Initial install of a SonicWall TZ200 router between our Windows Server 2003 LAN and the ISP's modem. Both the ISP and SW say that it should be easy, but I'm having a tough time setting up the WAN interface.
DHCP is done by our server (192.168.0.99). I'd like to set the TZ200 at a static IP of 192.168.0.98. The ISP modem has a public IP and is also the LAN's gateway at 192.168.0.1.
I've set the LAN interface at STATIC with the above info... no problem. But then, the WAN interface wants me to set an IP address. I've tried the 192.168.0.98/255.255.255.0, but it says that the "Subnet on this interface overlaps with another interface."
After conversations with the ISP, they're saying that we need to pay for an additional static public IP for the router. Or, that if I changed the modem to be the DHCP server that "should" work.
Big problem is that I have really limited opportunities to mess with this stuff on-site, so calling SonicWall tech support has been frustrating - it's hard to gauge when you'll get an actual tech on the phone - could be 5 minutes or 65 minutes.
Anyone have experience with this type of setup? Are these two options (additional static IP or change DHCP) the only ones I'm left with?
Thanks in advance!