Rv042 VPN behind NAT, which ports to open?

Discussion in 'Cisco Small Business Routers and VPN Solutions' started by sevr08, Apr 17, 2008.

  1. sevr08

    sevr08 Addicted to LI Member

    What ports need to be open to the RV042 for clients to be able to connect to it? (or can it be done at all, running RV042 as VPN server behind NAT)

    I cannot put the RV042 first because my Internet connection is shared with a couple of other companies, and I do not have access to the main router... All I can do is send an email to the router administrator and ask him to open ports to the IP assigned to my Rv042 (which is running NAT and a private subnet behind).

    Is it possible to run VPN server on nonstandard ports ? If so, how ?

  2. Sfor

    Sfor Network Guru Member

    In case of an IPSec VPN, just the port redirection will not do, I'm afraid. The NAT router you are connected through has to be IPSec pass through capable. Then, after redirecting ports 500 and 4500 it should be possible to make an IPSec connection.
  3. sevr08

    sevr08 Addicted to LI Member

    OK thanx, that's because of the protocol 50 and 51 ?

    But you write "in case of Ipsec VPN" .. Is there any other possibility with the RV042 ?
  4. Sfor

    Sfor Network Guru Member

    I do not know details of the IPSec protocol. I've tried to connect a WRV200 behind a NAT router with a remote RV042. To persuade the WRV200 to act as a IPSec server I had to replace the NAT router with an IPSec pass through capable one. Without the pass through function and with just the port redirection, the VPN was not working.

    There is a PPTP server built in the RV042. But, I do not know much about this kind of VPN.
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