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debian lenny , my favorite
a. vim  /etc/sysctl.conf:
    modify net.ipv4.ip_forward = 1
b. flush route table:
    iptables -F
    iptables -P INPUT ACCEPT
    iptables -P FORWARD ACCEPT
c. open NAT services:
    iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
that's all, your put step b in rc.local or bash.rc
let us enjoy it.


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