Configuring a Cisco DPC3825


I ordered an internet connection from Rogers for a new branch office in Toronto. Normally this is against my morals, but in this case there was simply no alternative in the price/service range. The service ordered was a fast cable connection; Rogers supplied a DOCSIS 3 router, the Cisco DPC3825. This is a fairly capable little router, but has a few quirks.

For anyone who’s using one of these, the first thing you need to know is the default admin credentials. These weren’t provided to me anywhere, and it took me a while on Google find them.

Default username: cusadmin
Default password: password

Once in, the interface is pretty straightforward, though there are some quirks in the field validation. If you want to change the IP address of the router to a different IP range (including changing the DHCP range), then you need to first disable DHCP, save the config, and then reload the page. If you don’t do this, then you’ll get an error about the DHCP range not matching the subnet. Once that’s done, you can change the IP subnet the unit uses to something far more appropriate than 192.168.0.1.