ICMPv6 ‘Multicast Listener Report’ flooding the network

Today I had a very big network problem! Since 4 o’clock a customer told us, that the network printers aren’t available and a wireless link to another location can’t be used anymore. I watched at the PRTG monitoring software and the network-ports from the HP switches were at high load/traffic:   and this was on every network port! So … Read more

Router on the edge

Good morning everyone! Today I want to explain a configuration for routing internal networks with a layer 3 routing switch and a router for accessing the internet. I call it “router on the edge”. The definition “edge router” is typically a router running EBGP (External Border Gateway Protocol) so I invent a new definition 🙂 … Read more

Updating HP ProCurve Switches

Finally back from USA I will deliver you a new tutorial to update your ProCurve switches. In most cases you will need to do an update on the software because your new installed GBIC modules are not recognized. Don’t ever install directly to the newest version because most updates need a new Boot ROM, so … Read more

Router on a stick

Today I will show you how to build a so called “Router-on-a-stick” environment. In this example we have one Cisco router, one HP ProCurve switch and three subnets: First we configure inspection firewall profiles, so when someone requests packets from the internet, packets can come back through our inbound WAN interface access-list ip inspect name … Read more