Login ID/password for Arris TG1682 in Bridge Mode?

Can the TG1682 be logged into when in bridge mode and if so, what are the credentials?  I discovered by accident the login IP changed for the TG1682 when in bridge mode.  I can get a login prompt at 192.168.100.1 but the default login credentials no longer work and nor does the previous credentials when TG1682 was providing firewall duties.  FWIW, an Netgate SG-2220 is firewalling now.