Perfection is achieved, not when there is nothing more to add, but when there is nothing left to take away.
Date Archives → October 2017
Can we reduce the 150ms to the “internet”?
During one of my training sessions someone asked me:
Why is it that none of our providers can give us a ping shorter than 150ms to the “internet”?
And the simple answer is: We can’t beat the physics!!
Let me explain:
Packet Capture Capabilities of Cisco Routers and Switches (Mind Map)
From very early in my networking career I have been fascinated by protocol details, packet captures and the features of my top 3 application troubleshooting tool: Wireshark.
Getting the captures on the endpoints (clients/servers) is relatively easy but things can get difficult when you want to capture traffic somewhere in between and is hard to do port mirroring (SPAN) on some remote switch.
Packet Capture Capabilities of Cisco Routers and Switches is an old video (4 years is old right?) posted on the Cisco Support Forums that highlights different methods to get on box packet captures in Wireshark .pcap format or in text output.
The video is an hour long but if you’re in a rush I made it easy for you by summarizing the video in an “easy to read” mind map. grouped by IOS, NX-OS and IOS XR. Continue reading
KRACK—Key Reinstallation Attack
KRACK is the short name for an attack to the WPA (Wi-Fi Protected Access) security protocol, both WPA1 and WPA2. The vulnerability allows Wi-Fi traffic to be decrypted withouth knowledge of any keys even when using “secure” encryption like WPA2 (personal or enterprise).
Continue reading