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GNU Zebra - http://www.zebra.org/
Manages TCP/IP based routing protocols. It supports BGP4 (RFC1771), RIPv1, RIPv2 and OSPFv2. Zebra makes use of OS threads where available. |
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CIPE - http://sites.inka.de/sites/bigred/devel/cipe.html
An ongoing project to build encrypting IP routers. Software is already available for Linux and released under GPL. |
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Unofficial GNU Zebra FAQ - http://pilot.org.ua/zebra
GNU Zebra documentation, not included into releases, but useful and up-to-date. General dynamic routing information included. |
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NextHop - http://www.nexthop.com/
Makers of GateD, routing software that runs on a PC |