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doc: firewall: add nftables tips

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Solène Rapenne 2023-11-03 14:50:42 +01:00
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user/security-in-qubes/firewall.md
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@ -430,3 +430,24 @@ tcpdump -i eth0 -nn dst port 22 and src net 192.168.x.y/24
```
This can be used effectively in a destination qube and its Network VM to see if forwarding / NAT rules are working.
Nftables tips
-------------
A simple way to experiment changes with your ruleset can be achieved by saving the current working ruleset in two files, one for backup and the other for making changes.
By adding `flush ruleset` at the top of the file, you can achieve atomic update, which mean the new ruleset would replace the current one only if it fully succeed to load.
You can dump the ruleset in two files using the following command:
```
nft list ruleset | tee nft_backup | tee nft_new_ruleset
```
Then, edit `nft_new_ruleset`, add `flush ruleset` on top and make changes, load it with `nft -f nft_new_ruleset`.
You can revert to the original ruleset with the following commands:
```
nft flush ruleset && nft -f nft_backup
```