Usage of fd00::/8 on the Interwebz - something with filters and uRPF

Tore Anderson tore at fud.no
Thu May 30 08:49:07 CEST 2013


* Jeroen Massar

> Hmmmm fd00::/8, that really should never ever be visible on the
> Internet, being Unique *LOCAL* Addresses.

FWIW this is not unique to ULAs. When tracerouting through AS174, for
example, you'll see IPv4-mapped IPv6 addresses, courtesy of 6PE. At
least that was the case a couple of years back.

That said, if you go looking, I'll wager you'll find RFC1918 addresses
IPv4 traceroutes too.

Tore


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