Archives for August 2009
Collection of useful, relevant or inane places on the the Internets for 26th Aug:
- Practical Guide to Troubleshooting with Traceroute – Think you know all about Traceroute. Think again. Very well done presentation at NANOG on the ART of troubleshooting with Traceroute. If you need a practical reminder that not all in networking is as it seems, then this presentation covers some of the obvious mistakes that beginners make. Good insights into the gap between certification (theory) and experience (practice). They don't put this into the text books. (via @pello)
- IETF RFC 5625 – DNS Proxy – good meaty troubleshooting tips to be found in here. – This IETF RFC on DNS Proxy is full of meaty goodness about real life problems with DNS and Firewalls. While specifically target at low cost ADSL router / gateways with cheap DNS Proxy software (i.e. incomplete or poorly programmed), there are lots of good ideas on what can go wrong if you are implementing DNS inspection on a firewall. For example: The EDNS packets are larger than 512 bytes. The default inspection on PIX/ASA V6/7 code was to force the 512 byte limit, which is now wrong. The default in ASA/PIX is to leave this option off, but if you have upgraded you can get some weirdness until you allow larger size DNS packets.
Collection of useful, relevant or inane places on the the Internets for 21st Aug:
- Fragments ” Blog Archive ” Microsoft Network Load Balancing (NLB … – Microsoft Network Load Balancer is a stupendously bad idea. As soon as it’s implemented the pain starts, and doesn’t stop until you replace it. I love when customers tell me horrible war stories about getting it working because I laugh at them and show them what you can do with Cisco IOS Server Load Balancing. The look on their faces – bloody priceless!!!!A great article on the problems, the solutions and why you should not use Microsoft NLB.
- CCIE Hall of Fame – CCIE Hall of Fame – Someone is maintaining a list of every CCIE they can find. It’s kind of creepy and, like a lot of social networking, I feel like I am being stalked by the entire world. No one needs to know this stuff. Please stop.
A table for my own reference. Nothing to see here. Please move on.