not near a RVL currently but you should be able to create a firewall rule to allow DHCP accross the tunnel. i do not beleive the RVL has a DHCP realy option, but you should be able to get around that via the firewall rule... OH, no the DHCP server built into the small business routers are just simple and no options can be defined for a scope.
I see what you mean but we are not using the DHCP protocol in any way so I dont think it would be accurate to say it is similar to DHCP relay or IP helper. Because we are allowing the broadcast packet and will be sent as such not as an unicast as with relay. All we are going to do is define what interesting traffic is allowed to pass and what is not.
Single DHCP server with Multiple scopes:
local scope: 172.16.20.0 ==> .20 - .100 (80 addresses)
remote scope: 172.18.20.0 ==> same as above (just for clarification, the GW defined in this scope would be the LAN IP of the remote gateway router)
allow port 67 and 68 UDP from to 172.18.20.0 subnet
allow port 53 UDP from to 172.18.20.0 subnet
for TFTP you should not have to create a rule as the client would technically be on the LAN at that point.
and then the reverse for the remote site. if you cant set this please post a screenshot of the access rule web page for the router.
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