Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
I don't know what you mean by 'ping the printer from inside'... but ping access is often limited by network security.
Still... in any case of connecting a device (e.g. a printer) to a network, you need to consider these things:
1. it must have a means of connecting - either wired, or wireless. Check indicator lights, to see if the cards are talkign to each other at a basic level, if it is connected by a cable.
2. it must have an IP address
. If you do not set a static IP addres for it beforehand, it should get one by DHCP
3. the SubNet Mask should match the IP address, more or less.
4. and you should check on all these, by accessing the printer's IP Address or Network Configuration settings.
From what you state, the BizHub has an IP address, within the subnet of the Router, and the SubNet Mask is also correct for both.
What other symptoms are there of not being able to connect the printer? is the computer failing to send print jobs to it? if so, check the firewall (or, network security, or internet security) software on the computer. It may well be blocking the access of the computer to the printer over the network... adding a rule to the firewall, allowing communication with 192.168.1.20, might help with this.