Recent Posts - page 4
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Lab Fun with Fish: My Little Lab Setup Gets a Major Overhaul
For digital CiscoLive 2020 I will be creating a number of follow up addendum videos to CLUS 2019’s BRKRST-2414 session “Network Sleuthing with Stealthwatch: The Science of Investigation” . These videos will be uploaded to the www.ciscolive.com on demand library… Read More ›
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Network Detective Series: Troubleshooting Method Ride-A-Long
“Hey Fish, how good are you at BFD? None of my BFD neighbors will come up.” Two simple sentences and I am “hooked.” I love troubleshooting! Troubleshooting is just a blast for me! It’s like being a Network Detective trying… Read More ›
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Fun in the Lab: Troubleshooting DMVPN Per-Tunnel QoS
In Playing in the Lab: DMVPN and Per-Tunnel QoS we looked at DMVPN per-tunnel QoS. We looked at how to configure it…. how the vendor private extensions in RFC2332 are used in the NHRP registration request… and how to see,… Read More ›
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A Career Planning Ride Along with Fish
February 15th, 2020 Updated Comment: Back in July of 2017 I went thru the first “real” re-org in my career. Yes, of course I had been through other re-orgs. But none of them really significantly impacted my primary day to… Read More ›
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Playing in the Lab: DMVPN and Per-Tunnel QoS
There is this really cool thing about DMVPN that I came across a while back: DMVPN Per-Tunnel QoS. Apparently it isn’t just me (as a lab rat) that thinks this is cool. Every time I show this to people I… Read More ›
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Fun in the Lab: Sniffer Tracing a DMVPN Tunnel Startup
I have seen that for many people new to DMVPN… it seems quite overwhelming and scary. I will admit it was that way for me also. I think really cause of all those nhrp commands. Funny thing about those nhrp is that these items… Read More ›
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Spirent Test Center Series: Part 2 – OSPF, BGP and Running Traffic
Part 2 of our Spirent Test Center Series will cover what I find to be the most common use cases for configuring the Spirent Test Center for proof of concept type labs for OSPF, BGP and also for traffic that… Read More ›
Featured Categories
Network Detective ›
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Why IT-Site1 Can’t Ping OT_Site1R – Show and Tell Time #1
September 9, 2025
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Troubleshooting OT Security: Why IT-Site1 Can’t Ping OT_Site1R
August 27, 2025
BGP ›
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BGP Graceful Restart on the Cisco FTD: Part 2 – Seeing it “In Action”
May 17, 2022
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BGP Graceful Restart on the Cisco FTD: Part 1 – Configuring
May 17, 2022
Multicast ›
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mVPN Fun in the Lab: Troubleshooting the MVPN Cloud – Part 6 of 6
March 29, 2019
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Network Detective Ride-Along: Troubleshooting Multicast
May 27, 2018
IPv6 ›
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Understanding IPv6: Solicited-Node Multicast In Action (Part 7 of 7)
February 22, 2018
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Understanding IPv6: The Ping Before Solicited-Node Multicast (Part 6 of 7)
February 22, 2018
MPLS ›
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Troubleshooting Basic MPLS L3VPN – Part 2 – MPLS
February 23, 2021
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Troubleshooting Basic MPLS L3VPN – Part 1 – BGP
February 23, 2021