Signed up for Sonic Fusion, received ZTE 831 modem in bridge mode, DHCP off.
Have tried many variations of D-Link settings with WAN DHCP and it just does not get an IP address from the ISP. Unicast on/off, DNS relay on/off, SPI on/off, etc.
With the modem settings unchanged, can plug cable from PC directly into modem. It gets an ISP DHCP and works fine. DNS and internet access work, can surf google.com.
Have an Airlink AR525W wireless router. When it is set to DHCP WAN, it also "just works" when plugged into the DSL modem. It is using the router MAC, did NOT clone the MAC from my PC. The Airlink LAN IP is 192.168.1.1, same as the D-Link. The copy-paste from the Airlink configuration screen:
Connection Type: Automatic Configuration - DHCP
Internet IP Address: 220.127.116.11
Subnet Mask: 255.255.255.0
Default Gateway: 18.104.22.168
DNS 1: 22.214.171.124
DNS 2: 126.96.36.199
DNS 3: 0.0.0.0
The D-Link was working fine with ATT DSL and PPPoE (this is in SF Bay Area, 94022), but extremely frustrating that it does not seem work to with Sonic DHCP. Called Sonic support, and was able to confirm that plugging the PC directly into the modem works fine. So it seems there is a problem with the DIR-825 (or configuration of it).
Any guidance would be much appreciated.