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i've a ubuntu server (13.04) with 3 NICs. This is my routing table:

Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
default         vodafone.statio 0.0.0.0         UG    0      0        0 p1p1
192.168.8.0     *               255.255.255.0   U     0      0        0 p2p2
192.168.17.0    *               255.255.255.0   U     0      0        0 p2p1

The server is on the interet and sees the 2 subnets. My PC is on subnet 17.xxx, i can ping all PCs on the subnet 8.xxx but i can't go on the internet.

How can i configure the routing table to redirect my request on the web?

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If you can ping from one subnet to another, there's no problem in your routing table. Probably packets from local networks are being sent to Internet unmodified. The problem is that private network addresses are not routable through Internet.

Private network addresses must be NAT'ed before sent to Internet. Try running:

sudo iptables -t nat -A POSTROUTING -o p1p1 -j MASQUERADE
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