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IOS2JunOS
Posts: 92
Registered: ‎10-17-2008
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Anyone using /127 IPV6 address on P2P links?

just wondering and if it's supported on different platforms..any issues? rfc6164 says it OK to use..not sure if anyone actually using it..TIA

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ddivins
Posts: 4
Registered: ‎04-01-2011
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Re: Anyone using /127 IPV6 address on P2P links?

I have used it on J and MX without issue.  I think a /112 is a nice compromise as you can still use the ::1 and ::2

 

Best,

dsd

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IOS2JunOS
Posts: 92
Registered: ‎10-17-2008
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Re: Anyone using /127 IPV6 address on P2P links?

[ Edited ]

our ISP assigned us a /126 for our p2p link with them..and other one gave us /64 for their p2p..at this point.there doesn't seem to be a consensus on what should be used..

/126 is eqivlent of /30..any thoughts about that?

can be use .1 and .2 and .5  and .6 and so on...

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SapphireNET
Posts: 154
Registered: ‎03-27-2008
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Re: Anyone using /127 IPV6 address on P2P links?

I believe there was a presentation at one of the NANOG sessions regarding this.

 

They stated that best to allocate a /64 to each link but at the moment to actually use a /127 on that prefix for the link.

the reason was because of possible security issues at the moment.

 

http://www.nanog.org/meetings/nanog48/presentations/Tuesday/Bonica_LinkNumb_N48.pdf

JNCIS-M, JNCIS-SEC
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stine
Posts: 434
Registered: ‎05-05-2008
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Re: Anyone using /127 IPV6 address on P2P links?

Why should each link have a /64? If there can only ever be two endpoints, why would more than two addresses ever be required (or used)? If I've missed something fundamental, I apologize.
Theodore E Van Iderstine
Stream Networks
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JNPRdhanks
Posts: 301
Registered: ‎11-01-2010
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Re: Anyone using /127 IPV6 address on P2P links?

Miya Kohno and Becca Nitzan from Juniper Networks just recently authored RFC 6164 "Using 127-Bit IPv6 Prefixes on Inter-Router Links"

 

http://tools.ietf.org/html/rfc6164

Doug Hanks
JNCIE-ENT #213, JNCIE-SP #875

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Trusted Contributor
stine
Posts: 434
Registered: ‎05-05-2008
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Re: Anyone using /127 IPV6 address on P2P links?

Thanks.   The phrase 'broadside of a barn' comes to mind every time I read an IPv6 archtecture document, for better or worse.

Theodore E Van Iderstine
Stream Networks
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JNCIA-ER (expired), JNCIA-SSL (ditto)
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spuluka
Posts: 2,517
Registered: ‎03-30-2009
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Re: Anyone using /127 IPV6 address on P2P links?

I agree.  This seems to be a case of those who do not know history are condemned to repeat it.

 

In the early days of ipv4 large address spaces were passed out like free candy to big companies.  Many of these are still not in use on the internet.  Others were successfully reclaimed and redeployed by an arduous process.  But the feeling at the time was that the address space was so large it would not matter.

 

So here we are again with an enormous address space and again the authorities feel like it is perfectly acceptable to pass out huge swaths of addresses because the space is enormous.

Steve Puluka BSEET
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