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Why Is This Website Port Scanning Me?
Investigation of the practice of port scanning site visitors for fingerprinting and tracking.
Top posts
Every blog post that took off on Hacker News, ranked by the votes of its best submission. 127 posts.
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A Facebook crawler was making 7M requests per day to my stupid website
Francesco Napoletano is a highly competent staff software engineer with 20+ years of experience developing a wide range of tools and applications for the web stack.
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Another free CA as an alternative to Let's Encrypt
Let's Encrypt is an amazing organisation doing an amazing thing by providing certificates at scale, for free. The problem though was that they were the only such organisation for a long time, but I'm glad to say that the ecosystem is changing. It's always a good idea
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Does Apple really log every app you run? A technical look
Apple’s launch of macOS Big Sur was almost immediately followed by server issues which prevented users from running third-party apps on their computers. While a workaround was soon found by people on Twitter, others raised some privacy concerns related to that issue.
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A detailed look at the router provided by my ISP
I have been living in my current apartment for more than a year now and I noticed I have never inspected my router which was provided by my ISP when I moved in. The only thing I changed in router is
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Wireless Is a Trap
Over and over again, I’ve seen people fix some wireless-related problem and go “wow, I had no idea how much better this could be!" • Wireless protocols often silently operate in an extremely degraded state that makes them substantially worse than wired equivalents.
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Ok Google: please publish your DKIM secret keys
The Internet is a dangerous place in the best of times. Sometimes Internet engineers find ways to mitigate the worst of these threats, and sometimes they fail. Every now and then, however, a major …
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Building a Simple VPN with WireGuard with a Raspberry Pi as Server
Now that wireguard will be part of the upcoming Linux 5.6 Kernel it’s time to see how to best integrate it with my Raspberry Pi based LTE-Router/Access Point Setup. What is my scenario? Raspberry Pi 3 with a LTE hat, using a public IP address. This will be the VPN server (called edgewalker in this post) An Android…
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NAT Slipstreaming
exploit NAT/firewalls to access TCP/UDP services bound to any system behind victim's NAT
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72% of smart TVs and 46% of game consoles hardcode DNS settings
Welcome Hacker News readers!• Thank you to M. Hammad Mazhar for his research that inspired this guide.• @healyio made some great additional suggestions in th...
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Fun with IP address parsing
A quick rundown of the many text representations of IP addresses.
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eBay is port scanning visitors to their website
Websites are scanning for open ports on your PC to help fight fraud, but this data also flows into a massive, global tracking database.
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Cloudflare is turning off the internet for me
A classically trained sysadmin shouting into the void.
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How 1500 bytes became the MTU of the internet
Ethernet is everywhere, tens of thousands of hardware vendors speak and implement it. However almost every ethernet link has one number in common, the MTU:
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Moving your SSH port isn’t security by obscurity
I just came across another post on Hacker News talking about why you shouldn’t move your SSH port off of 22 because it’s Security by Obscurity. Ther
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Ignore AMP
In 2018, my recommendation was to avoid AMP, to use AMP for the most relevant pages, or to use AMP only. In 2020 my recommendation is to ignore it, because AMP largely appears meaningless now. <cite>Upgrade Your HTML II</cite> gives an opinionated idea why.
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First trans-Atlantic contact made on 432 MHz
On Tuesday the 7th of April 2020 , a remarkable contact was made with the FT8 digital mode on 432 MHz between D4VHF on the Cape Verde Is...
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Small mail server best current practices
(This post was originally written as a reply on the mailop mailing-list, but a friend asked me to turn it into a blog post. I’ve edited it, mostly adding more links to elsewhere, but there are some additions here.)
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How Do Routers Work, Really?
An accessible overview of how exactly a router works, with code examples.
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Getting Started with WireGuard
Software developer
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What developers should know about TCP
Why do you need to place your servers geographically close to your users? One of the reasons is to achieve lower latencies. That makes a lot of sense when you are sending short bursts of data that should be delivered as quickly as possible. But what about large files, such as videos? Surely there is a latency penalty…
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Show HN: I reverse engineered my cable modem and turned it into an SDR
A few weeks ago I got curious about an old cable modem sitting in my closet, a Motorola MB7220. Initially I was interested in what kind of hardware it had and if it was running Linux. Some quick searching brought me to a thread on a web forum where people were discussing the built in spectrum analyzer feature used for…