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I have two PCs, the host one is connected with the public network, and it has two network cards, and one is connected the public network via the DHCP, and the other PC only has one network card, and it is connected with the host's second network card via a cable. And the host and the client both are Ubuntu Desktop 12.04. Now I want to share the host's public network with the client PC, I set the host's second network card IP address is and I can not edit the configuration of the client PC's network, because it's network connections applet is missing. I opened it in the Applications --> System Tools --> Administration --> Network Tools, it shows the eth1, But I cannot edit its configuration.

Could you give me some advice about how to share the host's public network with the client PC? Thanks.

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