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SMC Barricade 7004AWBR and DSL Router
patsyno1 Apr-30-02 04:18 AM
I Have recently had to buy a DSL Router (as I was finding it difficult in sourcing an Ethernet DSL Modem in the UK!), It is connected to the SMC Barricade 7004AWBR. The network is running fine, but I need help in understanding DHCP and NAT.

SMC unit has DHCP and NAT, so I Disabled DHCP and NAT in the Ethernet Modem. Now SMC WAN connection can't assign an IP address to the Router.

What set-up do I need to establish.

Should the DSL router have NAT enabled and/or DHCP enabled ?


SHould I leave NAT and DHCP to the SMC unit ?

Thanks in advance for the help


1. RE: SMC Barricade 7004AWBR and DSL Router
lbyard Apr-30-02 12:19 PM
In response to message 0
What is the make and model of the MODEM? Does it have a built-in router? Larry

2. RE: SMC Barricade 7004AWBR and DSL Router
patsyno1 May-02-02 02:59 AM
In response to message 1
The make is a home grown offering from DSL-warehouse.co.uk called 906e

Yes it has an in built router.

3. RE: SMC Barricade 7004AWBR and DSL Router
lbyard May-02-02 10:42 AM
In response to message 2
The MODEM should be assigning and IP to the router. There is no need for it to be a translated IP. So, I am suggesting disable the MODEM NAT and enable the DHCP server. I donít know if that will work as I do not have one. Usually, the DHCP function for the WAN port on the router is performed by the service providerís DHCP server, but a local IP might first be assigned by the MODEM to allow connection to that server. I have successfully cascaded NATs (routers). A router NAT isolates the Wan port from the local ports. The WAN port talks to the Internet and has an Internet IP; PCs local private IPs (http://duxcw.com/faq/network/privip.htm ) and talk to local ports. Larry

4. RE: SMC Barricade 7004AWBR and DSL Router
pc guy May-02-02 11:43 AM
In response to message 1
(After I finished writing this, I saw Larry's reponse but I wanted to send it along anyway.)

I just purchased the SMC AWBR but use on my company LAN. The SMC won't assign DHCP addresses on the WAN side, only on the LAN. You'll need to use static IP addresses in order to have the routers connect.

Here's how the IP address assignment should look like per interface.

(Internet cloud or WAN)
DSL router WAN- static or DHCP assigned IP address from your ISP
DSL router LAN- Static address you assign (ex:
SMC AWBR WAN- Static address you assign (ex:
SMC AWBR LAN- Default static address (DHCP enabled here)
Clients on LAN- Receive DCHP addresses from the the range of through 40)

You may not be able to disable NAT and probably shouldn't have to.

I hope that helps some.

5. RE: SMC Barricade 7004AWBR and DSL Router
hedrat May-06-02 04:23 AM
In response to message 4
I'd really like to thank PC Guy for his comment above, it works exactly as it says (and ended a frustrating week of failed configuring). I used an SMC7004BR with an AMX-CA61E adsl router. One tip I'd like to add to his suggestion, is if you're adding a new adsl router to a Barricade you've already spent time configuring, and you want the changeover to be as painless as possible - look for a DMZ host option on your ADSL router. This opens all ports to the IP address for your Barricade (or other) broadband router so you're existing firewall conditions still apply for your local network without having to duplicate them within the ADSL router.

Your mileage with this suggestion may differ, but it works great for me and means I don't have to worry about any other features for the ADSL router - obviously your security still needs to be double-checked either way.

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