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Make Cisco Device Start Up From NVRAM Again
My ISR4321 was not remembering its config on startup even though I was sure to
Read more…write memoryafter making config changes. Turns out, the configuration registry was not set correctly. This post looks at what this registry contains and how to make sure it will load the stored config on bootup. -
Create or Import TLS Certificates on Cisco IOS
You can generate a self-signed certificate on Cisco IOS. If that fails, you can generate one on another machine and import it.
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Cisco IOS SSH
While connecting to a Cisco device out-of-band (i.e. not using IP) using a serial connection is the most secure way to configure the device, we also need to be able to connect over the network. Telnet works, but is not secure. So we need SSH. This posts looks at how to set up SSH with username and password on a Cisco device, how to use public-key certificates as a best practice to authenticate and how to disable SSH altogether if it is not needed.
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How to Set Up Minicom for Serial Access
If you want to connect to a networking device from Cisco or MikroTik, you get out-of-band access to the device over a serial console port.
Read more…minicomis one of several programs that can be used to talk to these devices over a serial connection. -
Configure Static DNS Entries on Cisco IOS
You can configure Cisco’s IOS to remember IP addresses for host, without having to resort to a DNS lookup. Very much indeed like adding an entry to your
Read more…/etc/hostsfile. -
Made a Typo? IOS Will Make You Wait for DNS Resolution
Another one of those Cisco IOS gotchas: when mistyping a command, you have to wait a minute before you get back a prompt. How to get back your prompt right away?
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Improve Annoying Console Logging of Cisco IOS
Let’s have a quick look at how to keep Cisco IOS from interfering with your prompt?
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STP
In this post, we will have a look at the venerable Spanning Tree Protocol (STP), what it is used for, and how to configure and verify it on Cisco IOS and MikroTik.
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Check OCSP With OpenSSL CLI Tool
How to query an OCSP responder to check the validity of a certificate?
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Open a ZIP File With Any Extension In Vim
What to do when you use Vim to open a zip file, but the file extension is not
Read more….zipor one of the other extensions known to Vim’s zip plugin?