Problem: After setting up a site to site VPN tunnel on a Cisco ASA firewall, traffic was being dropped with the message “Inbound TCP connection denied from x.x.x.x to x.x.x flags SYN on interface Outside” The traffic inbound on this …
Overview: In this post, we are going to link an Azure Virtual Network to an on-premise network via a Cisco ASA. We will be creating a route-based connection using IKEv2 and a VTI interface. We are also going to focus …
I recently started to trial Zabbix 3.4 as a network monitoring solution, so far I really like it. Monitoring my Cisco LAN worked out the box using the built-in template “Template Net Cisco IOS SNMPv2”, however, this template would not …
Problem: I recently had to use some none Cisco 10Gbs copper SFP’s in a 3850 stack. On inserting the SFP’s the interfaces went into err-disabled status and looking in the log I was getting the message “Warning: SFP gbic-security check …
Have you ever looked at a comms cabinet run of Cisco switches only to find that ever interface is patched, some of them have no link lights and you don’t know which ones can be unpatched. The below steps are …
Become a subnetting Jedi and have fun at the same time! A collection of fun games to help perfect your subnetting and binary skills. Either pick a skill you want to focus on or play in shuffle mode. This is …
The below details how to recover a Cisco device such as a switch or router if you have forgotten or don’t have the password. You will need physical access to the console port WARNING: By doing this you may loose …
If you find yourself in ROMMON mode having done something silly like wiping the flash or if there was a problem updating the IOS then the below steps will go through how to copy a replacement image from TFTP to …
