Alexander Koponen https://techblog.koponen.se/ 2021-11-05T23:30:10Z Alexander Koponen writes about technology. Nothing fancy, just some notes, HOWTOs and other things relevant to a professional hacker. https://techblog.koponen.se/ 2018-11-01T20:39:00Z 2018-11-01T20:39:00Z I've finally started a techblog, nothing fancy. Just some notes and HOWTOs on technology. https://techblog.koponen.se/howto/aws/change-public-ipv4-address-on-an-instance/ 2018-11-06T12:00:00Z 2018-11-06T12:00:00Z Step by step notes on how to change the public IPv4 address on an AWS instance https://techblog.koponen.se/howto/cert/add-your-own-ca-to-google-chrome/ 2018-11-19T12:00:00Z 2022-02-03T18:53:48Z Step by step notes on how to add your own CA-certificate to Google Chrome https://techblog.koponen.se/howto/cert/create-your-own-ca/ 2018-12-21T12:00:00Z 2018-12-21T12:00:00Z Step by step notes on how to create your own CA and how to use it https://techblog.koponen.se/howto/ipv6/disable-the-ipv4-stack-in-freebsd/ 2019-01-10T12:00:00Z 2019-01-10T12:00:00Z Step by step notes on how to completely remove IPv4 from a FreeBSD machine https://techblog.koponen.se/howto/cert/install-private-key-and-certificate-into-an-hp-printer/ 2019-01-19T12:00:00Z 2019-01-19T12:00:00Z Step by step notes on how to add your own private key and certificate into an HP printer https://techblog.koponen.se/howto/email/view-calendar-attachment-in-a-linux-terminal/ 2019-01-20T12:00:00Z 2019-01-20T12:00:00Z Step by step notes on how to add your own private key and certificate into an HP printer https://techblog.koponen.se/howto/ipv6/adding-external-ipv4-access-to-a-service-on-an-internal-ipv6-only-network/ 2019-01-25T12:00:00Z 2019-01-25T12:00:00Z A brief example on how to setup an IPv4 capable load balancer (HAProxy) in front of an IPv6 only network https://techblog.koponen.se/howto/encryption/use-gpg/ 2019-02-05T12:00:00Z 2019-02-05T12:00:00Z A quick tutorial/reference on HOWTO setup and use GPG (GnuPG) https://techblog.koponen.se/howto/streaming/hls-streaming-with-nginx-rtmp/ 2019-02-28T22:55:42Z 2019-07-05T13:00:00Z Notes on how to setup NGINX as an RTMP to HLS streaming server https://techblog.koponen.se/howto/vpn/install-openvpn-server/ 2019-02-28T10:54:37Z 2019-02-28T10:54:37Z Howto install OpenVPN server https://techblog.koponen.se/howto/vpn/use-openvpn-profiles/ 2019-02-28T16:03:10Z 2019-02-28T16:03:10Z Howto install an OpenVPN server https://techblog.koponen.se/reviews/popos-on-clevo-laptop/ 2019-03-16T11:21:45Z 2019-04-15T12:00:00Z A review on using Pop!_OS on a Clevo Laptop https://techblog.koponen.se/howto/vmware/post-install-procedures-to-secure-a-vmware-esxi-host/ 2019-03-29T12:00:00Z 2019-03-29T12:00:00Z Step by step guide on how to secure a newly installed VMware ESXi host https://techblog.koponen.se/howto/vmware/add-a-new-user-to-a-vmware-esxi-host/ 2019-04-12T15:05:06Z 2019-04-12T15:05:06Z Step by step guide on how to add a new user to a VMware ESXi host https://techblog.koponen.se/howto/vmware/reset-the-lockout-counter-on-a-vmware-esxi-account/ 2019-04-13T09:03:44Z 2019-04-13T09:03:44Z Step by step guide on how to add a new user to a VMware ESXi host https://techblog.koponen.se/howto/ethernet/notes-on-using-ubiquiti-edgeswitch/ 2019-08-26T12:00:00Z 2019-08-26T12:00:00Z Notes on how to get started with an Ubiquiti Edgeswitch without compromising security https://techblog.koponen.se/howto/ethernet/ethernet-over-usb-on-raspberry-pi/ 2019-12-22T12:00:00Z 2019-12-26T12:00:00Z How to use Ethernet over USB on Raspberry Pi https://techblog.koponen.se/howto/filesystem/zfs-on-raspberry-pi/ 2020-01-13T12:00:00Z 2020-07-27T12:00:00Z ZFS on Raspberry Pi https://techblog.koponen.se/feed/ 2020-09-27T12:55:59Z 2020-09-27T12:55:59Z Blog has moved to https, added HSTS and... now there's a feed page, with an atom.xml https://techblog.koponen.se/howto/markdown/insert-a-blank-line-inside-a-markdown-code-block/ 2020-09-29T02:13:32Z 2021-01-05T13:09:40Z A very short note on how to get that highly sought after blank line https://techblog.koponen.se/howto/www/install-apache-https/ 2020-09-29T20:45:40Z 2020-09-30T23:37:24Z Complete tutorial on how to setup an Apache web server. This includes: virtual hosting, Let's Encrypt certificates, HTTPS, 301 redirection and HSTS. https://techblog.koponen.se/howto/filesystem/webdav-on-apache/ 2020-10-03T17:53:43Z 2020-10-03T17:53:43Z Some notes on how to get started with WebDAV on Apache. https://techblog.koponen.se/howto/www/https-routing-with-haproxy/ 2021-01-05T12:48:27Z 2021-01-05T12:48:27Z HTTPS routing with HAProxy https://techblog.koponen.se/reviews/popos-on-raspberry-pi-4/ 2021-11-05T23:30:30Z 2021-11-07T00:24:49Z A very brief review of Pop!_OS on Raspberry Pi 4 https://techblog.koponen.se/howto/cert/install-private-key-and-certificate-on-openwrt/ 2021-11-07T17:34:37Z 2021-11-07T17:34:37Z Step by step notes on how to install your own private key and certificate on OpenWRT https://techblog.koponen.se/howto/cert/install-private-key-and-certificate-on-wireless-router-gl-inet-gl-ar750s-slate/ 2021-11-07T18:34:17Z 2021-11-07T18:34:17Z Step by step notes on how to install your own private key and certificate on wireless router GL.iNet GL-AR750S Slate https://techblog.koponen.se/howto/dns/notes-on-dnssec-on-bind/ 2021-11-24T08:02:40Z 2021-11-24T08:02:40Z Just some brief step by step notes on how to enable DNSSEC for a DNS zone on BIND 9 https://techblog.koponen.se/howto/linux/the-best-way-to-learn-linux/ 2022-01-07T03:00:24Z 2022-01-31T19:31:23Z I often get the question: "What's the best way to learn Linux?" and I can almost never refuse to answer, as if the question would be my biggest and most obvious trigger. But the answer can be quite long, not only because there's a lot of knowledge and experience to transfer, but also because I want to be sure you stick with it. In this article I've gathered all my thoughts and opinions on how someone should go about learning Linux. It wont explain how you do things, but rather which things you should do, in which order and why. You can view it as an advanced list of goals and checkpoints. I hope this helps! https://techblog.koponen.se/howto/cert/add-your-own-ca-to-linux/ 2022-02-03T17:18:34Z 2022-02-03T17:18:34Z Step by step notes on how to add your own CA-certificate to Linux https://techblog.koponen.se/howto/cert/add-your-own-ca-to-firefox/ 2022-02-03T19:22:05Z 2022-02-03T19:22:05Z Step by step notes on how to add your own CA-certificate to Firefox https://techblog.koponen.se/howto/videochat/install-jitsi-server-with-docker-compose/ 2022-10-23T19:52:52Z 2022-10-23T19:52:52Z Step by step notes on how to install a Jitsi server with Docker Compose Also including how to maintain (update) the Jitsi server and a whole bunch of complaints on why IPv4 NAT is such a pain. https://techblog.koponen.se/howto/ssh/verify-ssh-host-keys-with-ssh-ca/ 2022-11-02T16:10:47Z 2022-11-02T16:10:47Z Brief notes on how to verify SSH host keys by setting up SSH CA https://techblog.koponen.se/howto/yubikey/notes-on-using-local-sudo-with-yubikey/ 2022-12-25T10:51:20Z 2022-12-25T10:51:20Z Brief notes on how to setup sudo on your local machine so you can authenticate with just the touch of a YubiKey. https://techblog.koponen.se/howto/yubikey/passwordless-remote-server-administration-with-ssh-sudo-and-yubikey/ 2022-12-25T14:35:22Z 2022-12-25T14:35:22Z A working proof of concept on how you can configure a server to only allow SSH login via YubiKey (U2F key) hardened key pairs and then use the same YubiKey mechanism (pressing the YubiKey "button") on the client side in order to gain sudo on the server, all while having no passwords anywhere.