netmask in a script

[Dazed_75]

I'm not trying to configure network interfaces, I am actually extracting the
current IP address and netmask FROM ifconfig.  What I want to do is apply
the netmask to the current IP in order to update /etc/dnsmasq.conf's value
to the DHCP range it should proxy for in a portable PXE server.

IOW, the IP of the PXE server is dynamic between different environments and
dnsmasq is used so the PXE server does not need to be a DHCP server in
whatever network it is attached to today.

On Wed, Oct 26, 2011 at 10:23 PM, Nathan England <nathan at paysonlinux.org>wrote:

> On Wednesday, October 26, 2011 21:49:40 Dazed_75 wrote:
> > I would like to apply a netmask to an arbitrary IP in a bash/dash script
> > (e.g. apply 255.255.255.0 to 173.10.3.155 to get 173.10.3.0).  Is there
> any
> > easy way to do that without taking the IP apart, doing 4 operations and
> > reassembling the results?
>
>
> does executing
>
> ifconfig DEVICE_NAME 173.10.3.155 netmask 255.255.255.0
>
> give you the desired results?
>
>
> Nathan
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-- 
Dazed_75 a.k.a. Larry

The spirit of resistance to government is so valuable on certain occasions,
that I wish it always to be kept alive.
  - Thomas Jefferson
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