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

[Jeroen Massar]

On 2013-05-29 13:56, Brian E Carpenter wrote:
> Isn't it possible for a ULA to show up in a traceroute because it's
> used on an internal interface by a transit network?

Possible: yes, bad idea: definitely

When uRPF is enabled or other source verification checks are being done,
one will never have a valid path to that address and thus one cannot
source packets, even ICMP, from that address.

> Your packets
> may not even have crossed that interface of the router concerned.
> 
> There's also a loop between hops 6 and 7, isn't there?

That looks more like multiple hops through the same box, which likely
indicates other issues with that setup.

Greets,
 Jeroen