one gateway two subnet routing

Discussion in 'Server Operation' started by paulley, Sep 4, 2010.

  1. paulley

    paulley New Member

    Hi all,

    I am trying to set a linux router as such so i can route the internet connection on one nic, to two other networks (subnets). What i have done so far is setup this:

    eth2 ----------router----------internet

    eth0 -------------- vlan 2 on web managed switch ------ clients > 10

    eth1 -------------- vlan 3 on web managed switch ------ clients > 10

    I have got a dhcp server running with 2 scopes to assign ip's for each clients on the different subnets which this works great and i can ping the gateway ip for that subnet, all im having a problem with is how to route the gateway to the internet to the eth0 and 1 ip's so i can use these ip's for the gateway and dns ip's to connect to the internet.

    I have ip_forward on and tried the route and ip route commands but these didnt work

    Any help with this will be great

    Last edited: Sep 4, 2010
  2. pwn

    pwn New Member

    You need to enable masquerading under iptables.

    iptables -t nat -A POSTROUTING -o eth2 -j MASQUERADE

    off the top of my head...IIRC

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