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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, 127.0.0.1), 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
nameserver 127.0.0.1
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 (
http://www.linuxdoc.org/HOWTO/DNS-HOWTO.html ).
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