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I had been running a Huawei HG612 connected to a DD-WRT router for internet services using PPPoE as authentication.

Due to an office move, I need to have a DG834 modem+router which will be used for connecting to a PPPoA network. After that, the router running DD-WRT will take over for the NATing and firewall rules.

There is 1 dynamic IP and 5 static IPs available to us. Is there a configuration I can implement where the modem takes the dynamic IP and the DD-WRT router is passed traffic for the 5 static IPs? I've been looking at static routes but I'm a bit out of my depth!

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Looking at the manal for the dg834gt, you should be able to do this as follows -

  1. Set up the router "as normal" so that the ADSL (PPPoA) connection works.
  2. Set the LAN range as 192.168.0.x - make sure both your DG834 and DD-WRT router are in the same range AND HAVE STATIC IP ADDRESSES ASSIGNED.
  3. Set up a static route with your subnet with the gateway being the 192.18.x.x address of the DD-WRT router. You can do this in advanced -> Static Routes. (See page 102 of this manual).

Depending on your model (according to this link), you might also be able to use "Half Bridge" mode, which pushes the external IP address to the DD-WRT using DHCP. (Although I don't have the luxury of a subnet routed to my ADSL connection, I also have a PPPoA connection and use a cheap dynalink modem to do half bridging to my Linux box - this is probably a better solution) as it makes your ADSL router seemless to the wider Internet and is probably simpler to configure.

  • Thanks for your help! This works inbound, but doesn't appear to work outbound as I now have 2 NATs operating on the network. Is there a way I can safely disable the NAT on the DG834? – MrNorm May 13 '14 at 9:43
  • Have a look at support.zen.co.uk/kb/KnowledgebaseArticle.aspx?articleid=10048 - Specifically there appears to be a setting to disable NAT. As you have valid IP's you should be able to disable this OK. REMEMBER THAT IF YOU DONT HAVE NAT YOU NEED TO SET UP FIREWALLING - POSSIBLY ON EACH DEVICE, OR THEY WILL BE DIRECTLY ACCESSIBLE AND MORE VULNERABLE TO HACKING. – davidgo May 13 '14 at 21:18

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