Thanks for your response!
I couldn't open the link you provided; it results in "Unexpected error regardless which browser I use. However I looked up transparent mode, and found several articles that discussed this. So THANK YOU for pointing me in the right direction!
One quick followup question (only if you know). While troubleshooting this I purchased an SRX100 online, to try to replicate at home. That device is running JUNOS 10.x. Since it's EOL, do you know if there's any possibility I can use it in transparent mode? (I think that became available in 12.x). Any way I can purchase the updated image with that device no longer being supported?
Thanks again!