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Restoring a Cisco 831 from ROMMON

Restoring a Cisco 831 from ROMMON
This process can be used when a Cisco 831 keeps booting up into ROMMON mode.Here is an example:The router cannot boot up because the image file has become corrupted. Notice the errrors on the lines that are highlighted.The first step to fix this problem is to set up your PC as a TFTP server. Start ...

Cisco Bypass Startup config (Do not use on live routers)

Cisco Bypass Startup config (Do not use on live routers)
If you need to restore a router so you can reuse it again but you do not have the enable secret password, follow these steps to wipe the routers config.1) plug a console cable into the router from your serial port on your computer. Set your terminal program (hyper terminal, SecurCRT, Etc..) to use Com ...

Cisco IP Proxy-ARP Problem

This occurs when the Cisco proxies ARP based on devices connected on its interfaces. In other words, if the Cisco detects an ARP request device on the LAN, it will proxy (act on behalf of) for that device and will forward numerous ARP requests on all its interfaces.This may cause issues with some ISP’s related ...

Cisco DHCP Sites – Changing DHCP Server IP Address

As a reminder to all: There is a known issue with Cisco’s that are installed at site’s that have DHCP ISP service. This is not just particular to EZ Corp, it is with all of our Cisco sites. The symptoms are that when you run sh ip int b, you see that the Dialer 1 ...

Debugging Dial Modem on Cisco 831

Run these commands: Code: debug dialer debug chat debug modem debug ppp negotiation term mon If possible, create an access list to a host and route that host to the dialer interface. Therefore, when you send a ping to that host, it establishes a dial connection. Code: access-list 101 permit icmp any host 4.2.2.2 ip ...

Resolving dial back up problems

If you run into problems with the dial back up these are some useful commands that can help you if the broadband is currently upLogin into the cisco via the broadband and paste in the following scriptconf taccess-list 101 permit icmp any host 200.200.200.1ip route 200.200.200.1 255.255.255.255 dialer1endwr memnow debugterm mondebug ppp negodebug chatdebug dialerOrFor ...

Deleting from Rommon – permission denied

Change the Registry to: rommon 1 > dir flash:Directory of flash:/ 2    -rwx  19530     <date>               device.original.cfg3    -rwx  2079      <date>               sdmconfig-8xx.cfg(removed Extra Entrees for space) 25   -rwx  110905    <date>               crashinfo_20080426-19435026   -rwx  1906      <date>               baseline-20110712.cfg 16259072 bytes available (7223296 bytes used)rommon 2 > delete flash:crashinfo_20020304-020604Are you sure you want to delete “flash:crashinfo_20020304-020604″ (y/n)?yFile “flash:crashinfo_20020304-020604″ not deleted — ...

Re-applying the Crypto key

Normally the Crypto key is applied at the time of configuration to allow SSH into the router. The BCU currently applies this as part of the semi-automated process before running SRP or coping a configuration onto the router. If this is done by a manual process, the person configuring the router needs to manually apply ...

Understanding the ‘Show Interface FastEthernet’ Stats

FastEthernet0/0 is upIndicates whether the interface hardware is currently active and if it has been taken down by an administrator.line protocol is upIndicates whether the software processes that handle the line protocol consider the line usable or if it has been taken down by an administrator.Hardware is AmdFE, address is xxxx.xxxx.xxxxHardware type (for example, MCI ...

Determine Remote Site WAN IP from Headend

There are two options; the easier of the two is the command ‘Show crypto ipsec sa | begin (loopback ip) Sterling_HE1#show crypto ipsec sa | begin 2.2.2.136 remote ident (addr/mask/prot/port): (2.2.2.136/255.255.255.255/47/0) current_peer 216.160.43.25 port 500 PERMIT, flags={} This is a quick and easy way to find the Wan IP the tunnel is built to. This ...

Site last updated February 23, 2015 @ 8:32 pm