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IP Helper Between 2 LAN's

I have two LAN's and each has it's own DHCP server. The two networks are separated by two firewalls and I have never had a need to place a connection between the two until now. LAN 1 is a Sonicwall TZ670 ( and LAN 2 is a Cisco RV340 ( and I now need to place devices from LAN2 on LAN1. I'm assuming I'll need to implement VLAN's for LAN1 and LAN2 and I'm also assuming that I will need to use IP Helper to setup a DHCP Relay Agent on the Sonicwall. However, is there more to it than that or am I missing something?

Category: Entry Level Firewalls


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    ArkwrightArkwright All-Knowing Sage ✭✭✭✭

    If there is already a DHCP server in each network, then what is the helper going to be doing?

    Your "real" question seems to be, how can I connect the two networks together? I think you need to take a spare interface on each firewall, connect them together, configure a network between them for routing and create a static route on each firewall pointed at the other firewall's IP in the routing network. Create access rules to suit the level of access you desire.

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