[188965] in North American Network Operators' Group
Re: IPv6 prefix from T-Mobile USA used but not announced in BGP
daemon@ATHENA.MIT.EDU (Ca By)
Wed Apr 27 16:04:41 2016
X-Original-To: nanog@nanog.org
In-Reply-To: <20160427193420.GA27020@lud.polynome.dn42>
Date: Wed, 27 Apr 2016 13:04:37 -0700
From: Ca By <cb.list6@gmail.com>
To: Baptiste Jonglez <baptiste@bitsofnetworks.org>
Cc: "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces@nanog.org
On Wednesday, April 27, 2016, Baptiste Jonglez <baptiste@bitsofnetworks.org>
wrote:
> Hi,
>
> While doing statistics on the participants of a public DHT, I was
> surprised to see some IP addresses that are not present in the DFZ:
>
> 2607:7700:0:25::4e00:605b
> 2607:7700:0:25::4e25:8ce8
> 2607:7700:0:25::c808:db2c
> 2607:7700:0:4::3294:6683
> 2607:7700:0:4::4c09:4d39
> 2607:7700:0:4::5985:87d1
> 2607:7700:0:4::5d7d:3df8
>
> All those IP are in 2607:7700::/32, allocated to T-Mobile USA but never
> announced:
>
> https://stat.ripe.net/2607%3A7700%3A%3A%2F32#tabId=at-a-glance
>
> What could explain their usage in an application? Some form of address
> translation? Maybe these addresses have been used as source address in
> outgoing packets, which would indicate IPv6 tests in T-Mobile? (but
> obviously, nobody is able to answer such packets).
>
> Baptiste
>
You see these addresses because your DHT is not supporting IP correctly.
Enable ipv6 and your flaw will be resolved and you will no longer see these
addresses.
CB
