Re: Problem sharing ADSL connection from D-Link DSL-300T
From: rpm (news_at_16hd.freeserve.co.uk)
Date: 08/03/04
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Date: Tue, 03 Aug 2004 12:48:19 +0100
Hi Sean,
>>First, I assume that the DSL router is connected using an ethernet cable
>>(cat 5).
It is. Tried swapping cables, too.
>>
>>The router gets an IP address from your ISP's DHCP server and you already
>>have or can choose to set a fixed IP on the LAN leg of the router.
>>
>>If this is the case then I would recommend that the external interface
>>(eth0) is set to a static IP on the same subnet as the internal leg of
>>your DSL router. Set pri and sec dns values to that of your ISP.
Done
>>
>>See if you can ping between eth0 and the internal leg of your DSL router.
>>If you can then proceed.
Yes, works fine with numeric addresses
>>
>>Next set a fixed IP to the eth1 leg (internal to your LAN). Make sure it's
>>on the same subnet as your LAN hosts. Set pri and sec dns values to that
>>of your ISP.
Yes, done
>>
>>See if you can ping to hosts in your LAN.
Yes
>>
>>At this point you still will not be able to ping from a LAN host across
>>both routers. So if you ping www.suse.com you will probably get a message
>>that the network is not reachable.
Correct!
>>
>>Start a shell session on the host you are using as a router. Login as root
>>su
>>password
>>
>>Check that the value for IP_FORWARD=yes
>>>>echo 1 > /proc/sys/net/ipv4/ip_forward
both done, re-booted
>>
>>OK exit the shell, restart the firewall and try to ping the world from one
>>of your LAN hosts. It should work. If not check that all settings use the
>>ISP DNS and that your firwall is configured with the correct internal and
>>external cards.
Ping to Demonīs DNS servers works, but ping e.g. www.google.com just hangs
>>Hope this helps.
>>
>>
/var/log/messages shows no dropped / illegal packets (unlike previous
post) but I see a number of references there to IPV6 not being supported
(?) also a few "martian source" reports. Unsurpisingly real apps (e.g.
firefox) don't work either.
One possible issue: The D-Link DSL-300T is configured via browser
(self-contained web server inside the box). This offers setup, status
and test pages - status shows 'connected' with small numbers of packets
counted in the link. Test functions are cryptically named "F4 End" or
somesuch (I don't have it in front of me) and of the 4, 2 pass and 2
fail. No documentation to determine what the failure might mean. I will
try the d-link tech support...
I suppose my key question is: have you (or anyone else reading this!)
any clue why the DNS servers can be pinged but aren't working as DNS?
I'm completely baffled.
Thanks for your help,
Richard
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