DHCP over Sonicwall Tunnel

Hello,

We are looking into setting up a remote site tunnel using a Soncwall NSA 2600 (local) and a Cisco RV110W (remote). We would like to have DHCP from our local network (10.56.102.0 /24) to give addresses through the tunnel, to hosts connected to the Cisco device. So hosts on the remote network, would look as if they have a 10.56.102.0 address. Is this possible?

Thanks!
James SeifertAsked:
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Nathan HawkinsTechnical Lead - Network SecurityCommented:
Why would you do this? If anything happens to the circuit, internet routing goes wonky, edge equipment failure...practically anything... The remote office is pretty hosed... You need to setup a remote server onsite at the remote office that does all of the Day to Day services so that latency and other single point of failure mission critical services are delivered properly and you dont have to troubleshoot anything of that nature WHEN something goes wrong.

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JohnBusiness Consultant (Owner)Commented:
I would not do that (agree with the above).

Both the Sonic Wall and Cisco are capable of split tunneling and both can give out IP addresses. So assuming the Cisco is remote, set it up to hand out DHCP locally to the remote devices. I can do this with my Cisco box.

I am assuming you don't want an actual server at the remote site. Please let us know about that.
JohnBusiness Consultant (Owner)Commented:
I should add that forcing the remote site to go the office for all its traffic (that is what DHCP will do) will be very slow (slower than VPN is anyway).
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JAN PAKULAICT Infranstructure ManagerCommented:
We tried that solution - very quickly went back (and that was on 100Mbps bearer - with latency less then 10ms)
basically when you have vpn tunnel -  packets have to be formatted  to pass the tunnel (and obviously inspected) =which is slow
JAN PAKULAICT Infranstructure ManagerCommented:
solution to your problem would be using variable subnetting

like

10.56.102.0 /25
network 1 from 10.56.102.0
10.56.102.1-10.56.102.126  (127 broadcast)

network 2 from
10.56.102.128 /25
10.56.102.129-10.56.102.254 (255 broadcast)

so your subnet mask on both would be 255.255.255.128
JAN PAKULAICT Infranstructure ManagerCommented:
or use 2 different subnets with dhcp on each location(much easier to manage)
Nathan HawkinsTechnical Lead - Network SecurityCommented:
The question that was asked was whether it was possible and my original response pretty much addressed this question. Dont do it... As for the specifics... Setup an entirely different DHCP scope for the remote office to use. I wouldnt use anything even close. Use the 172.16.0.0 /26 RFC 1918 subnet for Non Local but stil trusted traffic. Logically this is better because now for logging purposes you know exactly who is doing what with regards to access by IP per outside office.
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