If you have ever been blacklisted for sending spam there is a good chance the source of those emails was not your mail server but a compromised computer inside your network. So, how do you combat this? [Read more…] about Block spambots on compromised PCs.
While this isn’t exactly ground breaking stuff I thought it might serve as a nice refresher to those that dabble in the Cisco CLI. [Read more…] about Three Cisco IOS commands you can’t do without.
I was recently building a VMware ESXi multi-host environment with a LeftHand Virtual SAN and I needed 6 Port Groups for my design. I already had one pre-existing Port Group that was a 2GB uplink to my Layer 3 switch.
Everything was going great until I tried to create Port Group number 7. This seemed odd to me as I knew my IOS version should at least support 128 Port Channel Groups.
After some digging I discovered this 2960G only supports 6 Port Channel Groups. This was unfortunate but not a deal breaker. I knew I would not be using Vmotion very often on this cluster so I let that run on a single Gigabit Ethernet port. This allowed me to re-architect my solution for only 4 Port Channel Groups.
Just thought I’d pass this one along. You don’t often see switches restricted to this few port-groups.