you can change the modem login password  from your end by following the steps mentioned on the below article.

https://arris.secure.force.com/consumers/articles/General_FAQs/SB8200-Changing-the-Admin-Login

thanks for the info. worked great.

I’ve been trying to do this and the IP address doesn’t work for me.  I haven’t been typing the protocol first as nowadays that usually defaults to what it needs to be.  If I ever get technical support to call me back about configuring my second ethernet port I am asking them about this also.  It doesn’t matter which of the ethernet ports I use either.