Hi I have the following equipment:

dsl --- zyxel modem/router ---- usr8054 router -.-.-.- computers
                    \---- wired computers

[Long description if my diagram is not clear: the first modem/router (a
Zyxel 600) receives the dsl signal from the phone jack; connected to this
first router, there is a second router (USR, wireless) and some wired
computers; other computer are unwired and connect through the second
router.]


My question: does the usr8054 modem need to have fixed ip address, or can it
be configured to receive an ip address through DHCP from the zyxel modem?

Thanks.

Belga <be***@nomail.net> wrote in
Yes, it can be cofigured for DHCP. Any particular reason you're using two
routers? You should be able to setup the USR Router as a pure AP.

You missed some vital information: is the USR router connected to the Zyxel
one via the USR's WAN port or one of the LAN ports? Unless you have a good
reason to do otherwise, it would probably be better to use a LAN port.

Also, what is the IP address and subnet mask of the Zyxel router?

If it's connected by the WAN port, the WAN-side address can be assigned by
DHCP. If it's connected by a LAN port, the WAN-side address is irrelevant.
The LAN-side address can probably only be a fixed address in either case,
but it needs to be a fixed address.

Alex

Alex Fraser wrote:

Show quoteHide quoteOK thanks for the reply. I'm using the USR's WAN connexion, I don't see why
using the LAN would be better. I can't reply to the IP address/mask
question now, I'm not at my office and I don't remember that.

Show quote Hide quote If you connect the two routers together by their LAN ports, then wired and
wireless machines will all be part of the same network. Assuming the Zyxel
router has four LAN ports (I know the USR does), what you end up with is
virtually equivalent to a 6-port wireless router (one LAN port on each
router is taken up by the connection between them).

If you connect the USR's WAN port to one of the Zyxel's LAN ports, computers
attached to the Zyxel will not be able to access computers "attached" (wired
or wireless) to the USR, and computers attached to the USR may have problems
accessing computers attached to the Zyxel. (Also, the USR's LAN-side
interface and DHCP server must be configured with different addresses to the
Zyxel's.)

I'll assume the former is preferable for you, and that the router's LAN-side
address and subnet mask are 192.168.1.1/255.255.255.0. What you need to do
is is match Jeff Gaines' description: turn off the DHCP server on the USR
and give it a LAN-side address in the same range as (but different to) the
Zyxel, eg 192.168.1.2. You will probably find it easiest to do this using a
computer wired to the USR, with the USR not connected to anything else at
the time.

You may need a cross-over cable to go between the two routers (you can buy
adapters to make normal cables into cross-over and vice-versa). Most routers
these days automatically detect the cable type, so this may not matter.
Check the manuals for the routers.

Ideally you should also configure the DHCP server on the Zyxel so that it
will never offer the address of the USR router. In practice you will
probably have no problems even if you don't bother.

HTH,
Alex

It helped a lot Alex, thanks for the explanations.

On 03/03/2005 Belga wrote:

Show quoteHide quoteI had a setup like this with 2 x Linksys routers. I set a fixed address
of 192.168.1.1 on the first (the Zyxel for you) and 192.168.1.2 on the
second (your USR). I had DHCP on for the first (i.e. Zyxel) and off for
the second (i.e. USR).

Apart from anything else it makes the admin of the routers easier if
their IP addresses are fixed.

Belga wrote:

I have a Zyxel 624r and this is able to provide dhcp to hosts on the
LAN, no prob. Have you looked at the Zyxel site for your router's
reference manual?

On Thu, 03 Mar 2005 22:51:59 GMT, in alt.internet.wireless , Nig
<n**@nigs.niet> wrote:

not very many routers can be DHCP clients on the LAN side. I'm not sure it
makes much sense - typically you want your routers to have well-known
addresses.

In article <42276b38$0$30178$ba620***@news.skynet.be>, "Belga"
be***@nomail.net says...
Show quoteHide quoteIt shouldn't make much difference.  What will cause problems is if
both routers try to use the same network address on the LAN side,
e.g. the Zyxel sets its address to 192.168.0.1 and gives the USR a
WAN address of 192.168.0.2 when the USR wants to give itself
192.168.0.1 on its LAN side too.  So you should make sure that
they're using different network addresses, e.g. 10.0.0.0 vs
192.168.0.0, or 192.168.0.0. vs 192.168.1.0

Rob Morley <nospam@ntlworld.com> wrote:
What Rob said.  Make sure that their LAN DHCP servers are handing out
addresses from different subnets, or they'll get confused.

Exactly.

Don't know the routers but if the usr8054 is a NAT, it should be able to
obtain a DHCP address from the zyxel.  Of course trying to use IP addresses
will be interesting ;-).

Paul DS.

Show quote Hide quote I recently set up a similar scenario with a BT Speed touch and a Belkin
Wireless cable router. I set the second router to get it's ip from the first
by DHCP and it worked fine. I don't know the USR router but it'll need to
have an Ethernet WAN interface.

The addressing could look something like:
Public IP
¦
WAN
Router1
LAN (192.168.0.0/24 -DHCP Server enabled)
¦
¦
WAN (192.168.0.10 - DHCP Client)
Router2
LAN (10.0.0.0/8 DHCP Server enabled)----Client (10.0.0.2)
¦
¦
Client (10.0.0.1)

Just make sure that the two subnets have different addresses.

Grant

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