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  • 配置centos6.0为Router

    1.ETH0--LAN

    [root@server ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0
    DEVICE=eth0
    HWADDR=00:XX:XX:00:97:XX
    ONBOOT=yes
    TYPE=Ethernet
    BOOTPROTO=none
    IPADDR=192.168.0.254
    NETMASK=255.255.255.0

    2.EHT1--WAN

    [root@server ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth1
    DEVICE=eth1
    HWADDR=00:XX:XX:00:97:XX
    ONBOOT=yes
    BOOTPROTO=none
    TYPE=Ethernet
    IPADDR=58.240.XX.IP
    NETMASK=255.255.255.240
    GATEWAY=58.240.XX.GW

    3.sysctl

    [root@server ~]# cat /etc/sysctl.conf
    # Kernel sysctl configuration file for Red Hat Linux
    #
    # For binary values, 0 is disabled, 1 is enabled.  See sysctl(8) and
    # sysctl.conf(5) for more details.

    # Controls IP packet forwarding
    net.ipv4.ip_forward = 1

    ... ...

    [root@server ~]# sysctl -p
    net.ipv4.ip_forward = 1

    4.SNAT

    [root@server ~]# iptables -t nat -A POSTROUTING -s 192.168.0.0/24 -o eth1 -j SNAT --to 58.240.XX.IP
    or

    [root@server ~]# iptables -t nat -A POSTROUTING -o eth1 -j MASQUERADE

    保存SNAT配置:

    [root@server ~]# /etc/init.d/iptables save

    [root@server ~]# cat /etc/sysconfig/iptables
    # Generated by iptables-save v1.4.7 on Fri Mar 30 14:10:34 2012
    *filter
    :INPUT ACCEPT [19774:1796237]
    :FORWARD ACCEPT [2088:205908]
    :OUTPUT ACCEPT [4335:25558058]
    COMMIT
    # Completed on Fri Mar 30 14:10:34 2012
    # Generated by iptables-save v1.4.7 on Fri Mar 30 14:10:34 2012
    *nat
    :PREROUTING ACCEPT [152787:30285172]
    :POSTROUTING ACCEPT [4:236]
    :OUTPUT ACCEPT [9:586]

    #-A POSTROUTING -s 192.168.0.0/24 -o eth1 -j SNAT --to 58.240.XX.IP
    -A POSTROUTING -o eth1 -j MASQUERADE

    COMMIT
    # Completed on Fri Mar 30 14:10:34 2012

    打完,收工。

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  • 原文地址:https://www.cnblogs.com/xia/p/2425196.html
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