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>

<blockquote>ARIN is a nonprofit, member-based organization that administers IP addresses & ASNs in support of the operation and growth of the Internet.</blockquote>