Password recovery – Cisco 1841 Router

Password recovery on Cisco Router – config register This is just a quick post for my reference on how to do password recovery on a Cisco Router. Recently I had to do it on a Cisco 1841. Here are my steps: Boot up the router with a console cable and then from terminal emulation software… Continue Reading Password recovery – Cisco 1841 Router

Cisco IOS ACL logging with Port numbers

Cisco IOS logging with source and destination ports Recently I had to do some troubleshooting on a Cisco 2911 Router in order to find out if traffic is going from a certain IP address to another. So I did the usual created an extended Access List and then applied it to the interface like this:… Continue Reading Cisco IOS ACL logging with Port numbers

Common Cisco WLC commands

Graphical interfaces are cool and some people prefer them period. I however believe that everything has its use and personally I love to utilize command line anytime I can when it comes to troubleshooting, configuring or looking at information. Yes there are times when I do like to use a GUI but especially when it… Continue Reading Common Cisco WLC commands

Cisco 1142 not joining Cisco 2504 WLC

%PKI-3-CERTIFICATE_INVALID_NOT_YET_VALID Recently I was setting up my lab environment with a Cisco 1142 Access Point and a Cisco 2504 Wireless LAN Controller and I ran into a minor issue. Cisco 1142 Access Point was not joining the WLC. I was getting the following error message when I consoled into the access point. *Jan 1 04:35:10.126:… Continue Reading Cisco 1142 not joining Cisco 2504 WLC

Testing dial tone and Outbound calling from Cisco Router and FXO Card

I had a need to test and determine if there was a dial tone on the Cisco FXO Card installed into a Cisco 2911 router. I knew that telco terminated the pots lines on the 66 block but I did not know if they were plugged into the Cisco FXO card. I did not have any one onsite to give me a visual confirmation.… Continue Reading Testing dial tone and Outbound calling from Cisco Router and FXO Card

EEM Script for clearing – Cisco IOS

EEM Script example to clear stuff in Cisco IOS I had to recently clear the DHCP Conflict log from a Cisco Router as it was filling up and not allowing devices to get back on the network in a specific situation. Well instead of doing it manually I just decided to give Cisco EEM Script… Continue Reading EEM Script for clearing – Cisco IOS

EEM Script to shut and no shut BGP Neighbor – Cisco IOS

I am loving EEM Scripting so far. Had a need recently to accomplish the following with a script: EEM Script 1 – Shutdown BGP Neighbor Shut down BGP Neighbor Add a static Route Shutdown Multilink Interface Save Config EEM Script 2 – Re Enable BGP Neighbor Un shut BGP Neighbor Remove static route Re enable… Continue Reading EEM Script to shut and no shut BGP Neighbor – Cisco IOS

IP NAT Outside

IP NAT Outside NAT – Network Address Translation, at times can be a complicated process depending on what you are trying to do and how it gets configured on a Cisco Router vs Cisco ASA’s is a bit different as well. This post is about recent NAT – Network Address Translation on a Cisco Router… Continue Reading IP NAT Outside

DHCP Option 43 for Cisco Access Points

Configuring DHCP Options for Cisco Access Points This is a quick reference on configuring DHCP Option 43 in Cisco IOS so that Cisco access points are able to find/join the controller residing in a different VLAN. I will use 192.168.10.0/24 network as an example where all the Cisco light weight access points will reside. Controller… Continue Reading DHCP Option 43 for Cisco Access Points

Cisco Voice Gateway not Re Registering with Cisco Call Manager

One of the Cisco router with a PRI lost its registration with the Cisco Call Manager – CUCM. None of the phones were working for outbound dialing however local extension dialing was working. When I logged into the Cisco Router and issued the following command: show ccm. I noticed that it is going back and forth trying to register with the Primary and… Continue Reading Cisco Voice Gateway not Re Registering with Cisco Call Manager

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