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rad-unnumbered

what is rad-unnumbered

rad-unnumbered is a very light weight ipv6 RA server that dynamically detects and handles l3 unnumbered tap interfaces on a hypervisor for ipv6 forwarding

how does it work

  • it finds tap interfaces dynamically through netlink push msg as they are created/destroyed
  • it matches tap interface name by regex, to handle only matching interfaces (tap.*_0), can be configured through command line
  • if tap matches regex AND has at least one route pointing to it, it will send RAs advertising a default route on that interface
  • if tap matches regex AND also has a host route (aka /128) pointing there, it will pick the first host route in the list and advertise that as a /64 prefix so clients can auto configure themselfs with a slaac IP.

NOTE:

  • rad-unnumbered assumes the host route found is actually matching the SLAAC ip for the VMs assigned mac address - but rad-unnumbered has no knowledge of this mac to verify

usage:

./rad-unnumbered --help