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n/firewalld.md: add ipv6-icmp protocol

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Aminda Suomalainen 2024-04-17 11:34:08 +03:00
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@ -20,6 +20,7 @@ The blog post also predates me having a /n directory here.
<!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->
- [Zones](#zones)
- [Protocols](#protocols)
- [Services](#services)
- [Ports](#ports)
@ -37,6 +38,15 @@ zones.
Zone would be specified by `--zone=home` in the commands. The other zone I
could imagine using is `public`.
## Protocols
```bash
sudo firewall-cmd --add-protocol=ipv6-icmp --permanent
```
- Tells computers when things go wrong with IPv6 network. See also [Neil Alexander: Understanding ICMP and why you shouldn't just block it outright](https://neilalexander.dev/2017/04/16/understanding-icmp).
- _Motivation for being here is [20/20 in IPv6-test.com](https://ipv6-test.com)._
## Services
```bash