Dell 2330dn Network Printer Not Responding

We recently got a second-hand Dell 2330dn Laser Printer from the business we share an office with. We used to print to it via this business' network, which worked fine. Now we want to use it on our own LAN, and have plugged it via ethernet into our router, but it won't print.

We have three iMacs; mine is a mid 2011 model. None can print to the Dell printer –– when we try it tries to find the printer and then says 'Printer not responding'.

I've tried everything I can think to fix it, including:

• Resetting the modem

• Restarting my computer

• Resetting the printer, including to factory settings

• Resetting printing system in system preferences and re-adding printer

Nothing seems to work. Printer works if I plug it directly into my machine. I printed out its network statistics, and I have its IP address. When I ping it, though, I get the error:

36 bytes from lo0.lns20.mel8.on.ii.net (150.101.32.54): Communication prohibited by filter

Vr HL TOS Len ID Flg off TTL Pro cks Src Dst

4 5 00 5400 4ccf 0 0000 3e 01 ad0d 192.168.1.1 192.168.0.123

I searched the forums and tried Bonjour Browser, but it doesn't show up in that. I also tried WakeonLan –– the printer shows up there, but without a Mac address, and when I wake it up nothing happens.

Pretty much out of ideas. An