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Networking & Internet

The most popular blog posts about networking & internet on Hacker News. 223 posts.

2025
123

Kerberoasting

I learn about cryptographic vulnerabilities all the time, and they generally fill me with some combination of jealousy (“oh, why didn’t I think of that”) or else they impress me w…

126

Moving from OpenBSD to FreeBSD for firewalls

You're probably reading this page because you've attempted to access some part of my blog (Wandering Thoughts) or CSpace , the wiki thing it's part of. Unfortunately you're using a browser version that my anti-crawler precautions consider suspicious, most often because it's too old (most often this applies to versions…

127

Images over DNS

Some places say 255 bytes. They are wrong . Within a TXT record there are multiple character-strings (RFC 1035 section 3.3.14 ) and those are limited in length (because a single byte is used for their length), however there can be many of them.

133

My other email client is a daemon

I have a slight problem wherein every time I start up a game of NetHack, I completely lose touch with my surroundings for hours on end. Thankfully The DevTeam Thinks Of Everything and there’s a solution that allows communication with the outside world without breaking immersion: the mail daemon!

134

Memories of .us

How much do you remember from elementary school? I remember vinyl tile floors, the playground, the teacher sentencing me to standing in the hallway. I had a teacher who was a chess fanatic; he painted a huge chess board in the paved schoolyard and got someone to fabricate big wooden chess pieces. It was enough of an…

138

NAT Is the Enemy of Low Power Devices

If you have ever tried communicating with a device on a private network, you may have encountered Network Address Translation (NAT). Because the number of connected devices has long outpaced the number of unique addresses in the IPv4 address space, public IP addresses have to be shared between devices. This introduces…

141

PureVPN IPv6 Leak

Two findings in PureVPN on Ubuntu 24.04. After a reconnect the system takes a default IPv6 route outside the tunnel, and the ip6tables OUTPUT policy is still ACCEPT, so traffic leaves in the clear while the client reports connected.

144

Stop Breaking TLS

Rant ahead: I hate TLS “Inspection” software with a burning passion and I wish we collectively as an industry would just knock it the fuck off and stop pretending it’s some great security benefit. Every time I encounter it, in whatever form, it’s a gigantic headache that makes everyone’s life worse off and as far as I…

148

How to distrust a CA without any certificate errors

A “distrust” is when a certification authority (CA) that issues HTTPS certificates to websites is removed from a root store because it is no longer trusted to issue certificates. This means certificates issued by that CA will be treated as invalid, likely causing certificate error interstitials in any browser that…

150

Tailscale Services

Tailscale Services is a new way to define available resources on your network and expand the granularity of your access controls to resources that may not have Tailscale installed on them.