Thanks for the great info. That does help quite a bit.

On Mon, Apr 8, 2013 at 7:05 AM, Ondřej Hošek <[email protected]> wrote:

> The IP tells the server which network interface to use: LAN, WiFi, ... One
> of these interfaces is the "loopback interface", the virtual device that
> provides access to, among others, 127.0.0.1. It tends to be called "lo".
>
> Unless there have been massive changes recently, the Linux server decides
> which interface to use by default by resolving your hostname. Most systems
> are set up to first consult /etc/hosts and then DNS.
>
> Let's assume my machine is called "caesar". Its fully qualified domain
> name would be "caesar.local" (unless I have an actual domain; then I can
> use that). If the following line is in /etc/hosts:
> 127.0.0.1 caesar.local caesar
> then hlds will bind to the loopback interface, making external connections
> impossible. If, on the other hand, I go for
> 192.168.123.45 caesar.local caesar
> where 192.168.123.45 is the IP address I have on my LAN, then hlds will
> bind to the LAN interface and accept incoming connections. (Your router
> forwards datagrams arriving at your external address to your server's
> internal address; hlds mostly need not worry about the external address.)
>
> This default choice ("I resolve my own hostname") can be overridden using
> the CVar "ip".
>
> Note that it is IMPORTANT that the first hostname of each entry in
> /etc/hosts is fully qualified, otherwise the magic described above won't
> work.
> 192.168.123.45 caesar.local caesar
> is fine,
> 192.168.123.45 caesar caesar.local
> or
> 192.168.123.45 caesar
> are not.
>
> Also, you can add multiple aliases:
>
> 192.168.123.45 caesar.local caesar gaius caius
>
> Note that if you type in your external IP address, hlds will protest
> simply because your server has no network card with that address.
>
> Hope this clears things up.
>
> Cheers,
> ~~ Ondra
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