Does the Surf SOHO have a bridge mode? I want to use the Surf for the internet connection because of it’s multi WAN capabilities, and a different device on my network to handle DHCP.
Drop-in mode is supported on Balance 210 and above. Please find here for more details.
You can disable DHCP in the Surf SOHO with Network -> Network Settings -> checkbox for DHCP server. But, this may not be necessary. I would guess that if you set the other device to give out IPs in a different subnet from the one the Surf SOHO is using you should be OK.