ADSL Modem-specific notes
The Asus 6000 is an ADSL modem/router. This means you can plug in into your LAN and it takes care of doing NAT, etc. With the later firmware versions you can also use it as a forwarding nameserver. It supports pinholing and has "special" NAT support for some protocols that don't play nice.
You can configure the modem by telnetting to it. It also runs a webserver on port 80.
Its default IP address is 192.168.1.1.
The default password for the modem is "adsl1234" or maybe "asus" depending on the firmware version.
One page links to ASUS6000: