Cisco 800 series router - anything I can do with it?

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ISP/WAN > Modem > Router (linksys) >Router(CISCO 851W) > (serial cable) 2008 R2

I have the loopback cable connected from my server to the CISCO router. The router is connected to the router in the office with a crossover cable. It is connected to Lan port 4 (Linksys) and the cable is plugged in to the WAN port(CISCO).

I have one adsl modem/router which is not "top" of the line and it lack allot of options which I need. I was able to acquire one Cisco router recently which has all options that I need ( like DMZ, VPN, port forwarding, etc). I'm interested, if I connect the old modem/router to new Cisco router using bridge mode, will I be able to use all the features on the Cisco?

I want to open a port on a Cisco router (1800 series for example). When anyone send data to this port, just forward it to a.b.c.d port xxxx, and send the response back.

Any way to set this in Cisco Router? Thanks.

I get this message on a new 2901 Cisco router:

Cisco Configuration Professional (Cisco CP) is installed on this device and it provides the default username "cisco" for one-time use. If you have already used the username "cisco" to login to the router and your IOS image supports the "one-time" user option, then this username has already expired.

I'm building a lab network with some old Cisco gear so that I can properly test the deployment of a Read-Only Domain Controller in a vacuum (no connectivity to our production network).

Hello, as a learning project I am building a Fedora Linux PC router which will integrate with two other Cisco 1841 routers. I want to interconnect them via the serial interfaces of the Cisco routers . Cisco routers use WIC-1T or WIC-2T serial ports. Has anyone done this before ? If so, what sort of PCI card will I need to install in my Linux router box to enable this ?

We are attempting to test a One To One NAT configuration on a Cisco RV180 router, Cisco SMB support says that this setup below would not work.

We have a Cisco 1841 in our storage IDF that was originally running a 12.4(1) IP-BASE image; I wanted to upgrade to an advancedservicesk9-mz image, but the flash did not have enough space, so I deleted the running image.

Cisco announced an updated line of Linksys wireless 802/11/b/g/n routers for the home market, including a Linux model. The E2100L Advanced Wireless-N Router with Linux OS offers four 10/100 Ethernet ports, a USB port, a UPnP AV Media Server, and like the other E-Series WiFi routers, provides new, more customizable Cisco Connect software....