troubleshooting Question

RV325 Dual Wan Router with SBS2011

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intsupFlag for United States of America asked on
RoutersBroadbandNetworking
6 Comments1 Solution395 ViewsLast Modified:
thanks in advance for the help!

Here is the equipment I have and your help configuring the RV325 is appreciated:

1. Cisco RV325 dual wan router  (in the box so I haven't configured anything - ports, etc yet)
2. DLink DSL-520B dsl modem (ip address 192.168.0.1 configured to allow all allowed ports, including mail, to the sbserver 192.168.0.2)
3. Motorola Surfboard SBG6580 cable modem ((ip address 192.168.0.1 configured to allow all allowed ports, including mail, to the sbserver 192.168.0.2)
4.  Small Business Server 2011 server (ip address 192.168.0.2, handles exchange ingoing and outgoing mail)

brief background:  the cable and dsl modems have the same ip address because we used to simply swap them out whenever either would lose connection and direct the SBS 2011 machine to use 192.168.0.1 as the gateway.  cable modem was the primary because it's faster.  and then allow the dnsupdater on the SBS2011 machine to update our ip address to receive email on the correct modem.  about 6 months ago the cable modem had a glitch and now some phantom DHCP service is switched on which plays havoc with the SBS 2011 DHCP server.  have tried to turn it off but all settings on the cable modem for DHCP services are OFF.  

so now that we want to simplify our life without having to swap (not that we have been able to because of the cable modem DHCS server issue), we bought the RV325 to handle the internet connection automatically.

Several questions someone can answer, unless someone has already done this and has a configuration that already works...

1.     Is it ok to leave the ip addresses the same on the cable and dsl modems?  common sense says no but want to check.  
2.     if NOT ok and each modem needs a unique ip address, then do we allow DHCP service to run on them
3.     will the RV325 block any incoming dhcp servers or does it simply work as a switch if the DHCP server on the RV325 is turned off?
4.     on the RV325 do I turn DHCP service OFF or use the RELAY?
6.     on the RV325 do I assign an IP address?  if so, what ip address?
7.     do I turn off DYNUPDATER on the SBS2011 machine and use the dns updater in the RV325?

knowing the above will get me started and thanks for the help!
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