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DHCP Relay through IPsec tunnel

DigitalLuminary
Hello everyone,

I've been beating my head on this one for a while now and I can't seem to figure it out. I am trying to relay DHCP requests from a remote network to a DHCP server (Windows 2008 SBS PDC) on the local LAN. So far I can use local LAN DNS names from the remote network and can log into the local router from the remote LAN, however, I cannot PING any machine from the Local network to the Remote network just the gateway/router (192.168.1.1). My configuration thus far:

Local LAN (Sophos UTM9 FullGuard)
Local Network: 192.168.0.0/24
DHCP Server: 192.168.0.2 (Windows PDC)
UTM DHCP Relay: Internal(Interface) -> 192.168.0.2

Remote LAN (Sophos UTM9 Home Edition)
Local Network: 192.168.1.0/24
UTM DHCP Relay: Internal(Interface) -> 192.168.0.2 (Will NOT let me add the External(WAN) interface)

What I am I missing here? My intuition says a Full NAT rule, but i'd have no idea how to set one up.


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  • 0
    @BAlfson, given that both ends are protected by UTM9 I'm not much worried about external threats, and if someone can breach the internal side of the remote network, DHCP or not isn't going to make a whole lot of difference...
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  • 0
    @BAlfson, given that both ends are protected by UTM9 I'm not much worried about external threats, and if someone can breach the internal side of the remote network, DHCP or not isn't going to make a whole lot of difference...
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