On Wed, Dec 8, 2010 at 11:04 PM, Someone <[email protected]> wrote:
>
> On Wed, 2010-12-08 at 20:59 -0800, drew wymore wrote:
>> On Wed, Dec 8, 2010 at 7:58 PM, someone <[email protected]> wrote:
>>
>> > The advanced tab seems to be password locked and apparently I wasn't
>> > given the password.  Question is, how do I get around the fact the the
>> > cable modem wants
>> > to set a global ip address on the host via dhcp?  This clearly would
>> > mess up my Linux based routers.  In Linux, can I limit what dhcp from
>> > the cable modem can change?  I want to set a default route in say the
>> > Comcast routing table based on what the cable modem tells me instead
>> > of setting this route in the default routing table.  Is there a
>> > modified dhcp client that works with this cable modem which will use
>> > the information the modem provides and apply it appropriately?
>> >
>>
>> Not that I'm aware of. Comcast gear is basically bridge Michael. So you'll
>> have to set up a box as a router at the iface that the Comcast router plugs
>> into.
>
> So what do I need to know?  Can I add a nic to my statically configured
> gateway and plug the comcast modem into it or am I stuck putting a
> router appliance inbetween my Linux router and the cable modem?  The
> problem is, if /etc/resolv.conf gets changed that messes things up.
> I also don't want the default route in the default routing table to
> change.  Unless...  What if I create a separate routing table for
> each Internet connection and mark all packets that are outbound so that
> it doesn't matter what the default Internet route in the default routing
> table is?  I still have the issue of protecting /etc/resolv.conf though.

you can add a file that will be used via the dhclient process
dhclient.conf or on some systems dhclient.<interface>

In that file you add names domain and can either prepend or append.
http://linux.about.com/od/commands/l/blcmdl5_dhclien.htm
or use your friendly man page
man dhclient.conf
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