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240.0.0.0/4: The Future Begins Now

240.0.0.0/4: The Future Begins Now. Vince Fuller Eliot Lear David Meyer. What’s this all about?. 240.0.0.0/4. Source: IANA (20 Sep 2007). Options for 240.0.0.0/4. Make Space Unicast Public Makes it potentially available sometime down the line Make Space Unicast Private

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240.0.0.0/4: The Future Begins Now

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  1. 240.0.0.0/4: The Future Begins Now Vince Fuller Eliot Lear David Meyer

  2. What’s this all about? 240.0.0.0/4 Source: IANA (20 Sep 2007)

  3. Options for 240.0.0.0/4 • Make Space Unicast Public • Makes it potentially available sometime down the line • Make Space Unicast Private • Lets “consenting adults” use space(draft-wilson-classe-01.txt) • Split space up in some way • Do Nothing

  4. Our Approach • We don’t yet know or agree on how address space should be used, except… • Someone should use it • “future use” doesn’t make much sense any more • Make code changes NOW and figure out whether it’s public or private in the next year or so • Draft-fuller-240space-00.txt

  5. There is some running code • Coming soon to a Linux kernel near you • 5 files, removing a few lines each (submitted) • Kernel developers have done a simpler version • FreeBSD and OSX (mostly) works • One minor change if system is a router • Has been added to latest Solaris • More code needed (in many places); this will take time • If you want this, tell your vendors

  6. Possible issues • Will this slow down ipv6 implementations? • Seems unlikely given how simple this is • What about router support? • Surprisingly few “martian” checks for 240/4 • Cisco DCOS done; IOS, XR bug fixes opened • Don’t know about Juniper, others • Microsoft and 6to4 tunneling • Application knows if address is public/private • But should this prevent kernel changes?

  7. Last words • 240/4 is not a panacea but it may help • No consensus yet on public/private… • …code changes are simple • …and status can be decided later • “Let’s Do It”

  8. Questions? Comments?

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