Free Tool
nftables DDoS Protection Rule Generator
Generate modern nftables rulesets for Linux DDoS protection. nftables replaces iptables with better performance, atomic rule updates, and a cleaner syntax.
nft -c -f nftables.conf to check syntax without applying. Keep out-of-band access available. On systemd systems, rules persist via /etc/nftables.conf and systemctl enable nftables.
nftables vs iptables - Why Migrate?
| Feature | iptables | nftables |
|---|---|---|
| Atomic rule replacement | No (rule-by-rule) | Yes (entire ruleset) |
| Performance at scale | Linear matching | Optimized set lookups |
| IPv4 + IPv6 unified | Separate commands | inet family handles both |
| Named sets/maps | Requires ipset | Built-in |
| Kernel API | Legacy xtables | Modern nf_tables |
| Syntax | Flat CLI flags | Structured, readable |
| Tracing/debugging | Limited | Built-in trace support |
| Distro default (2024+) | Being deprecated | Default in most distros |
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Start your free trial →Using nftables for DDoS Protection on Linux
nftables is the modern Linux firewall framework that replaces iptables. It provides a single unified engine for IPv4, IPv6, ARP, and bridge filtering, with better performance characteristics for DDoS defense. The key advantages over iptables include atomic rule replacement (swap an entire ruleset in one operation), built-in set and map support (no need for external ipset), and optimized packet matching that uses lookup tables instead of linear rule chains.
For DDoS mitigation, nftables meters are the primary tool. A meter tracks per-source-IP counters inline, letting you rate-limit SYN packets, UDP traffic, or ICMP requests per source without maintaining separate state tables. Combined with named sets for blackhole lists and connection tracking for stateful filtering, nftables handles most on-host DDoS defense scenarios.
When nftables Is Not Enough
nftables operates at the netfilter layer after the kernel network stack has already processed the packet. For attacks exceeding 1-3 million PPS, the kernel itself becomes the bottleneck. At that point, you need XDP (eXpress Data Path) for in-kernel filtering at the driver level, or upstream mitigation via BGP FlowSpec that filters traffic before it reaches your server. Flowtriq detects when attacks exceed on-host capacity and automatically escalates to upstream mitigation.
Related reading:
Deployment Guide
Follow these steps to safely deploy your generated nftables rules on a production server.
Check for errors with nft -c -f rules.nft. The -c flag validates without applying.
Schedule an automatic rollback: at now + 5 minutes <<< "nft flush ruleset". If you get locked out, rules flush automatically.
Run nft -f rules.nft and test SSH immediately. Cancel the safety timeout once confirmed.
Save with cp rules.nft /etc/nftables.conf && systemctl enable nftables. On Debian/Ubuntu, the nftables service loads /etc/nftables.conf at boot automatically.
Run nft list ruleset to see active rules and packet/byte counters confirming traffic is hitting your rules.
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