How to kill a hung VMWare Guest on ESXi
Here’s an updated post on how to kill a hung vmware guest using ESXi CLI on 4.x and 5.x Alright, I ran into a hung VM. There’s a guest in my cluster that wouldn’t stop or restart. Hitting the stop…
Articles by Alfred Tong
How to kill, logoff, or disconnect a Cisco ASA remote access VPN session
Problem: Have you ever wondered how you logoff or disconnect a remote access VPN user on a Cisco ASA? Well there are two ways to do it. One is to use the GUI – Cisco’s ASDM and the other by…
How to view the pre shared key on a Cisco ASA/PIX configuration
Ever noticed when you issue a show running-config on a ASA to look up the VPN tunnel pre shared key and it appears as a “*”? Well here’s how to find out what the key is! more system:running-config This will…
Free Cisco Tools
Can’t beat free can yeah? I never knew there were that many free Cisco tools out there! I stumbled upon Brad’s site and he’s got a hefty list! I’m bookmarking this on my site. http://www.bradreese.com/cisco-tools.htm This is my personal favourite…
How to own your own domain name
It’s been a while since I’ve blogged. This is the first post since I’ve moved my old blog http://springdom.blogspot.com to my new home. So I’ve decided to document what I went through. These few months I’ve been toying around owning…
Troubleshooting VPN slowness – A look at MTU
Problem: Troubleshooting vpn slowness and packet retransmits could be a puzzling task, especially when it’s over an IPsec tunnel. Last week I had the opportunity to troubleshoot a problem with slow website loading times on a webserver across the link….
100Mb Half Duplex problem between Cisco switch and Linux system
Today I ran into a weird scenario where a Linux system’s NIC would set itself to 100Mb half duplex regardless whether the device and NIC was manually configured to operate at full duplex. After strolling through Cisco’s website Troubleshooting Cisco…
Demystifying ASA/PIX Nat 0 vs Static
Firstly, Nat 0 and static can be used to achieve the same result of bypassing NAT, at least logically 🙂 However both are fundamentally different. Take a look at the following example: nat (inside) 0 192.168.1.1 255.255.255.255 and static (inside,dmz)…
Cisco ASA allowing management-access from VPN
The inside interface of the PIX (also applies to ASA) cannot be accessed from the outside or from the other side of the VPN tunnel unless the management-access is configured. Once management-access is enabled, Telnet, SSH, or HTTP access must…
Cisco ASA Failover Tips and misc.
When setting up a Cisco ASA failover pair, try to follow the following rules & tips: Do not use a crossover Ethernet cable or a fiber-optic patch cable to directly connect the two failover LAN interfaces if the firewalls are…