Should I Block ICMP?

Re:Should I Block ICMP? by redrove on Tuesday January 10, 2023 @04:22AM (#34322319)

I find that a little hard to remember, and nmap isn't as widely available as netcat:

  nc -zv 1.1.1.1 443

Alternatively, the most barebones version, useful for inside a container where all you have is a shell and the kernel:

  cat > /dev/tcp/www.google.com/443

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Re:Should I Block ICMP? by tredre3 on Wednesday January 11, 2023 @08:43AM (#34338302)

> Alternatively, the most barebones version, useful for inside a container where all you have is a shell and the kernel:

> cat > /dev/tcp/www.google.com/443

I was unfamiliar with this device so I googled a bit. This isn't a real file/device, it's a bash-ism when built with --enable-net-redirections (apparently disabled in debian-based distros [1]).

That's too bad, would have been cool to have such easy access to sockets anywhere using fopen().

1. https://www.oreilly.com/library/view/bash-cookbook/059652678...

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