ip6tables-save: snapshot IPv6 firewall rules

Quick capture and restore example

Run the save command as root, redirect into a file, inspect it, then restore to verify: ```# ip6tables-save > /etc/iptables/rules.v6 # cat /etc/iptables/rules.v6 *filter :INPUT DROP [0:0] :FORWARD DROP [0:0] :OUTPUT ACCEPT [0:0] -A INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT -A INPUT -p icmpv6 -j ACCEPT COMMIT # ip6tables-restore < /etc/iptables/rules.v6 # ip6tables-save *filter :INPUT DROP [0:0] :FORWARD DROP [0:0] :OUTPUT ACCEPT [0:0] -A INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT -A INPUT -p icmpv6 -j ACCEPT COMMIT ```

Counters, privileges and safe storage

Include packet and byte counters with `ip6tables-save -c` when you want live statistics preserved; remember the command needs root privileges, so write backups into a safe, versioned path such as `/etc/iptables/rules.v6` and protect that file from accidental edits.

Automation and system integration

Use `ip6tables-save` in scripts to snapshot rules before automated changes, hook it into configuration management or into Debian's iptables-persistent/netfilter-persistent flow, and restore with `ip6tables-restore` during boot or after bulk updates to guarantee deterministic firewall state.

When to prefer newer tools

`ip6tables-save` is excellent for current ip6tables deployments but consider migrating to `nftables` for unified IPv4/IPv6 handling; until migration, combine `ip6tables-save` with careful testing when you manage mixed environments.

Practice by creating small rule sets, saving them, and restoring in a VM; hands-on repetition reveals quirks like ordering sensitivity and the importance of counters for troubleshooting, so test restores before deploying changes to production.