It generates a random subdomain and tracks the IP from whoever tries to look up the domain name record.

An extensive introduction to IPv6 concepts.

IPv6 has always baffled me on how it works. There are too many unfamiliar terms and mechanisms such that I never felt confident enough to start using IPv6. This article solves much of my confusion.

Tool to generate tcpdump match pattern to match the beginning of TCP payloads.

Check if your IP has been blacklisted by various providers.

Covers a lot of content about DNS lookup, including these:

nsswitch
/etc/hosts
/etc/resolv.conf
ping vs host style lookups
systemd and its networking service
ifup and ifdown
dhclient
resolvconf
NetworkManager
dnsmasq

Documentation on various usages of VXLAN.

Kernel documentation on VXLAN, very concise.

A gamut of linux interfaces with nice and brief explanations.

A tool for generating RFC-like protocol header diagrams.

aggregated links for home networking devices and guides

Check if your IP is exposing any ports. If you see 404 page, nothing is exposed

<blockquote>Overview Readers will learn how to configure certain EdgeRouter models as a VLAN-Aware switch. ...</blockquote>

<blockquote>Switch 2 receives the frame on tagged port 1. This switch</blockquote>

<blockquote>Measure latency to Google Compute Engine regions</blockquote>

chn cidr

<blockquote>享网络的形式上网的，建议把</blockquote>