I recently had to deploy a couple of Nexus 9k switches in a couple of new DC's at work which has been setup as a greenfield environment utilising VXLAN and BGP EVPN which is all managed by DCNM. This means that instead of being able to quickly and easily deploy and configure switches you have to use the GUI garbage that is supposedly the way of the future. If you can't tell, I'm not a fan of SDN. In my opinion, any half decent network engineer knows that while SDN has its place and benefits, its 100% not in the day to day operations of a network.

Recently at work we have run into an issue with TCAM space on some of our switches due to the large number of ACL's. So i decided to do some digging into TCAM and how ACL's use the space etc. 

Well I picked up another micro pc. This time it was a Dell optiplex 7060 micro and I must say it's quite a nice little box. It's got an 8th gen core i5, 6 core CPU so nothing fancy but will do for what I need, 16GB of RAM but I will be upgrading that to 64GB and it came with a 256Gb nvme drive and has capacity for another 2.5" drive which I'll probably chuck a 1TB SSD in given that should suffice for my lab requirements. 

As I mentioned in my previous post, I have started building a home lab. And by started I literally mean I've got a single NUC (Which I picked up for a bargain price off eBay) and I've installed ESXi on it. I currently only have a couple of Linux VM's running at the moment, one of which hosts this website.

It's been a few years but I've finally gotten back to setting up a new website for wr-mem. This site is a work in progress and I will try to update it regularly as I go and learn new things. I'm currently building a home LAB environment which should provide me with a lot of potential content. I also use this site to record issues that I come across or new content I learn and Lab in the hopes that it will help others as they learn and explore. 

Once again, configuring a new ASA Firewall and I've gone to SSH into it using SecureCRT and found I can't. When I attempted to SSH, I received the following error. 

Key exchange failed.
No compatible key-exchange method. The server supports these methods: diffie-hellman-group14-sha256

I started reading about IPv6 because well it's about time and given I run it at home I probably should so I started reading the Cisco IPv6 Fundamentals book. And I guess let's start from the the basics of IPv6 addresses. 

Anything I lab will go here

This page is used to show specific examples of packet captures for things like OSPF neighbour adjacency exchange, or EIGRP neighbour adjacencies etc. I find these very helpful to go through when learning about various networking technologies like routing protocols or learning about STP messages etc. 

To start with, this is a capture of an EIGRP neighbour relationship forming between two adjacent routers within the EIGRP AS 100. You can click on the screeshot to download the actual wireshark PCAP file to inspect the packets further.