.24.8.254: icmp_seq=2 ttl=64 time=0.302 ms   --- 172.24.8.254 ping statistics --- 2 packets transmitted, 2 received, 0% packet loss, time 1000ms rtt min/avg/max/mdev = 0.268/0.285/0.302/0.017 ms   ###测试到虚拟路由器ip连通性 [root@centos7-a ~]# ping 192.168.1.175 -c 2 ping 192.168.1.175 (192.168.1.175) 56(84) bytes of data. 64 bytes from 192.168.1.175: icmp_seq=1 ttl=64 time=0.475 ms 64 bytes from 192.168.1.175: icmp_seq=2 ttl=64 time=0.443 ms   --- 192.168.1.175 ping statistics --- 2 packets transmitted, 2 received, 0% packet loss, time 1000ms rtt min/avg/max/mdev = 0.443/0.459/0.475/0.016 ms

四、windows 10下配置路由

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###当前环境 c:\>systeminfo | findstr build os version:        10.0.14393 n/a build 14393 os build type:      multiprocessor free   ###查看当前的路由信息 c:\>route print -4 =========================================================================== interface list  7...54 ab 3a xx b8 ea ......intel(r) ethernet connection i219-v 21...ac 2b 6e 5f 3b 57 ......microsoft wi-fi direct virtual adapter             ...... =========================================================================== ipv4 route table =========================================================================== active routes: network destination    netmask     gateway   interface metric      0.0.0.0     0.0.0.0   192.168.1.1  192.168.1.242  35     127.0.0.0    255.0.0.0    on-link    127.0.0.1  331     127.0.0.1 255.255.255.255    on-link    127.0.0.1  331  127.255.255.255 255.255.255.255    on-link    127.0.0.1  331    172.24.10.0  255.255.255.0    on-link   172.24.10.1  291    172.24.10.1 255.255.255.255    on-link   172.24.10.1  291   172.24.10.255 255.255.255.255    on-link   172.24.10.1  291    192.168.1.0  255.255.255.0    on-link  192.168.1.242  291   192.168.1.242 255.255.255.255    on-link  192.168.1.242  291   192.168.1.255 255.255.255.255    on-link  192.168.1.242  291   192.168.16.0  255.255.255.0    on-link   192.168.16.1  291   192.168.16.1 255.255.255.255    on-link   192.168.16.1  291  192.168.16.255 255.255.255.255    on-link   192.168.16.1  291     224.0.0.0    240.0.0.0    on-link    127.0.0.1  331     224.0.0.0    240.0.0.0    on-link  192.168.1.242  291     224.0.0.0    240.0.0.0    on-link   192.168.16.1  291     224.0.0.0    240.0.0.0    on-link   172.24.10.1  291  255.255.255.255 255.255.255.255    on-link    127.0.0.1  331  255.255.255.255 255.255.255.255    on-link  192.168.1.242  291  255.255.255.255 255.255.255.255    on-link   192.168.16.1  291  255.255.255.255 255.255.255.255    on-link   172.24.10.1  291 =========================================================================== persistent routes:  none   ###添加持久化路由 c:\>route add 172.24.8.0 mask 255.255.255.0 192.168.1.175 -p ok!   c:\>route print -4   ipv4 route table =========================================================================== active routes: network destination    netmask     gateway   interface metric      0.0.0.0     0.0.0.0   192.168.1.1  192.168.1.242  35     127.0.0.0    255.0.0.0    on-link    127.0.0.1  331     127.0.0.1 255.255.255.255    on-link    127.0.0.1  331  127.255.255.255 255.255.255.255    on-link    127.0.0.1  331    172.24.8.0  255.255.255.0  192.168.1.175  192.168.1.242  36    172.24.10.0  255.255.255.0    on-link   172.24.10.1  291    172.24.10.1 255.255.255.255    on-link   172.24.10.1  291   172.24.10.255 255.255.255.255    on-link   172.24.10.1  291    192.168.1.0  255.255.255.0    on-link  192.168.1.242  291   192.168.1.242 255.255.255.255    on-link  192.168.1.242  291   192.168.1.255 255.255.255.255    on-link  192.168.1.242  291   192.168.16.0  255.255.255.0    on-link   192.168.16.1  291   192.168.16.1 255.255.255.255    on-link   192.168.16.1  291  192.168.16.255 255.255.255.255    on-link   192.168.16.1  291     224.0.0.0    240.0.0.0    on-link    127.0.0.1  331     224.0.0.0    240.0.0.0    on-link  192.168.1.242  291     224.0.0.0    240.0.0.0    on-link   192.168.16.1  291     224.0.0.0    240.0.0.0    on-link   172.24.10.1  291  255.255.255.255 255.255.255.255    on-link    127.0.0.1  331  255.255.255.255 255.255.255.255    on-link  192.168.1.242  291  255.255.255.255 255.255.255.255    on-link   192.168.16.1  291  255.255.255.255 255.255.255.255    on-link   172.24.10.1  291 =========================================================================== persistent routes: ###以下为添加的持久化路由记录  network address     netmask gateway address metric    172.24.8.0  255.255.255.0  192.168.1.175   1 ===========================================================================

五、验证两边连通性

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###从linux端ping windows 10 [root@centos7-a ~]# ping 192.168.1.242 -c 2   ping 192.168.1.242 (192.168.1.242) 56(84) bytes of data. 64 bytes from 192.168.1.242: icmp_seq=1 ttl=63 time=1.70 ms 64 bytes from 192.168.1.242: icmp_seq=2 ttl=63 time=1.10 ms   --- 192.168.1.242 ping statistics --- 2 packets transmitted, 2 received, 0% packet loss, time 1002ms rtt min/avg/max/mdev = 1.101/1.404/1.707/0.303 ms   ###从windows 10端ping linux c:\>ping 172.24.8.131 -t   pinging 172.24.8.131 with 32 bytes of data: reply from 172.24.8.131: bytes=32 time=1ms ttl=63 reply from 172.24.8.131: bytes=32 time=1ms ttl=63

注，如果测试有问题，请考虑是否被防火墙拦住。

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。

原文链接：http://blog.csdn.net/leshami/article/details/78123995?utm_source=tuicool&utm_medium=referral