So, here's my problem.

I have a small network of 6 computers using a sonicwall router (which has 4 LAN ports and also acts as a WLAN access point.)

The IP address of the router's LAN interface is 192.168.0.2 while it's WLAN interface's IP address is 172.16.31.1. Both interfaces have DHCP enabled with LAN serving 2 desktops (assigning IPs as 192.168.0.xx) and WLAN serving 4 laptops (assigning IPs as 172.16.31.xx).

Now, I have connected a printer to one of the desktops and I can print to it fine from both desktops (both wired). However, I cannot print from the laptops at all. I tried pinging and discovered that the 192.168.x.x machnies cannot ping the 172.16.x.x machines and vice-versa while those in the same address range can be pinged and can communicate.

How can I change my network settings so that I can print from all the machines (in both the 192.x.x.x and 172.x.x.x address ranges). Please help!

You need to change the ip address of the wireless network to
192.168.0.xxx.

You need to change the ip address of the wireless network to
192.168.0.xxx.

I tried to do that but it doesn't work as the device gives an error saying that another interface already exists on the subnet and it does not allow that.