1. Is it a new DNS server box? If so, make sure you have a resolving
DNS, not an authoritative DNS, although both can co exist in one box.

2. Do you have firewall on both DNS,gateway and workstation? check if
indeed ping or/and other traffic are allowed.

3. Are the two machines (workstation and gateway) on the same network?
Make sure that the gateway has one NIC facing the 255.255.255.128
network.

note: You dont have to put DNS and gateway settings on the interface
facing the internal network.

4. If the resolving dns server is on another network, make sure that
your gateway actually allows you to query your dns server.

5. To verify that indeed you are NAT connected, traceroute to the
machine/device right after your gateway (this may be a modem/router/or
another gateway). This is again assuming  that your gateway allows
traceroute traffic. Otherwise your gateway may not allow NAT. Check if
you need to use proxy settings for internet connectivity.

6. apt-get uses the http_proxy environment variable to set proxy.

HTH.
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