Posts By Timothy

Today I came across an interesting case when troubleshooting an access list. The device was a Cisco 1921 which had an access list defined to permit certain hosts' incoming traffic from the outside to an FTP server. What was interesting is that the access list only contained permit statements (apart from the implicit deny at the end), but traffic from…

I've been thinking about my fitness quite a bit over the past few months. I'd always say as a teenager "I don't understand how people get fat. If they see themselves getting fat, do something about it!". It's easy to say that as a teenager when you can literally eat anything you want and not have to worry about stacking it…

Below is a short sequence describing the steps an ASA takes when authenticating VPN users. First, the user initiates a connection to the ASA. The ASA is configured to authenticate that user with the Microsoft Active Directory (AD)/LDAP server. The ASA connects to the LDAP server with the credentials configured on the ASA (ASAusername in this case), and looks up the user provided username.…

What's better than resolving a fault? It's a great feeling to finally resolve an issue that's been kicking your ass. I was troubleshooting a Cisco service earlier today which required some access lists be put in place to permit and deny some traffic. I managed to lock myself out of the router numerous times, but thankfully due to 'reload in 5',…