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Help with VPN and DHCP

Discussion in 'Cisco Small Business Routers and VPN Solutions' started by ChristianF, Dec 3, 2008.

  1. ChristianF

    ChristianF Addicted to LI Member

    Hello everyone :)

    I'm having quite trouble with a VPN setup.
    There is 1 W2K3 Server on the Network 192.168.1.0, working fine, assigning IPs by DHCP, running Active Directory with DNS and so on... everything works fine. Also in the net, there is an RV042.

    Another RV042 is attached to the net by a VPN tunnel (other net: 192.168.2.0). On this side of the net, there are ~ 20 Clients that also should use the AD structure on the other side (Exchange, shares etc). So now, the problems are starting:

    I set up DHCP in the RV042 on the .2.0 subnet and entered the DNS Server of the .1.0 subnet in the DHCP settings in the rv042 (so it assigns e.g. 192.168.2.10 as an IP for a client on the non-server-site, with the DHCP lease the client gets 192.168.1.100 (DNS Server on the other side) as an DNS server. Everything's nice while using IP access, but when it comes to DNS access (like "http://server.lan.local" that is 192.168.1.100), it doesn't work. Additionally, it also doesn't work to access a share when entering \\server\share or \\server.lan.local in windows explorer from the .2.0 site. On the .1.0 site, everything works fine (the DHCP server here is set up in the Windows Server and assigns valid .1.0 addresses and assigns the server as the DNS server (.1.100). Here, everything is fine, but on the .2.0 side, it doesn't work.

    I wouldn't mind setting up fixed IPs on the .2.0 site, but as it is a satellite office where the roadwarriors come in to get their news and files and soon leave again, the devices often change.

    Does anybody have an idea?

    My thoughts went towards setting up different scopes in the DHCP on the .1.0 site, but how to tell the RV042 on the .2.0 site to forward the requests, and how to tell the DHCP which scope to use by assigning .2.0 addresses to the remote net and .1.0 addresses to the local net?

    Thank you very much!

    Kind regards and sorry for my bad english,
    Christian


    PS: All clients use at least XP Pro, some use Vista Business.
     
  2. Sfor

    Sfor Network Guru Member

    It is not possible to forward DHCP requests through a VPN tunnel, as far as I know.
     

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