> Ugliness is in the eye of the beholder. Personally, I think this > solution is clever and elegant. Also, this was a trivial code change > to make work in GUE.
Agree. > -----Original Message----- > From: Int-area [mailto:int-area-boun...@ietf.org] On Behalf Of Tom Herbert > Sent: Friday, June 17, 2016 8:36 AM > To: Xuxiaohu <xuxia...@huawei.com> > Cc: n...@ietf.org; int-area@ietf.org > Subject: Re: [Int-area] [nvo3] Fwd: New Version Notification for > draft-ietf-nvo3-gue-03.txt > > On Thu, Jun 16, 2016 at 6:48 PM, Xuxiaohu <xuxia...@huawei.com> wrote: > > > > > >> -----Original Message----- > >> From: Tom Herbert [mailto:t...@herbertland.com] > >> Sent: Thursday, June 16, 2016 10:37 PM > >> To: Xuxiaohu > >> Cc: int-area@ietf.org; n...@ietf.org > >> Subject: Re: [nvo3] [Int-area] Fwd: New Version Notification for > >> draft-ietf-nvo3-gue-03.txt > >> > >> On Thu, Jun 16, 2016 at 2:12 AM, Xuxiaohu <xuxia...@huawei.com> wrote: > >> > > >> > > >> >> -----Original Message----- > >> >> From: Int-area [mailto:int-area-boun...@ietf.org] On Behalf Of Tom > >> >> Herbert > >> >> Sent: Saturday, June 11, 2016 1:21 AM > >> >> To: int-area@ietf.org; n...@ietf.org > >> >> Subject: [Int-area] Fwd: New Version Notification for > >> >> draft-ietf-nvo3-gue-03.txt > >> >> > >> >> Hello, > >> >> > >> >> We've posted a new version of GUE. The primary addition is that we > >> >> added GUE version 1 that allows direct encapsulation of IPv4 and IPv6 > >> >> over UDP (port 6080). This effectively implements > >> >> draft-xu-intarea-ip-in-udp-03 also. > >> > Tom, > >> > > >> > What's the real benefit of such implementation of IP-in-UDP compared to > >> > the > >> approach as described draft-xu-intarea-ip-in-udp-03? Save one UDP port > >> number? > >> > > >> Yes, saves a port number. > > > > To save a port number, the header format is made ugly. Is it worthwhile? If > > UDP port resource was so sparse as you had imagined, I > think the UDP port resource keeper would not allocate two different port > numbers for VXLAN and VXLAN-GPE since the P-bit in > VXLAN-GPE header is enough to distinguish VXLAN-GPE from VXLAN. For more > details, please look at section 3.2 of > (https://tools.ietf.org/html/draft-ietf-nvo3-vxlan-gpe-02#page-6). > > > Xiaohu, > > Ugliness is in the eye of the beholder. Personally, I think this > solution is clever and elegant. Also, this was a trivial code change > to make work in GUE. > > As for the UDP port number space, I suggest you review RFC6335. From that: > > "Conservation of the port number space is required because this space > is a limited resource, so applications are expected to participate in > the traffic demultiplexing process where feasible. The port numbers > are expected to encode as little information as possible that will > still enable an application to perform further demultiplexing by > itself." > > To flip the question around, what would be the value be for allocating > new port numbers to do IP-over-UDP if this can already be done with an > existing port number? The fact that this same port number can be also > used for GUE isn't particularly relevant (i.e. the Swiss Army Knife > point), an implementation is perfectly free to only send IP-in-UDP on > the port and never has to send a single GUE packet (vers. 0). > Semantically and operationally there is no difference between port > 6080 or using a new port for IP-in-UDP. > > Tom > > >> > > >> >> Thanks, > >> >> Tom > >> >> > >> >> ---------- Forwarded message ---------- > >> >> From: <internet-dra...@ietf.org> > >> >> Date: Fri, Jun 10, 2016 at 10:14 AM > >> >> Subject: New Version Notification for draft-ietf-nvo3-gue-03.txt > >> >> To: Tom Herbert <t...@herbertland.com>, Lucy Yong > >> >> <lucy.y...@huawei.com>, Osama Zia <osa...@microsoft.com> > >> >> > >> >> > >> >> > >> >> A new version of I-D, draft-ietf-nvo3-gue-03.txt has been > >> >> successfully submitted by Tom Herbert and posted to the IETF repository. > >> >> > >> >> Name: draft-ietf-nvo3-gue > >> >> Revision: 03 > >> >> Title: Generic UDP Encapsulation > >> >> Document date: 2016-06-10 > >> >> Group: nvo3 > >> >> Pages: 28 > >> >> URL: > >> >> https://www.ietf.org/internet-drafts/draft-ietf-nvo3-gue-03.txt > >> >> Status: https://datatracker.ietf.org/doc/draft-ietf-nvo3-gue/ > >> >> Htmlized: https://tools.ietf.org/html/draft-ietf-nvo3-gue-03 > >> >> Diff: https://www.ietf.org/rfcdiff?url2=draft-ietf-nvo3-gue-03 > >> >> > >> >> Abstract: > >> >> This specification describes Generic UDP Encapsulation (GUE), which > >> >> is a scheme for using UDP to encapsulate packets of arbitrary IP > >> >> protocols for transport across layer 3 networks. By encapsulating > >> >> packets in UDP, specialized capabilities in networking hardware for > >> >> efficient handling of UDP packets can be leveraged. GUE specifies > >> >> basic encapsulation methods upon which higher level constructs, such > >> >> tunnels and overlay networks for network virtualization, can be > >> >> constructed. GUE is extensible by allowing optional data fields as > >> >> part of the encapsulation, and is generic in that it can encapsulate > >> >> packets of various IP protocols. > >> >> > >> >> > >> >> > >> >> > >> >> Please note that it may take a couple of minutes from the time of > >> >> submission until the htmlized version and diff are available at > >> >> tools.ietf.org. > >> >> > >> >> The IETF Secretariat > >> >> > >> >> _______________________________________________ > >> >> Int-area mailing list > >> >> Int-area@ietf.org > >> >> https://www.ietf.org/mailman/listinfo/int-area > >> > > >> > _______________________________________________ > >> > nvo3 mailing list > >> > n...@ietf.org > >> > https://www.ietf.org/mailman/listinfo/nvo3 > > _______________________________________________ > Int-area mailing list > Int-area@ietf.org > https://www.ietf.org/mailman/listinfo/int-area _______________________________________________ Int-area mailing list Int-area@ietf.org https://www.ietf.org/mailman/listinfo/int-area
