Re: [v6ops] A good example of why we need to careful about ULAs

[Jeroen Massar <[e-mail]>]

On 2013-05-30 14:45, Brian E Carpenter wrote:
[..]
>> In the early news, not really a new problem.
>>
>> RFC1918 and 100.64/10 leak too, 
> 
> In traceroutes, link-locals sometimes leak too.

I have never come across that; except maybe when tracerouting to a
link-local, and then, that would only be one hop anyway.

If you know how to replicate it, I am very interested in a packet dump
or what is involved to cause it.

> All these are confusing and make the traceroute hard to interpret,
> but they don't actually *matter*. What matters is if they leak in
> actual traffic such as attempted TCP connections. Does that happen?

One should only see a link-local when:
 - the source packet is link-local
 - the destination host only has a link-local and replies (TTL or so)

But that should never cross more than one (1) hop as link-locals should
not be forwarded.

Greets,
 Jeroen