icmp rpf

Patrick W. Gilmore patrick at ianai.net
Tue Sep 26 17:41:52 UTC 2006

On Sep 26, 2006, at 11:57 AM, Mark Kent wrote:

> I asked:
>> Who among AS1239, AS701, AS3356, AS7018, AS209 does loose RPF
>> (not just strict RPF on single-homed customers)?
> and Patrick answered:
>>> I'm wondering why that is relevant.
> It's relevant because it was suggested that loose RPF should be a
> "best common practice" so I was curious which of those ASes decided
> that the benefits outweighed the negatives and actually do it.
> Don't worry, those were randomly chosen AS.  I didn't intend to
> make any suggestion that the answer would be more important to me
> for that set of ASes than any other.

The actual practices of a network are not necessarily a way to look  
at what best common practices should be.

For instance, how many networks are in full compliance with BCP38?

Or are you arguing that since essentially no one is compliant, we  
should scrap the BCP?

> But, you were correct that I wasn't asking the question
> I really wanted answered.   What I wanted to know was, among the
> attentive nanog membership, which of you think and/or know that
> any/all of those AS do loose RPF?
> The motivation here is that, if asked last week, I would have guessed
> that none of them run loose RPF.  But at least one of them does.
> The two answers, how many actually do plus whether everyone knew it,
> will help me decide if I need to spend more time reading nanog email
> and nanog proceedings (or actually go to a meeting), or not...

Good question.

<waits for answers>


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