Re: [Softwires] draft-ietf-softwire-lw4over6 excluding Well Known Ports
Cong Liu <gnocuil@gmail.com> Tue, 03 June 2014 10:24 UTC
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References: <53422B8F.2020109@ericsson.com> <37A243DD-5249-4070-AB19-6DFFCFE17AA7@gmx.com> <DC98AF70-DBF1-48AD-8699-2FC4E645FF40@cisco.com> <C3B32B71-79EE-408F-A92C-D40021DC9A5A@gmx.com> <92E51E75-2914-421F-B222-7478EC3D6A02@cisco.com> <BBFBDEAA-0D2B-4A74-86E4-88824712EA26@gmx.com> <CAFFjW4igsiqS5yNUECerMzpZSkmPaL28sqef1usZdxt87y1jEw@mail.gmail.com> <538CB982.2060502@gmail.com> <CAFFjW4jxY=fjCszomzHyWhYtb+1QE+bN-afp_Qi5_32WxUydJg@mail.gmail.com> <538CD547.8070108@gmail.com> <CAFFjW4hqGQ0-oxTcgtFeWgbZRBj5d+82YWJT5Dfh763PORZCYw@mail.gmail.com> <CEE0FE7C-9204-494D-8229-E055E57FAF85@cisco.com> <CAFFjW4gE2byQ7YYZMQfZ3YksmjF2pGYYMp6=A+G1HhY8WHmqTg@mail.gmail.com> <D1054450-6A7E-4EF8-A3D2-D535C60E70DA@cisco.com> <CAFFjW4jAFMe3Zc4FcfXB8CHdHMzns71dP86hRJ7jPiqT738+eg@mail.gmail.com>
From: Cong Liu <gnocuil@gmail.com>
Date: Tue, 03 Jun 2014 18:23:48 +0800
Message-ID: <CAF+sHxHSOHXrrPQDYp7PzNkEDQG_yfE5gmLsRXZPYNX8gxbSGw@mail.gmail.com>
To: Wojciech Dec <wdec.ietf@gmail.com>
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Cc: draft-ietf-softwire-lw4over6@tools.ietf.org, Ole Troan <ot@cisco.com>, Yong Cui <cuiyong@tsinghua.edu.cn>, Softwires WG <softwires@ietf.org>
Subject: Re: [Softwires] draft-ietf-softwire-lw4over6 excluding Well Known Ports
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Hi Woj, Assume a=0 and PSID-len=5, then the ports are divided into [0,2047], [2048,4095], ... Just drop the first piece, and allocate others to clients. That's how a=0 works. a=6 can also work, but I don't think it's a SHOULD for a=6 to solve the WKP issue. Best Regards, Cong 2014-06-03 18:01 GMT+08:00 Wojciech Dec <wdec.ietf@gmail.com>: > Thanks. I'm not sure I get your example though. To exclude ports 0-1023, > the excluded port "subnet" would be 0x0000/6. Which would be equivalent to > a=6... > > > > > > On 3 June 2014 11:31, Ole Troan <ot@cisco.com> wrote: > >> Wojciech, >> >> > Could you show a working example of that in action, along with the set >> of PSIDs containing the usable port ranges? >> >> in LW46, ports are provisioned per client. so, I don't understand what >> you want a working example of. that's just like assigning 192.168.0.10 - >> 192.168.0.255 in a DHCP pool. in the PSID case you will not assign ports >> 0000/10 >> >> cheers, >> Ole >> >> >> > >> > Cheers >> > >> > >> > >> > >> > On 3 June 2014 10:51, Ole Troan <ot@cisco.com> wrote: >> > Woj, >> > >> > in the LW46 case, you can still do a=0, and ensure that you don't >> provision any PSID which results in the well known ports. >> > >> > cheers, >> > Ole >> > >> > > >> > > On 2 June 2014 21:49, Tom Taylor <tom.taylor.stds@gmail.com> wrote: >> > > There's a difference between setting a=6 and setting aside the lowest >> PSIDs because they occupy that port space. The value of a determines how >> ports are assigned to each PSID, but does not affect the usable PSID >> numbering space. >> > > >> > > I think that you should illustrate how you think this would work >> before we reach a conclusion. >> > > A setting of a=6 arrives precisely at what the goal is here, exclude >> ports 0-1024. So if there is a need to have another way of achieving that, >> by creating some excluded magic PSID value that corresponds to 0-1024, we >> would like to know why is that relevant and how it is supposed to work in a >> system where the PSID conveys to the CE the port-range. >> > > >> > > Regards. >> > > >> > > >> > > RECOMMENDED is part of the RFC 2119 boilerplate. The >> (unintentionally) missing term is NOT RECOMMENDED. >> > > >> > > Tom >> > > >> > > >> > > On 02/06/2014 3:27 PM, Wojciech Dec wrote: >> > > Well, I'm referring to the "RECOMMENDED" part. If the recommendation >> is NOT >> > > to allocate ports 0-1024, then this effectively recommends that >> a-bits=6. >> > > Moreover the meaning of SHOULD vs RECOMMEND should be questioned. The >> > > latter is not a regular normative term, and arguably if the >> recommendation >> > > is for excluding 0-1024 then a=6 looks like the SHOULD. If anyone >> wants the >> > > full port set, then a=0 would be an obvious consequence. >> > > >> > > >> > > On 2 June 2014 19:50, Tom Taylor <tom.taylor.stds@gmail.com> wrote: >> > > >> > > Not sure how you read that, but it can be fixed by putting a comma >> after >> > > "SHOULD be 0" and replacing "to allocate" with "thus allocating". >> > > >> > > Tom >> > > >> > > >> > > On 02/06/2014 12:14 PM, Wojciech Dec wrote: >> > > >> > > Uhm, this appears to mean that the RECOMMENDED a-bits SHOULD be 6. >> > > >> > > >> > > On 26 May 2014 13:24, Ian Farrer <ianfarrer@gmx.com> wrote: >> > > >> > > Hi, >> > > >> > > This one slipped my mind…. >> > > >> > > From a discussion with Ole during the MAP dhcp last call, there was >> a >> > > discussion about the exclusion of provisioning WKPs to CPEs - >> > > http://www.ietf.org/mail-archive/web/softwires/current/msg06010.html >> > > >> > > In previous versions, the lw4o6 used to reference >> > > sun-dhc-port-set-option, >> > > which also stated that the WKPs should not be assigned. This advice >> got >> > > lost when changing to reference map-dhcp for PSID format. >> > > >> > > Here’s a wording change proposal to resolve this: >> > > >> > > Section 5.1 >> > > >> > > Original text (last sentence, para 7): >> > > >> > > "For lw4o6, the number of a-bits SHOULD be 0." >> > > >> > > Proposed change: >> > > >> > > "For lw4o6, the number of a-bits SHOULD be 0 to allocate a single >> > > contiguous port set to each lwB4. >> > > >> > > Unless a lwB4 is being allocated a full IPv4 address, it is >> RECOMMENDED >> > > that PSIDs containing the well-known ports (0-1023) are not allocated >> to >> > > lwB4s.” >> > > >> > > Please let me know if you are OK with the proposed change. >> > > >> > > cheers, >> > > Ian >> > > >> > > >> > > Good spot on the WKP exclusion. Before the lw4o6 draft was updated >> to >> > > >> > > reference map-dhcp for configuration, the port configuration was >> > > described >> > > in sun-dhc-port-set-option, which also stated that the WKPs should >> not be >> > > assigned. This advice got lost when changing to reference map-dhcp. >> I’ll >> > > make a suggested text update for the lw4o6 draft to fix this. Does >> that >> > > work for you? >> > > >> > > >> > > yes, that would be good. >> > > >> > > cheers, >> > > Ole >> > > >> > > >> > > _______________________________________________ >> > > Softwires mailing list >> > > Softwires@ietf.org >> > > https://www.ietf.org/mailman/listinfo/softwires >> > > >> > > >> > > >> > > >> > > _______________________________________________ >> > > Softwires mailing list >> > > Softwires@ietf.org >> > > https://www.ietf.org/mailman/listinfo/softwires >> > > >> > > >> > > >> > > >> > >> > >> >> > > _______________________________________________ > Softwires mailing list > Softwires@ietf.org > https://www.ietf.org/mailman/listinfo/softwires > >
- [Softwires] Working group last call for draft-iet… Suresh Krishnan
- Re: [Softwires] Working group last call for draft… Xing Li
- Re: [Softwires] Working group last call for draft… Ian Farrer
- Re: [Softwires] Working group last call for draft… Ole Troan
- Re: [Softwires] Working group last call for draft… Ole Troan
- [Softwires] WGLC for draft-ietf-softwire-map-dhcp… Tomek Mrugalski
- Re: [Softwires] Working group last call for draft… Ian Farrer
- Re: [Softwires] Working group last call for draft… Ole Troan
- Re: [Softwires] Working group last call for draft… Ian Farrer
- Re: [Softwires] Working group last call for draft… Tom Taylor
- Re: [Softwires] Working group last call for draft… Ole Troan
- Re: [Softwires] Working group last call for draft… Tom Taylor
- Re: [Softwires] Working group last call for draft… Ole Troan
- Re: [Softwires] Working group last call for draft… Ian Farrer
- Re: [Softwires] Working group last call for draft… Rajiv Asati (rajiva)
- Re: [Softwires] [dhcwg] WGLC for draft-ietf-softw… Bernie Volz (volz)
- Re: [Softwires] Working group last call for draft… Ole Troan
- Re: [Softwires] Working group last call for draft… Ian Farrer
- [Softwires] draft-ietf-softwire-lw4over6 excludin… Ian Farrer
- Re: [Softwires] draft-ietf-softwire-lw4over6 excl… Tom Taylor
- Re: [Softwires] draft-ietf-softwire-lw4over6 excl… Wojciech Dec
- Re: [Softwires] draft-ietf-softwire-lw4over6 excl… Tom Taylor
- Re: [Softwires] draft-ietf-softwire-lw4over6 excl… Wojciech Dec
- Re: [Softwires] draft-ietf-softwire-lw4over6 excl… Tom Taylor
- Re: [Softwires] draft-ietf-softwire-lw4over6 excl… Wojciech Dec
- Re: [Softwires] draft-ietf-softwire-lw4over6 excl… Ole Troan
- Re: [Softwires] draft-ietf-softwire-lw4over6 excl… Wojciech Dec
- Re: [Softwires] draft-ietf-softwire-lw4over6 excl… Ole Troan
- Re: [Softwires] draft-ietf-softwire-lw4over6 excl… Wojciech Dec
- Re: [Softwires] draft-ietf-softwire-lw4over6 excl… Ole Troan
- Re: [Softwires] draft-ietf-softwire-lw4over6 excl… Cong Liu
- Re: [Softwires] draft-ietf-softwire-lw4over6 excl… Wojciech Dec
- Re: [Softwires] draft-ietf-softwire-lw4over6 excl… Wojciech Dec
- Re: [Softwires] draft-ietf-softwire-lw4over6 excl… ian.farrer
- Re: [Softwires] draft-ietf-softwire-lw4over6 excl… Yuchi Chen
- Re: [Softwires] draft-ietf-softwire-lw4over6 excl… Wojciech Dec
- Re: [Softwires] draft-ietf-softwire-lw4over6 excl… ian.farrer