Founded by Kunihiro Ishiguro and Yoshinari Yoshikawa the founders of GNU Zebra, came together to form IP Infusion back in 1999 as a commercial-grade, hardware-independent networking software company. If you’re not familiar with Zebra, you probably know it’s little brother Quagga which powers everything from Cumulus Linux to Vyatta and even my old digs.. Imagestream […]
PCAP or it didn’t happen…. The t-shirt!
Some days I don’t know why I do things… But last night I was playing around with creating a PCAP meme when my friend Josh Kittle said he’d be interested in a t-shirt like that. I got to thinking about it and realized some network engineers out there also might enjoy something like this, so […]
Using Discontiguous Wildcard Masks in ACLs
Unlike subnet masks, wildcard masks allow you to use discontiguous bits which enable you to match on a range of values. Using these within routing protocols is typically frowned upon, if not outright prohibited. Unfortunately, there are those individuals who strive to trim every line they can from their ACLs. Can you say job security […]
Poor man's VPN connection
Have you ever needed to access a site that had an IP restriction, or one inside your remote network? Recently I need to access a customers remote monitoring site, but its restricted to a small subnet of IPs. They had no VPN setup for me, so I had to come up with something new… The […]
Netcat – secret weapon
Netcat or nc, is a forgotten tool in too many arsenals these days. It lays dormant waiting at the command line to make connections across the globe for you. Knowing how to use it, could ease many of your day to day tasks. Simply put, netcat creates a TCP socket either in listening mode (server) […]
Using /31 subnets for point-to-point interfaces
Recently a “colleague”, I use that term very loosely here, was reviewing my recommendations for changes on his network. Since they’re rather tight on public IP space, and require it for a few of their PTP links, I had suggested changing them to /31 subnets. His response was less than accepting of the changes as […]
