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Cisco IOS & SNMP: A backdoor into devices you can’t access.
We’ve all been there. You desparately need to get into a router or a switch, but every username and password you try doesn’t seem to work. Or even worse, you can ping the device, see it in CDP but SSH isn’t replying and telnet is disabled (presumably because the device…
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FlexVPN: Spoke-2-Spoke PSK
So in my last post I covered configuring FlexVPN with dynamic spoke to spoke communication using certificates for authentication. What if you wanted to use pre-shared-keys though? We can do that, it’s not nearly as secure as certificate based authentication, but we can do that. We’ll be using the exact…
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FlexVPN: Spoke-2-Spoke Tunnels
Let’s talk about FlexVPN, a prime contender as a DMVPN replacement and sometimes referred to as DMVPN phase 4. In this post, I’m going to explore the nuts and bolts of getting FlexVPN up and running between (3) routers and, for added flare, I’m going to also configure dynamic spoke-2-spoke…
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Protect The LAN: IPv6 RA Guard
So while nerding on YouTube, one of my favorite YouTubers Quidsup did a demonstration of using Kali Linux to perform a pretty nifty denial of service attack against Windows 10. The attack has some minor caveats, but none the less is dangerous and relatively easy to pull off. It works…
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Routing authentication – Thinking outside the box.
So it’s been awhile since my last post, and while I could just blame work, really I hit a bit of a dry spell. Then I saw a topic show up on CLN that sparked my imagination. The topic was simple enough, which authentication method is better (specifically for EIGRP)…
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OSPFv3 for IPv4 (hooray address families!)
OSPFv3 is a pretty slick upgrade to OSPFv2. Most of us know as much, but in an IPv4 world we’re all just stuck… waiting. Well with recent updates to IOS (I noticed it available in 15.3 – which can run on a 7200 in GNS3 for all you labbers at…
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EIGRP OTP – Looking closer part 1
So I’m going to break my closer look at EIGRP Over the Top into a couple smaller posts. Maybe I’ll tie it together with a video when I’m done… maybe lol. So today I thought I’d answer the most basic question of OTP, how the hell does it work?! In…
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EIGRP just went… Over the TOP!
So I did a short video with my initial configuration/look at EIGRP OTP. Just thought I’d share it out here as well. I’m going to be looking into it a little more in-depth in the next post, but until then!
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New Trouble Ticket — OSPF NSSA and full reachability
So I bumped into a pretty similar task in my studies not too long ago, and decided tonight that it would make for a pretty good blog post. So first things first, here’s our network diagram (sorry it’s not as pretty as usual, but suck it up butter cup). If…