IPv6 Lo. for 6PE/6VPE

Fri Jun 15 20:03:56 UTC 2012

Yes... That shouldn't happen.

Whoever is responsible for the routers at 154.54.{57.102,30.129,5.253} should fix their configurations.

Owen

On Jun 15, 2012, at 6:07 AM, Robert McKay wrote:

> You mean like this? ;)
> 
> 1. ???
> 2. ldn-ipv6-b1.ipv6.telia.net                                           0.0%     3    1.0   1.2   1.0   1.4   0.2
> 3. cogent-ic-125507-ldn-b5.c.telia.net                                  0.0%     2   40.6  40.4  40.2  40.6   0.3
> 4. ::ffff:154.54.57.102                                                 0.0%     2  129.1 129.1 129.1 129.1   0.0
> 5. ::ffff:154.54.30.129                                                 0.0%     2  120.2 120.0 119.8 120.2   0.3
> 6. 2001:550::100                                                        0.0%     2  120.2 120.3 120.2 120.5   0.2
> 7. ::ffff:154.54.5.253                                                  0.0%     2  120.5 120.3 120.1 120.5   0.3
> 8. ???
> 9. cogentco.com                                                         0.0%     2  119.9 119.9 119.9 119.9   0.0
> 
> Rob
> 
> On Fri, 15 Jun 2012 04:35:51 -0700, Owen DeLong wrote:
>> If it does, that's bad... You should never see IPv4 mapped addresses
>> on the wire.
>> They should only be an internal representation of an IPv4 packet
>> within the host.
>> 
>> Owen
>> 
>> On Jun 15, 2012, at 3:52 AM, Nagendra Kumar (naikumar) wrote:
>> 
>>> Hi,
>>> 
>>> Per my understanding, it is not required to have ipv6 address in loopback intf on all P routers inorder to have 6PE work. If I remember it correctly, P router will use ::FFFF::<ipv4-addr> while originating ICMPv6 error message.
>>> 
>>> -Nagendra
>>> 
>>> -----Original Message-----
>>> From: Daniel Roesen [mailto:dr at cluenet.de]
>>> Sent: Friday, June 15, 2012 4:02 PM
>>> To: nanog at nanog.org
>>> Subject: Re: IPv6 Lo. for 6PE/6VPE
>>> 
>>> On Fri, Jun 15, 2012 at 11:56:05AM +0200, mohamed Osama Saad Abo sree wrote:
>>>> I was just wondering , while I'm planning my network to support
>>>> 6PE/6VPE why should i assign an IPv6 for Loopbacks?
>>>> 
>>>> Maybe it's needed for Point-Point links or external interfaces between
>>>> my peers, but anyone here know why i should assign IPv6 for all my
>>>> Routers inside my ISP if we will run PE/6VPE not dual stack.
>>> 
>>> Otherwise the intermediate P devices do not have an address to source
>>> ICMPv6 "hop count exceeded" error replies => traceroute doesn't work properly.
>>> 
>>> Best regards,
>>> Daniel
>>> 
>>> --
>>> CLUE-RIPE -- Jabber: dr at cluenet.de -- dr at IRCnet -- PGP: 0xA85C8AA0
>>> 
> 