🚀 go-pugleaf

On Fri, 27 Jun 2008 14:58:53 -0700 (PDT), BigAl.NZ@gmail.com wrote:

(chop...)

>Sound it sounds like things are actually working the way they should,
>albeit thats not nessecarily the way I want them to work?

Yep.  I had a fast lunch today with a real live genuine expert on
ethernet and networking.  I managed to squeeze in your problem and got
the same answer that I supplied.  DHCP clients have no way to know
that the DHCP server has issued a new lease.  He indicated that I
should use a keep alive script, similar to what I suggested.

Short form version:  It's not going to get easily fixed.

>Perhaps I should :
>(a) make my ADSL connection more reliable so it doesnt disconnect
>(b) Set the 502T to PPPoA mode and turn on DHCP, and make it a DMZ.

Neither.  You should find out WHY your ISP is dropping the lease on
short notice with only a minimum disconnect.  The ISP should retain
the old lease for at least an hour or two, which means you should be
able to disconnect for about an hour and still get the same IP address
as before.  It's even scribbled into the RFC's somewhere (I'm not
going to risk my sanity by reading RFC's at this time), that the DHCP
server should store the leases for some time, and not re-issue an old
one until the lease expires.  If you're ISP issues 24 hour leases (a
common number), then you should get back the same IP even after a 23.9
hr disconnection.  In orther words, it's NOT your problem, it's your
ISP's problem.  Do some testing and complain if a short disconnect
results in a immediate change in IP address.

The easiest way to test this is to temporarily remove DD-WRT from the
picture.  Just plug a computah into the DSL modem and get the IP
directly from the ISP's server.  Note the lease time.  Now, unplug the
DSL modem and see what happens.  It should give you back the same IP.

>I would then get the 502T to assign 10.1.1.3 to the DD-WRT and the DMZ
>would make sure all traffic goes to the DD-WRT? I guess its still a
>kind of double NAT? I suppose I could make the LAN side of the 502T
>static IP with 10.1.1.3?

Don't bother.  The problem is at the WAN side and probably at the ISP.
Double NAT isn't going to help.

Incidentally, make sure your DSL modem doesn't have an "inactivity
timeout" feature.  If it has a keep alive, turn it on.  Do whatever it
takes to keep the modem online full time.

>My aim here is to make the DD-WRT do all the work, and just have the
>502T terminate the connection and pass everything on to the DD-WRT
>where all the firewalls, acess restrictions and port forwards are
>setup.

That's the way it's suppose to work.  Disarm all the fancy features in
the 502T and turn it into a simple DSL->ethernet bridge.

-- 
# Jeff Liebermann 150 Felker St #D Santa Cruz CA 95060
# 831-336-2558            jeffl@comix.santa-cruz.ca.us
# http://802.11junk.com               jeffl@cruzio.com
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