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Run SpinRite on Librem 5 Internal Storage
I have a Purism Librem 5 Linux phone. The Evergreen batch has 32 GiB of flash storage. In this post I will show how to run SpinRite on that drive.
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Convert Linux into NAT Router
Sometimes it comes in handy to have a Linux box act as a router. You might not have a switch lying around. You might want to monitor all traffic coming and going to some device. In this post, we will set up Linux to act as a simple IPv4 NAT router.
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Create Server Backup from Local Machine with Borg
How to back up your servers with borg? One way to do it, as documented by the fine borg documentation, is to use a pull backup using sshfs. The idea is to mount the remote filesystem in a local directory, chroot into it, and run borg inside the chroot.
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Updating My Cisco 4321 Router's IOS over HTTP, FTP and TFTP and More
I recently got my hands on a second-hand Cisco 4321 router. First things first, I want to upgrade to the latest IOS version so I have the latest security patches. Having no experience at all with IOS, these are some things I learned along the way.
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Authentication on Cisco IOS
Let’s have a look at how Cisco IOS handles authentication and how passwords are stored in the configuration file.
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Set the Time Manually or with NTP on Cisco IOS
Let’s take a look at how to set the clock on a Cisco device.
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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.