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Curious VPN behaviour on RV042 - No access to local network

Discussion in 'Cisco Small Business Routers and VPN Solutions' started by mmcalis1, Nov 23, 2005.

  1. mmcalis1

    mmcalis1 Network Guru Member

    Perhaps I am being a wally and a total newbie but I am having a bit of a problem with 2 VPN tunnels running on the RV042.

    Basically I have two home workers using the WAG54G which VPN in to a RV042.

    One WAG54G has a local network which is 192.168.1.1-10 and the second WAG54G has a local network which is 172.17.0.23-25

    The local network behind the RV042 is 172.16.0.1-254

    All three have a netmask of 255.255.255.xxx

    Now if I set up the following VPN's (From the RV042 point of view)

    VPNHOME1
    Local = 172.16.0.107
    Remote = 172.17.0.23-25

    VPNHOME2
    Local = 172.16.0.114
    Remote = 192.168.1.1-10

    All is well and works perfectly - from the remote homes you can access 172.16.0.107 and 172.16.0.114 respectively.

    BUT.

    If I modify the VPNHOME1 to this
    Local = 172.16.0.1-254 (All IP's behind RV042 not just 1)
    Remote = 172.17.0.23-25

    I can not access any of the IP's in the range 172.16.0.1-254 from 172.17.0.23-25. (Not even the original 172.16.0.107)

    If I then disable the other vpn VPNHOME2 I can access any IP in the range 172.16.0.1-254 from 172.17.0.23-25. It works!

    If I then re-enable the VPNHOME2 vpn VPNHOME1 stops working again!

    When I say it stops working is not exactly true - the WAG54G and RV042 VPN's are still connected and can be disconnected and reconnected with no problem - its just that I can't access any of the 172.16.0.0 network from my home PC 172.17.0.24 whenthe VPNHOME2 tunnel is connected.

    I am thinking this is a routing issue - ie. I ping 172.16.0.1 from my home (172.17.0.24) it goes to 172.16.0.1 but then the return packet comes back to the RV042 and it does not know which VPN tunnel to send it down - is this silly?

    So my question is - is this a fault? or is this a problem with overlaping Local IP's for the VPN tunnel?

    Then my next question is how do I setup a VPN to access all RV042 local IP's and then one that just accesses 1 of them!

    I am stumped!

    M :cry:
     

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