Category: Other stuff…
Exchange 2007 with ISA 2006
Today I have be working on publishing Microsoft Exchange Outlook WebAccess and Active Sync to the Internet. We had some discussions with some Microsoft Consultants about a secure way to publish Outlook Web Access to the Internet, especially the authentication part of such a solution. Some people are talking about publishing OWA directly to the … Read More
Network simulator
More often I have to change critical configuration options in live environments, but sometimes I don’t no the effect of these changes on the network. So I would like to build a test network where I can check the impact of the configuration changes. A good network simulator would definitely help in this situation. Cisco … Read More
Port-channel Cisco vs. VMware ESX
I have had different discussions with different customers about the load-balancing algorithms between a Cisco switch, configured with a port-channel and a VMware ESX server using multiple NICs. Our VMware consultants always choose Route based on IP hashes as load-balancing algorithm. This means that load-balancing happens on layer 3 of the OSI model (source-destination-IP). In … Read More
HP ProCurve licenses
During an check-up on a network, I looked at the configuration of two HP ProCurve 5400zl switches. One of these switches functions as the core switch and default gateway for the various VLANs. To improve the availability and redundancy of the default gateway, I mentioned the configuration of VRRP (Virtual Router Redundancy Protocol). On of … Read More
Cisco Networkers 2008
Cisco Live (aka Cisco Networkers) 2008 has opened the registration for Orlando, Florida. Cisco Live is Cisco’s annual IT and communications conference. The conference features Networkers, the premier education and training program, and other special programs designed to meet the diverse needs of today’s IT and communications professional from increasing technical proficiency to understanding the … Read More