RV082 with PPPoA + NAT - Please help!

Discussion in 'Cisco Small Business Routers and VPN Solutions' started by lordbyte, May 25, 2005.

  1. lordbyte

    lordbyte Network Guru Member

    I have an RV082 with two WAN connections. WAN1 is connected to an ADSL modem using PPPoE (modem is using Bridged Ethernet), while WAN2 is connected to an ADSL modem using PPPoA (with NAT) since this ISP does not support PPPoE.

    WAN2 on the RV082 is set as 'Static IP' with WAN IP2:, Gateway: (ADSL modem) and DNS:

    My problem is that since the modem is using NAT, I have to forward incoming ports, which are normally (for WAN1) forwared by the RV082 to the rest of my LAN.

    I tried setting up forwarding so that the modem looks like this:
    Forward TCP 25 to (the WAN2 IP on the RV082) and then port 25 is forwarded by the RV082 to

    This setup works for WAN1 (port 25 gets routed to but for WAN2, nothing happens!

    Any ideas?

    The WAN2 modem is a Speedtouch 530.

  2. mr-linksys

    mr-linksys Network Guru Member

    I just bought 2 RV082 myself for the purpose of an ADSL VPN tunnel between 2 offices. On one site I have an ISP which is using static IP's, no problem to setup my RV082 on this site.

    On the other site I work with a provider which is using PPPoA (Dutch KPN mxstream). According to the Linksys helpdesk I had to setup my RV082 WAN as PPTP with username & password. I've been working on it for about 5 days trying to set it up with the help of Linksys, but didn't get it to work. First they thought it was my ADSL modem (speedtouch 580), which is configured as bridged for this purpose. They told me to get an other modem, but when I asked wich modem would work, they couldn't give me an answer. I asumed the RV082 was tested with their ADSL modems. So I asked which Linksys ADSL modem would work with the RV082, they couldn't tell me either. They even made a test in their labs, at the end they found out that the RV082 is not working with PPTP. They will fix it in their next firmware.

    So for all you out there trying to connect the RV082 with an ISP using PPPoA, and trying to setup your RV082 WAN as PPTP... IT WON'T WORK! If it does please let me know!


  3. TazUk

    TazUk Network Guru Member

    Double NATing is never a good idea and can lead to strange results as you've seen :( I can't see the connection between PPPoA and the need for NAT :? PPPoA is used exclusively in the UK and I've setup ADSL Ethernet modems without the need for NAT?
  4. RockyRouter

    RockyRouter Network Guru Member

    Does your WAN2 ADSL modem/router have a DMZ option? If so, try enabling it and setting your RV082 WAN2 port in its DMZ IP address space. That might take care of all the port forwarding issues.
  5. DocLarge

    DocLarge Super Moderator Staff Member Member


    sorry about your original post being hijacked :) ; possible solution is at the following link for issue pertaining to Mr Linksys's dillema (and yours too from the looks of things :) ) :


    Lordbyte, you'll most likely need to replace your speedtouch with an adsl modem that can allow ethernet devices to connect to it (the same as or similar to what you have on WAN1). Putting your RV082 in a DMZ configuration is "not an option" because it would first have to be able to "connect" over a PPPoA connection which is not going to happen, due mainly to the technologies being incompatible.

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