Member Avatar for jim3472

I have a CISCO 2800 serise router. I am faching prolem with it. I need to enter the router. But i have forgot the router's IP. Can anybody tell me how i can find the IP?

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Quick summary: there are three reliable ways to discover the Cisco 2800's LAN IP — from a machine on the same network, by scanning the LAN, or by connecting to the router console. is right that checking a connected client is the fastest when you have access to the LAN. If you have physical access, 's console suggestion is the definitive fallback.

From a workstation on the same network, inspect the routing and ARP tables or run a quick traceroute or host discovery scan. Example commands (run where appropriate for your OS and network range):

Linux (modern):      ip route show
Linux (legacy):      route -n
macOS:               route get default
Windows:             route print
View ARP entries:    arp -a
Traceroute first hop:traceroute 8.8.8.8
Quick network scan:  nmap -sn 192.168.1.0/24

If you can open the router console, use a serial adapter to the console port with typical settings 9600 8N1 (no flow control). Once at the prompt, view the interface address summary to see every configured IP on the box:

show ip interface brief

Final tips and cautions: if the client shows a gateway that is not the 2800, you may be behind another device (ISP modem or firewall). Check DHCP server leases or the connected switch MAC table for Cisco OUIs to identify the device. Avoid factory resets unless you have a backup of the running-config — reset will erase settings. If unsure, take a laptop, console cable, and an IP from a likely subnet so you can inspect the router safely.

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Member Avatar for rubberman

If you are running Windows systems, go to the command prompt (cmd.exe) and run the command "ipconfig". If Linux/Unix, go to a command prompt and run the command "ifconfig". These should should your network interfaces, and the address of the router (gateway), along with other stuff.

Member Avatar for XP78USER

or ipconfig/all

Member Avatar for rubberman

- the /all flag should not be necessary to find the gateway address. What it will do is generate a lot of confusing data for a new user. :-)

Member Avatar for CimmerianX

you don't type that into the router... that's a windows command.

IF you have physical access to the 2800, use a Console cable to the unit connected to a terminal emulator (e.g. putty).

enable
<enter your password>
show ip int | incl Internet address

That will list all ips on the router.

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