I just went hunting for an instance of this in IETF land, and only found references related to two hosts talking to one another from behind the same NAT. So, I went hunting on the internet, and everywhere I saw an explanation, it was of the variant "going out the same interface it came in on" and used U-turn synonymously. I was unable to find a reference to a definition as I outlined below. That's not necessarily an issue but we may need to explain the term before we use it so that there is no confusion.
Thanks, Wes On 10/31/15, 10:07 PM, "Sriram, Kotikalapudi" <[email protected]> wrote: >Wes, > >Thanks, Wes, for taking another look. >And thanks for laying out some interesting (and entertaining) alternative >names >that can to used instead of "U-Turn". >Like we discussed in the hallway this morning, it makes sense to use >"Hairpin Turn" >instead of "U-Turn", especially considering "Hairpin Turn" has been used >in the VPN context. > >Sriram > > >________________________________________ >From: George, Wes <[email protected]> >Sent: Friday, October 30, 2015 10:01 AM >To: Sriram, Kotikalapudi >Cc: [email protected]; [email protected] [email protected]; >[email protected] >Subject: Re: [GROW] WGLC: draft-ietf-grow-route-leak-problem-definition >(ends: 8/24/2015 - Aug 24) > >On 10/12/15, 11:40 PM, "Sriram, Kotikalapudi" ><[email protected]> wrote: > > >Sriram, this is significantly improved. One substantial comment that I >still have with this version: > >>>It is also unclear from the text exactly what you mean by U-Turn >>>(it's not going back the way it came, so actually hairpin might be a >>>better term), >>>so a few words to clarify might be useful. >> >>Hairpin seems to have a connotation that the turn is tight/constricted. >>So now I use the phrase “U-shaped turn” instead of “U-turn”. > >WG] This may be nitpicking, but I don't think that adding "shaped" is >actually much of an improvement. I was thinking of hairpin from the way >that it is used in VPNs, as in data that enters and leaves the network via >the same edge device, but typically on a different physical or logical >interface (instead of entering on one PE and leaving via another), rather >than the way that it is used on racetracks to describe a near 180 degree >turn. >Here are a few ideas I had of other ways to refer to this: > >- a "detour leak", in that traffic will be detouring through the leaking >ASN >- "ASN-in-the-middle leak" - similar to MiTM such that invoking the >concept is useful, but it's necessary to disambiguate the two since the >latter has a specific and well-known meaning >- "parrotting leak" or "game of telephone leak" in that it is repeating >something it learned elsewhere, but introducing a mistake, not unlike the >grade school game of telephone (if you're up for a reference to The >Simpsons, you could call it a "purple monkey dishwasher leak" but that >would likely require too much explanation ;-) ) >- "[accidental | unintentional] transit leak" since the net result of the >leak is that traffic will transit the leaking AS rather than its normal >path > > >Thanks, > >Wes > > >Anything below this line has been added by my company’s mail server, I >have no control over it. >----------- > > >________________________________ > >This E-mail and any of its attachments may contain Time Warner Cable >proprietary information, which is privileged, confidential, or subject to >copyright belonging to Time Warner Cable. This E-mail is intended solely >for the use of the individual or entity to which it is addressed. If you >are not the intended recipient of this E-mail, you are hereby notified >that any dissemination, distribution, copying, or action taken in >relation to the contents of and attachments to this E-mail is strictly >prohibited and may be unlawful. If you have received this E-mail in >error, please notify the sender immediately and permanently delete the >original and any copy of this E-mail and any printout. ________________________________ This E-mail and any of its attachments may contain Time Warner Cable proprietary information, which is privileged, confidential, or subject to copyright belonging to Time Warner Cable. This E-mail is intended solely for the use of the individual or entity to which it is addressed. If you are not the intended recipient of this E-mail, you are hereby notified that any dissemination, distribution, copying, or action taken in relation to the contents of and attachments to this E-mail is strictly prohibited and may be unlawful. If you have received this E-mail in error, please notify the sender immediately and permanently delete the original and any copy of this E-mail and any printout. _______________________________________________ GROW mailing list [email protected] https://www.ietf.org/mailman/listinfo/grow
