Hi Again folks.
Something I still don't understand that I need clarified, how exactly does DNS
interact
with ipmasq. I have done a lot of reading (how-to's, faq's, books on dns, ipmasq etc)
and
am still confused
here is the situation
I build a samba file server for my Windows Network (95,98 and NT), I use myhome.com
as my domain and assign addresses in the 192.168.1.xxx class. I put all the names and
ip addresses of all the computers in the /etc/hosts file on the samba server. I point
all
the other machines to the samba box for dns services and to make doubly sure I fill
the
host.sam file on the windows boxes with the same info as in the the linux /etc/hosts.
I
am not running bind or any other dns software.
2 machines used for this test
win98box.myhome.com (192.1689.1.6)
sambabox.myhome.com (192.168.1.2)
One day I get ADSL or Cable service and decide I want to use this samba box to dish
out internet services to all my windows boxes. I recompile the kernel to include all
the
stuff necessary for ipmasq, make sure both ethernet cards are setup correctly and that
one of the cards (in this case eth1) gets assigned the appropriate info via dhcp from
the
adsl service. So far so good. I make sure to setup all windows boxes to use the linux
boxes eth0 (internal network) as it's default gateway. The only rules I use for
ipfwadm are
ipfwadm -F -p deny
ipfwadm -F -a m -S192.168.1.0/24 -D 0.0.0.0/0
If sit down at the ipfwadm console, I can happily ping and get out and about on the
net. I
can ping the window's machines from the linux box and ping the linux box from the
windows machines when I use the ipaddress. I can even ping eth1 from the windows
boxes if I type its dhcp assigned address in
If I try using the names of the machines with ping, it fails, ie if I type
ping sambabox from the win98 box, it fails with host unknown, if I type ping
192.168.1.2,
the ping works fine. Then if I type the ping win98box, the ping works fine just as it
does if
I type ping 192.168.1.6.
If i run the same 2 pings (using the names) on the linux machine, all works as it
should.
If I then go back to the the win98 box and ping a known site on the net using its ip
address I instantly get back request timed out, if I then use the name of this site,
it sits
there for about a minute or 2 then comes back with unknown host.
Looking in the /etc/resolv.conf file I see the dns server info as assigned by dhcp.
So.... after all the, my main question is how does my windows machine really know
what dns to use? If it goes by the the info in the hosts.sam file, as far as it knows
there
are only a few machines on the 192.168.1.xxx domain, if it goes by info in /etc/hosts
file
on linux box, same situation, now if it goes via the dns servers as listed in
/etc/resolv.conf that seems like it would work. But fowarding doesn't work from the
win98 box. trying to ping anyting on the net or surf teh web, doesn't work. The fact
that I
can ping the external nic on the samba/router box from the win98box by using its dhcp
assigned adress really confuses me as it says to me that forwarding is working.....
So how do I get this DNS thing sorted out? I am pretty sure after all the reading I've
done
that the problem is DNS related, but I haven't a clue how to solve this.
TIA
Harondel J. Sibble
Sibble Computer Consulting
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