IBM Blade with Nortel and HP switches
Today I had to troubleshoot an IBM Blade system. The customer was complaining that all servers, except one, weren’t able to communicate with the rest of the network. The blade system contains two Nortel switches. Each Nortel switch is connected with a 3 Gbps LACP channel to separate HP switches. The HP switches are the … Read More
Auto Backup Configurations
Till recently I didn’t have a decent way to backup configurations from routers and switches without using some kind of management tool, like Cacti or Nagios. I wanted to automatically backup configurations by only using a TFTP or FTP server on a network. I started looking and found the solution by using the archive and … Read More
Blog offline.. and online again
This blog was offline for a couple of days, because my ISP thought it would be cool to change the public IP address. I bought a house with my girl and we are still rebuilding the place. However the end is near. I already signed up with an ISP, which is XS4ALL. It is always … Read More
Automatic Log In Reverse Proxy with FBA
Recently I configured another ISA 2006 server as reverse proxy to publish the Exchange 2007 OWA environment on a secure way to the internet. The customer where I configured the reverse proxy is migrating from Novell GroupWise to Microsoft Exchange. During the migration period, the customer has specific requirements when connecting to the webmail environment … Read More
ISA 2006 Authentication over HTTP
I implemented different ISA 2006 Reverse Proxy servers in conjunction with Microsoft Exchange 2003 or Windows Exchange 2007. Today I configured ISA 2006 with Exchange 2007. I configured the Reverse Proxy server as I did always. And the connection from outside the network works perfectly. On the internal Exchange server I configured Basic and Integrated … Read More
Configuration Example, Security, Switching
Layer 2 security
I attended the session layer 2 security, because I had some discussions about layer 2 security with one of my colleagues. We were discussing about using layer 2 security and especially implementing it in the environments from our customers. Looking at my/our customers, I don’t see environments where layer 2 threats would be immediate. But … Read More