I guess I haven't explained it properly, but I'm not sure If I can do any
better than this.
When the machine with the ethernet card having the mac address of
00:e0:98:03:9d:7b requests an IP, the dhcp server will lookup the hostname
piglet.lhsw.com (where the dns server will look in the hosts file first
and in this case finds it is 192.168.1.6) and assigns it to that
machine/nic. If it cannot find this hostname's IP, it will assign one from
the pool (so you have to either have this name in your hosts file, or be
resolveable by dns some other way)
Is this clearer, or have I misunderstood the question?
charles
On Thu, 27 Jan 2000, Bret Hughes wrote:
> Very cool. But I still don't get how the addresses for fixed address
> hosts get resolved.
>
> Bret
>
> Charles Galpin wrote:
> >
> > On Thu, 27 Jan 2000, Bret Hughes wrote:
> >
> > > Are you using host files for the internal machine resolution? I use a
> > > local dns for my internal network so I don't have to change all the
> > > hostfiles every time I add a machine to the netowork. I think there is
> > > a DHCP tie to dns somehow I guess I need to read up.
> >
> > Oh, I should have said that by running a caching only name server, and
> > telling the clients to use it, and having the search/resolve order to be
> > the hosts file first, you get to do exactly this. You have one hosts file
> > to maintain!. In addition, if you have clients that you would like to
> > always get the same IP, you would let them conenct once, get their mac
> > address and enter something like this to keep them gettign the same
> > name/ip.
> >
> > host piglet {
> > hardware ethernet 00:e0:98:03:9d:7b;
> > fixed-address piglet.lhsw.com;
> > }
> >
> > where in /etc/hosts I have
> >
> > 192.168.1.6 piglet piglet.lhsw.com
> >
> > SO eaxch client does not have to have anything (except localhost) in their
> > hosts file. All dns queries go to your dns sevrer who has th emaster hosts
> > file, and asks your isp for anything it doesn't know how to resolve :)
> >
> > hth
> > charles
> >
> > > I was also thinking about the ip address conflict that I found last
> > > night and the fact that none of the logs showed anything was wrong. The
> > > windows box had a msg box indicating there was a conflict but nothing on
> > > any of the linux boxes. Is there some thing I can run that will check
> > > for ip address conflicts? I guess I could use tcpdump and check the arp
> > > calls for a different hardware address but that seems rather hit or miss
> > > and I am certainly not script guru.
> >
> > using dhcp, you would definatley know if there was a confilict (but
> > wouldn't have any conflicts unless using a mix of static and dynamic
> > clients)
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