IPFW review
FreeBSD's free, deeply configurable firewall for administrators comfortable with command-line rules.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
IPFW is a free, open-source firewall included with FreeBSD. It is designed for administrators managing FreeBSD servers, gateways, appliances, and embedded systems through the command-line ipfw utility. Its core function is ordered packet filtering for IPv4 and IPv6, with rules that can allow, deny, count, log, redirect, or otherwise process traffic. Inbound and outbound matching, stateful rules, and user, group, or jail-based matching give it a strong fit for low-level network control on FreeBSD.
Its feature depth extends beyond basic filtering. IPFW supports network address translation, packet logging through syslog, ipfw0, or routing sockets, lookup tables, and rule sets. Traffic shaping and packet scheduling are handled through dummynet, while forwarding and bridging support broaden its role across gateways and network appliances. Administrators can build ordered rules for both directions of traffic and use stateful behavior to track connections. This makes IPFW suited to environments where precise policy control matters more than a graphical workflow or a broad software ecosystem.
The main trade-off is scope and operating model. IPFW is a FreeBSD system component rather than a separately hosted commercial product, and its platform focus keeps it closely tied to FreeBSD deployments. Command-line administration also favors network operators who are comfortable designing, ordering, logging, and maintaining firewall rules directly. Choose IPFW when FreeBSD compatibility, open-source access, stateful filtering, NAT, shaping, and detailed matching are priorities. Choose an alternative when you need cross-platform coverage, verified integrations, or centralized management across multiple firewall platforms.
IPFW pros and cons
- Where it wins
- Stateful IPv4 and IPv6 filtering with inbound and outbound rules
- NAT, logging, traffic shaping, lookup tables, and rule sets
- Matches traffic by user, group, or jail as well as network conditions
- Where it doesn't
- Limited to FreeBSD systems
- Operated through the command-line ipfw utility
- No verified integrations or central management layer
IPFW fact sheet, pricing and score →
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