IPNetRouter is software-based IP router written by Peter Sichel, the author of IPNetMonitor and many other superb Mac OS networking products. IPNetRouter features support of unlimited clients, NAT, DHCP Server, DNS forwarding, Port Mapping, Filtering, and a whole lot more. Although no information is available regarding what's new in version 1.6.9 - the latest release for "Classic" Mac OS - version 1.6.8 added/changed the following:
See the IPNetRouter release notes for more specific information.
On top of the features of the "Classic" version, the Mac OS X version (known as "IPNetRouterX") adds IP masquerading (Network Address and Port Translation with inbound port mapping) a DHCP Server, and AirPort configuration to the IPNetSentryX firewall foundation. As such, it provides in kernel single address space AVL search trees for best in class NAT performance with the maturity of a next generation design based on IPNetRouter classic.
Apart from being made as a Universal Binary for native performance on Intel- and PowerPC-based Macs, version 1.3 of IPNetRouterX added a number of significant new features and fixes that are detailed in the online release notes.
Version 1.4 specifically adds/changes the following:
"IPNetRouter is excellent! Best $50 I've ever spent on shareware. I've been using it for a month to provide Internet access to my LAN of several Macs and PCs via a single IP address and my @Home cable modem. Very stable, great performance and amazingly, doesn't load down the gateway Mac at all. Peter also runs a nice NetTalk mailing list so users can share experiences and support each other."
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Also, if you have an older Mac, be sure to check out the "Classic" applications page for more options.
Finally, take a look at ALEMIA if you think you know that name of an application, but aren't quite sure.
For an interesting and objective third-party view of Apple's networking technology - from MacTCP through Open Transport and beywond - Peter Sichel's Sustainable Softworks page is unparalleled.
These are applications that are newer and of potential interest, but which I haven't yet selected for permanent inclusion. Have a look, and let me know if you think they deserve to be part of the permanent collection!