1841 router in rommon mode cannot install flash

SOURCE: cisco router 1841 connected to serial interface

Hello,
Theres no need to setup for the nat but please check the wan interface and subnet mask ip it has to something else and not 255.255.255.252..Try 255.255.255.240 it must work...

SOURCE: Problem in IOS loading in 1841 router

Hi managobinda,

Try booting from a usb flash:

http://www.cisco.com/en/US/docs/routers/access/1800/1841/software/configuration/guide/b_rommon_ps5853_TSD_Products_Configuration_Guide_Chapter.html#wp1064046


** make sure that the image that you are loading is not corrupted

If still no good, try xmodem:

http://www.cisco.com/en/US/docs/routers/access/1800/1841/software/configuration/guide/b_rommon_ps5853_TSD_Products_Configuration_Guide_Chapter.html#wp1044991



Hope this helps.

Regards,

ex_ocsic-cat

David Grassel

• 75 Answers
• Posted on Jun 05, 2009

SOURCE: Router not responding to http request

possible firewall on the router check settings make sure its not blocking ping requests everything else works?

SOURCE: change IP address of Cisco 1841

once in enable mode, goto config mode. then select interface, i.e. f0/0 and then type in the following:
ip address x.x.x.x y.y.y.y where x is your IP address you wish to have and y is the subnet mask
example below:

router#config t
router(config)#int f0/0
router(config-if)ip address 10.0.0.1 255.255.255.0

hope this helps!

SOURCE: I have cisco 1841 router stuck at Rommon> only

what shows the following?

dir flash: If IOS is ok the follow the below step The router will guide you through changing the registry. You want to press y to chang the configuration. The only other change you need to make is the change to the console baud rate, set that to 7 (115200).

do you wish to change the configuration? y/n [n]: y
enable "diagnostic mode"? y/n [n]:
enable "use net in IP bcast address"? y/n [n]:
enable "load rom after netboot fails"? y/n [n]:
enable "use all zero broadcast"? y/n [n]:
disable "break/abort has effect"? y/n [n]:
enable "ignore system config info"? y/n [n]:
change console baud rate? y/n [n]: y
enter rate: 0 = 9600, 1 = 4800, 2 = 1200, 3 = 2400
4 = 19200, 5 = 38400, 6 = 57600, 7 = 115200 [0]: 7
change the boot characteristics? y/n [n]:

Configuration Summary
enabled are:
break/abort has effect
console baud: 115200
boot: the ROM Monitor

do you wish to change the configuration? y/n [n]:
You must reset or power cycle for new config to take effect.

rommon 2>

3. When you reset the router in your console window you will see characters that you cannot read. You have to stop the session and set your baud rate to 115200. This will let you increase the speed that you use to transfer the file.
4. At the rommon prompt enter xmodem -c {filename}
5. When prompted, enter y to continue
6. From your hyperterminal prompt, click on transfter then send file
7. Select the IOS image then change the protocol to xmodem via the dropdown box then click send.
8. After the IOS has been downloaded, change the boot order by using the confreg 0x2102 command.