Sonicwall VPN and DHCP Setup


We have a customer with a Sonicwall TZ300 which they want to setup VPN client access for remote users etc...

I have got the VPN to work when I click on the 'Use internal DHCP server' and the 'for Global VPN clients' options within the VPN/DHCP Over VPN section of the unit...

The issue is the customer has an existing 2012 R2 server within the network serving as a DHCP(since they want to use the Windows server version of DHCP etc...)

Is it possible to make these 2 work together? Or how do I setup the DHCP on the Sonicwall to pass through to the internal DHCP? I tried using the 'Send DHCP requests to the server listed below' option but this doesn't seem to work.

Need some help if someone has done this or has a similar setup to the above

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Rob WilliamsCommented:
Is there a "use DHCP relay" option on the SonicWALL?
In the "DHCP over VPN" menu select "Central Gateway" select the "Configure" button next to it, and in the pop-up dialog tick "Send DHCP requests to server addresses listed below" and populate the list with the IP of your windows DHCP server(s).

Screenshot is from an earlier version of SonicOS so apologies if it's a little bit different on the newer versions, but I'm sure the same setting will be there!

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Rob WilliamsCommented:
Odd that doesn't work.
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Works here, for years! Might need to take it up with Sonicwall then...
Aaron TomoskyDirector of Solutions ConsultingCommented:
Did you add the vpn scope to the windows server?
Rob WilliamsCommented:
Should use the existing scope by default.
smckeown777Author Commented:
Hi ccomley

That did the trick - the issue was I had the 'Use internal DHCP' ticked as well which probably wasn't I can see it connecting and getting IP from the internal DHCP - many thanks!

Rob - the relay I tried yes but also couldn't get that working...might have been swapping too many things at once which wasn't helping

Aaron - I assumed the internal scope would be fine and obviously its working - but using a different scope would be nice for sure cause I could tell VPN connections from internal connections - how do I do that on the 2012 server though? Or asked a different way how does the vpn client know to use that alternate scope?

Sorry if I need to ask this as a separate question I'll do that
Aaron TomoskyDirector of Solutions ConsultingCommented:
smckeown777Author Commented:
Hi Aaron

Ok thanks for that link, I'll review and see what i can do
smckeown777Author Commented:
Thanks for the help lads...
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