Aaron's Worthless Words

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Network Protocol Overhead

Here are some packet overhead numbers for a few popular protocols to help with doing bandwidth requirement calculations. This may be another add-as-we-go post, so please comment with additions or corrections. Ethernet : 20 bytes Frame Relay : 4 – 6 bytes PPP : 6 bytes MLPPP: 10 bytes MPLS : 4 bytes IP : 20

Stubby Post - A Story on VPN Hardware Acceleration

We use a hosted application that requires IPSec tunnels to the provider from different properties across the country. The ones in the lower 48 perform adequately, but the new one in Alaska is absolutely horrible. The RTT from the continental US sites was around 80ms, but the same from the

QoS Pre-classify and Class-map Order

I’m still studying for the ONT test, so I did some labs tonight. One of them was to demonstrate the qos pre-classify command for tunnel interfaces. When you have a packet sent over a GRE tunnel, the ToS field gets copied to the GRE packet, but there’s no

GRE Tunnels and Encryption

GRE tunnels rock. They are interfaces on a router that are used to “connect” to another router somewhere on your LAN, your WAN, the Internet, wherever. The most popular use for them is for router-to-router VPNs. I’ll let my friend Josh from blindhog.net show you how to do