OpenWRT is a Linux distribution for wireless routers and low-resource embedded devices. It provides a coherent base system for different plattforms, various hardware and firmware drivers, and a Debian-style packaging system for application and add-on packages. The JSON-RPC based admin web interface LuCI makes configuration very user-friendly, but keeps the similar SSH and command line UCI interface and /etc files accessible. With its own PROCD system event daemon it can immediately respond to up
Upnpry is an upnp port opener for linux. It intercepts upnp port opening requests to routers and opens the corresponding ports on the linux box.
Dante is a free implementation of the proxy protocols SOCKS version 4 and SOCKS version 5 (RFC 1928) that supports both IPv4 and IPv6. It can be used as a firewall between networks and to control outgoing or incoming traffic. The package consists of two parts: a SOCKS server and a proxy client that supports SOCKS, HTTP proxies, and UPnP. RFC 1961 (GSSAPI) is supported in both the client and the server. Commercial support is available.
SSHGuard is an automated log watcher which quickly sets up firewall blocks for detected brute-force attacks. It supports not just SSH, but also sendmail, exim, dovecot, Cucipop, UWimap, vsftpd, proftpd, pure-ftpd and FreeBSD ftpd. It understands syslog/-ng, metalog, multilog and raw log formats. And works with netfilter/iptables, PF, ipfw, or just hosts.allow to set up firewalling rules.
DenyHost works to automatically block brute-force attacks against the secure shell service. It does this by scanning log files for failed login attempts and blocking remote hosts which have made too many failed connections.
A Netfilter firewall tool written in bash scripting, designed to be easy to use but yet flexible and powerful.
Sphirewall is a user-centric, application layer, analytical network firewall/router. Out-of-the box, it provides user authentication coupled with powerful analytics which provide you with complete control over your network and users. With Sphirewall, you can manage and understand what is happening on your network with features such as qos, bandwidth quotas, user authentication, application layer filtering and much more. Not built on iptables, it is able to do things which other Open Source fi
Webfwlog is a Web-based firewall log reporting and analysis tool. It allows users to design reports to use on logged firewall data in whatever configuration they desire. Included are sample reports as a starting point. Reports can be sorted with a single click, or "drilled-down" all the way to the packet level, and saved for later use. Supported log formats are netfilter, ipfilter, ipfw, ipchains, Cisco routers, Snort, and Windows XP. Netfilter support includes ulogd MySQL or PostgreSQL database
ArpON is a daemon that handles and inspects ARP (address resolution protcol) requests and thusly can prevent MITM attacks, ARP sppofing, cache or route poisoning. It also blocks related network attacks like ARP sniffing, hijacking, or injection, or higher-level DNS and HTTP request/session spoofing, or SSL/TLS circumvention. It also protects networks with proactive (network interface or system shutdown) and dynamic ARP traffic inspections in complexer setups.
Shorewall is a flexible firewall configuration system for Linux 2.4/3.x iptables. It's suitable for routers, gateways, servers, VPN environments and just desktop systems. It provides a higher level rule-based configuration scheme to configure the Netfilter kernel module, routes, interfaces and traffic shaping. It supports both IPv4 and IPv6.