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5. Notes about DNS name resolution

Everytime you connect to an ISP, it is necesary to have configured DNS name resolution, so your computer can find IP addresses associated to a computer name.

IP addresses of your DNS servers are placed into the /etc/resolv.conf file.

In a standalone computer connecting to Internet, this file usually contains the IP addresses of your ISP's DNS servers:

#/etc/resolv.conf file for ISPname
nameserver 111.222.333.444
nameserver 222.333.444.555

In a proxy/firewall computer, this file usually contains its own IP address (or the loopback address,, and this computer includes a DNS server that translates DNS names to IP addresses by querying external DNS servers.

#/etc/resolv.conf file for local DNS resolution

Installation of a local DNS server is out of the scope of this document. There is a lot of documentation about this, but a good and quick approach can be found in the DNS-Howto (

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