What should the "/etc/resolv.conf" file contain? [SOLVED]

[MasterX]

Until today I thought that the /etc/resolv.conf file holds the DNS addresses of the ISP. I have a 2Mbps connection, and I know that I am connected at that speed because I am able to download files at the speed of ~150KB/s. But, when I am trying to visit a web page or use to emerge command to fetch a file things get pretty slow.
I believe that this is because the /etc/resolv.conf does not contain the right information. I have contacted the ISP customer support and they have given me their DNS addresses, which I copied them in this file. At the end of the file, I have the ip address of the router.

Is there something else that I need to add in this file?

[Hopeless]

It should be "nameserver ip address", however you can set this in /etc/conf.d/net and it'll automatically generate resolve.conf.

For example, you could just set dns_servers_eth0="192.168.1.254" in the net conf file.
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[MasterX]

@Hopeless, thank you for your reply. I am using the syntax that you mentioned. I did not know that I could set the DNS from the /etc/conf.d/net file. I will give it a try...

I just can not understand how is it possible to download a file with 150KB/s and emerge can not fetch some files (these files do exist on the server, because if I copy paste their URL to Kget, they will be downloaded in a couple of seconds).

If this is not a problem with the DNS address, then what else could cause this behavior..

BTW, I am using a wifi modem/router

[Dagger]

to speed it up you might want to install some light dns cache. dnsmasq should do just fine. It's working pretty good for me on a mail server which is bombarded with over 15k emails per hour, and needs to SPF check every single one.
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[MasterX]

[Dagger]

By default dns is requested from DHCP server and overwrites your resolv.conf

You might also take a look on net-dns/resolvconf-gentoo and reemerge dnsmasq with resolv.conf
It sorted my problems with overwriting resolv.conf from VPN.
(thanks UberLord!)
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[MasterX]