Let's Encrypt with DNS-01 on ER-X

This article assumes you already have configured a self-signed certificate for Edgemax GUI. If not, skim through my previous post to gain some background. We want to replace a self-signed certificate with a certificate signed by Let's Encrypt that works for every single browser anywhere without any extra work. We'll…

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Time to Retire OpenVPN

Recently I setup a test instance of Shadowsocks on my RT-AC56U (Cortex-A9 clocked at 800Mhz). I did quick benchmarks to compare its throughput against my other VPN builds. Here are the three contestants on the server side: IKEv2 IPsec VPN on ER-X; AES128 + SHA1; hardware accelerated OpenVPN on RT-AC56U; AES128…

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IPv6 Worldwide Adoption Today

Early 2016 Ars Technica reported that worldwide IPv6 adoption reached 10% after twenty years of IPv6! Let's do some check today. IPv6 is currently near 20% adoption worldwide as measured by Google. That's double that one and a half year ago. Amazing! The world is embracing IPv6 at accelerated pace.…

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DHCPv6 Prefix Delegation for IPv6

Updated: Jul 8, 2018 I recently switched ISP and gained native IPv6 connectivity. Googled for instructions to setup IPv6 on my ER-X. None of the articles and forum discussions that I found helped me complete the mission successfully. DHCPv6-PD is commonly used by ISPs to dispatch IPv6 addresses to users.…

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Let's Encrypt, Kazoo It! and Cloudflare

I've heard of Let's Encrypt for a while but never spent time to try it out until recently. Here is my experience for getting a certificate for this blog. I first went with the official client known as certbot. Ran it on a Debian VPS that hosts this blog. Right…

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Idling BitTorrent Attracts Malicious Visitors

My firewall has few very ports opened. Unsolicited visitors to these ports are logged and banned. Unsolicited visitors to other ports where I don't have a service running are silently dropped. It's not unusual to log millions of such silently dropped packets in a typical month. For example, in the…

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Extend iPhone Battery's Lifetime

We touched upon iPhone batteries in two previous posts. When the capacity of Li-ion batteries drops to 80% of brand new cells, they're considered EOL. What reduces the cells' ability to hold charges? Apparently there're chemical processes at work between charging/discharging. The processes develop oxidation at the negative electrode.…

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