Ali's Technology Blog
This is something that keeps coming up while studying for different certifications and I always have to review everything, flip through the pages since there are technically 3 sections here, I decided to write up a quick overview of all 3 including the flow as shown in the diagram below. When a Wireless Client connects… Continue Reading CWAP – Machine State/EAP/4-Way Handshake
Recently I configured a Brocade ICX6450 PoE switch on the network and all was working well until my customer hooked up a phone to one of the ports I configured. I was told that the phone won’t power on. Now on a Cisco PoE Switch, I’m used to just simply plugging in phones and getting power. With the Brocade… Continue Reading Brocade ICX 6450 PoE Configuration
%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
SNMPWALK and PortQry tools in Windows We all know that Linux offers some built in tools that are great for troubleshooting purposes, however Windows Operating Systems have limitations. Me being a Windows user primarily (fan of CLI and CLI based tools), I am always looking for different tools. In this post I want to mention… Continue Reading Using SNMPWALK and PortQry tools
Brocade ICX 6450-24P PoE and PoE+ Limitations and Configuration Recently ran into a minor issue when I was connecting Cisco Meraki MR72’s to a Brocade ICX 6450-24P. Connected 13 Cisco Meraki MR72’s. I was consoled into the switch so I noticed all ports showed getting power but the PoE was denied on port ethernet1/1/24. Looking… Continue Reading Brocade ICX 6450-24P PoE and PoE+
Linux Commands To Find Information Linux is very flexible and people do all kinds of things with Linux so that it can be utilized in a best way possible depending on the environment. Linux allows some awesome command line tools and the list is huge but few recent ones I used, I’d like to share… Continue Reading Finding information in Linux
[wifi]: wl1: PHYTX error Aerohive Access point Saw following errors in Aerohive AP230. 5 GHz radio won’t serve clients. Reboot or changing channels which resets the wifi1 interfaces fixes the issue temporarily. Looks like the issue may have been resolved in 8.2r5. Will update. 2019-03-22 09:26:29 info kernel: [wifi]: wl1: PHYTX error 2019-03-22 09:26:29 info… Continue Reading Aerohive – [wifi]: wl1: PHYTX error
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 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
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