IPv6 prefix from T-Mobile USA used but not announced in BGP (2607:7700::/32)

Ca By cb.list6 at gmail.com
Wed Apr 27 20:04:37 UTC 2016

On Wednesday, April 27, 2016, Baptiste Jonglez <baptiste at bitsofnetworks.org>

> 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


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