Macbook Air 2012 / Connecting To Ethernet Network?

Sep 3, 2012

I'm trying to connect my macbook air to a university Ethernet network. I'm using the apple thunderbolt to ethernet adaptor to connect, and it registers a connection in the network preferences, with an IP address and subnet mask number. However, it wont fill the router name, the DNS server number or the search domains fields.When I use google chrome to load a webpage it doesn't load, stating that a DNS lookup has failed.How do I get connected?

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Macbook Air, OSX 10.8.1, on a home network under a Cisco/Linksys WRT110 router, internet via Optimum cable modem TM822G. Other PCs are W7 and XP, plus an iPad, iPhone & droid.

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Running OS X 10.5.8 on an old MacBook Pro on a wireless network. It might be relevant that I recently upgraded the wireless router and the DHCP-assigned IP addresses changed. Before that, everything worked reasonably well.

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[PC1] -----10G------[PC2]------10G------< Hardware Switch >
| | | | |
1G 1G 1G 1G 1G
| | | | |
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As you can see in the simplified picture above, I have a real switch which has a single 10G link that is connected to PC2. I would like to add the 10G cards to PC2 so that I can create a "switch" of 10G ports on PC2 which I can then hook up other clients (such as PC1 in the above picture).

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