Problem setting up wired networking

Anne Wilson cannewilson at googlemail.com
Tue Nov 11 20:59:27 UTC 2008


On Tuesday 11 November 2008 20:36:26 Michal Jaegermann wrote:
> On Tue, Nov 11, 2008 at 07:39:36PM +0000, Anne Wilson wrote:
> > On Tuesday 11 November 2008 17:31:22 Michal Jaegermann wrote:
> > > On Tue, Nov 11, 2008 at 07:40:14AM +0000, Anne Wilson wrote:
> > > > Networking is the one aspect of Fedora that always confuses me.
> > > > It seems to me that on a laptop I want/need NetworkManager to work
> > > > with wifi wherever I am working.
> > >
> > > Usually wifi gets its addresses through DHCP and you want for
> > > that NetworkManager running.
> > >
> > > > OTOH, at home I would generally want to work with wired.
> > >
> > > If you are in control of a corresponding DHCP server (a big IF) then
> > > the the easiest way is to, _on that server_, lock up a particular IP
> > > number to a MAC address of a wired interface of your laptop,
>
> ....
>
> > My router does handle dhcp, and yes, you can reserve addresses.
>
> Very good.
>
> > Unfortunately
> > it seems to be aware of the present conflict.  It lists the new laptop
> > with the dhcp address, but when I tell it that I want it to reserve a
> > different address (the one that I gave to NM) it tells me that that
> > address already exists.
>
> I think that you misconfigured something.
>
> On your router:
>    - ask it to give always the same address for a specific MAC
>      (which will be a MAC of a wired interface of your laptop)
>    - that address you want to reserve should be from a pool of
>      addresses which your router gives out via DHCP
>    - if this is a wireless router then you can reseve an address for
>      your laptop wifi interface too and that will be a different MAC
>      and a different address than above

I would try this again, but since I have lost the wifi altogether I don't have 
a mac address to give it.  It does, however, see the cabled connection at the 
address I gave NM.

> On your laptop:
>    - configure your wired interface to be handled by DHCP and that
>      means that you do NOT give any specific address; it will always
>      get one you reserved on your router anyway
>    - let NM handle all interfaces; i.e. 'BOOTPROTO=dhcp' and
>      'NM_CONTROLLED=yes' for every interface configuration file.
>    - 'service network stop; chkconfig network off' and make sure
>      that NM service is on and running
>
> That is the simplest and the most flexible - in a sense.  It only
> depends on capabilities of your DHCP server but you are telling that
> yours is "good enough".
>
> Your router, quite sensibly, may not like to reserve an address
> which is already in use; especially if it was not given out by a
> DHCP lease.  It sounds like a resonable sanity checking. :-)
>
> > If I reserve the address I could use dhcp.  I want a static
> > address, one way or another, so that when I read the logs I know
> > which computer it is referring to.
>
> Nominally this address will be not "static" as it will require
> a DHCP lease; but with the above it will be always the same.
>
Practically, the same, so I'd be happy with that.

Anne

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