Re: [gentoo-user] Re: static IP, gateway and netmask setting

[Etaoin Shrdlu]

On Wednesday 28 November 2007, Dan Farrell wrote:

> How the net init script works (there's really only one, generally
> net.* is linked to net.lo for update simplicity)

That script only calls functions defined elsewhere. The hard (and 
module-dependent) work is done by the files located 
in /lib/rcscripts/net. In particular, /lib/rcscripts/net/iproute2.sh 
and /lib/rcscripts/net/ifconfig.sh define all the various *_up(), 
*_down(), *_add_address(), etc. functions that are invoked by net.lo.
 
> /etc/conf.d/net.example holds examples for just
> about every imaginable configuration, but from my net, iproute2 looks
> something like:
>
> modules=("iproute2");
> config_eth0=( "192.168.1.87/24 brd 192.168.1.255");
> routes_eth0=( "default via 192.168.1.1" );
> config_eth1=( "192.168.1.88/24 brd 192.168.1.255" );
>
> but as you can see, that still doesn't set up a netmask but uses the
> default.

What I see is that you are explicitly specifying the netmask. The /24 in 
your lines specifies the netmask. Even if you didn't, in your case 
things would probably still work, because iproute2 would probably use a 
class C netmask, which is also /24. But nonetheless you are not 
using "the default" (whatever this means), but are instead explicitly 
specifying a netmask.

> I agree that in both cases the default would be /8 for a
> 10.xxx network, but as you can see the config syntax is different for
> iproute2 and ifconfig.

As I understand it, the syntax is exactly the same. What is different are 
the commands that are run behind the scenes to configure the interfaces, 
and these depend on the module you choose (iproute2 or ifconfig). In 
other words, if you substituted modules=("iproute2") with 
modules=("ifconfig") in your etc/conf.d/net, everything would still work 
as expected.
The lack of a netmask specification will result in the tool used for the 
configuration (ifconfig or iproute2) doing whatever is appropriate for 
it: usually, this would just mean "use the default classful netmask",
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