Category: Networking
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VLAN 1002 – 1005 Unusable In Cisco Switches
I was recently working with a WISP doing some network upgrades, when I hit an issue I hadn’t stumbled upon before. Their previous engineer had set them up on VLANs 1001, 1002, 1003, and 1004. I tried swapping them over to using a Cisco 4948(which is a great switch) in their core, but as it…
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Install Cisco Virtual Wireless LAN Controller On Proxmox
This is quick and dirty instructions for myself in the future…sorry if they are short. First, locate the vWLC image you’d like to use. I chose MFG_CTVM_8_9_111_0.iso. Create a new VM in your virtualization platform of choice. Here I used proxmox. I created it with 2GB of RAM, two CPUs, 32GB of storage, and it…
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DIY USB Powered Fiber Tester
Using a cheap TP-Link media converter you too can make a portable fiber tester. The SFP cage allows you to swap optics to fit whatever fiber you’re trying to test. This particular media converter ships with a 9 volt wall brick, but fortunately it’s happy to run the SFP cage off of a 5V usb…
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Unimus Fails To Discover ASR9000 IOS-XR Routers Via Telnet
It appears that Unimus has an inter-connection timeout of 250Ms, and when telnetting to a Cisco ASR9K it needs to be adjusted to something more like 1 second. It seems that when a telnet session is opened to cisco via the discovery mechanism(trying to figure out if telnet is open), then instantly tries another connection…
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Bridging all VLANs Into/Through A VMware ESXi VM
Recently I was assisting with a Preseem server configuration. These boxes want to be bridged in the traffic path. If you want to do this in an ESXi VM, this can be a little obtuse. As per this VMware link, setting the VLAN to 4095 will instruct the vswitch to pass all VLANs through unmolested.…
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Accessing Geolocked Content The Easy Way With Mikrotik – MUM 2019 Presentation
This is a virtual light switch to turn routing rules on and off on a Mikrotik. My example here allows me to route my roku through a remote VPN, then easily turn that off. This allows me to access remote geolocked streaming video as well as local geolocked content. Here’s the presentation: Here’s my lab…
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ASR9000/IOS-XR OSPF Fun With MTU
I’m going to start by saying IOS-XR has some pretty cool features, I mean just look at the addition of “commit”. It does, however, have some quirks that can confound you, especially when you are migrating from one architecture over to the ASR9000 series. In particular, I’m going to look at the OSPF implementation. Here’s…