Suresh, all my comments have been addressed.
cheers, Ole > Hi all (specifically people in the To: list), > Since you were involved in the discussion on this topic, can you please > look over the latest version of the lw4over6 draft and see if the change > addresses your concern. The latest version of the draft is at > > http://tools.ietf.org/html/draft-ietf-softwire-lw4over6-09 > > and the diff can be found here > > http://tools.ietf.org/rfcdiff?url2=draft-ietf-softwire-lw4over6-09.txt > > Thanks > Suresh > > > From: Softwires [mailto:[email protected]] On Behalf Of > [email protected] > Sent: June-03-14 10:16 AM > To: [email protected] > Cc: [email protected]; [email protected]; [email protected]; > [email protected] > Subject: Re: [Softwires] draft-ietf-softwire-lw4over6 excluding Well Known > Ports > > Hi Woj, > > I don’t think that there is a problem. For the purpose of the example that I > sent you (and to answer your specific question), I rather quickly did a mock > up of what the config might look like with psid. The current actual > implementation that we have is still based on the port-min, port-max format > that was described in an older version of the draft before we settled on PSID > (it needs to be updated now this has stabilised): Here’s an actual config > line: > > 2001:10f:60:1ff::0:b4 1.2.30.121 port 4096 to 8191 > > So, the problem results from my dodgy example rather than anything else. > > Cheers, > Ian > > > From: Wojciech Dec <[email protected]> > Date: Tuesday, 3 June 2014 15:44 > To: Ian Farrer <[email protected]> > Cc: Ole Troan <[email protected]>, Tom Taylor <[email protected]>, Ian > Farrer <[email protected]>, "[email protected]" > <[email protected]>, Yong Cui > <[email protected]>, Softwires-wg <[email protected]> > Subject: Re: [Softwires] draft-ietf-softwire-lw4over6 excluding Well Known > Ports > > Hi Ian, > > thanks for the example. This helps to illustrate, although the numbers > provided don't seem to add up (at least in terms of the algorithm and meaning > of PSID). > For 4096 ports per CE, one needs 12 "freely" bits of address space. The PSID, > as per the draft, is the fixed code point that uniquely per CE indexes that > address space (ie a subnet address). The length of the PSID is the k-bits. > Thus for the example above k-bits should be 4. This, along with a=0, actually > works out to be then numerically as per the PSIDs you provide. > If the meaning the lw46 implementation puts a different meaning on the > k-bits, then there is a problem... > > Cheers > > > > > > On 3 June 2014 13:09, <[email protected]> wrote: > Hi Woj, > > Here’s an example from an lwAFTR binding table. In this case, there’s 4096 > ports per client (k-bits =12, a-bits=0). PSID 0 just isn’t in the table. > > 2001:10f:60:6ff::0:b4 1.2.30.126 PSID 4096 > 2001:10f:60:6ff::1:b4 1.2.30.126 PSID 8192 > 2001:10f:60:6ff::2:b4 1.2.30.126 PSID 12288 > 2001:10f:60:6ff::3:b4 1.2.30.126 PSID 16384 > 2001:10f:60:6ff::4:b4 1.2.30.126 PSID 20480 > 2001:10f:60:6ff::5:b4 1.2.30.126 PSID 24576 > 2001:10f:60:6ff::6:b4 1.2.30.126 PSID 28672 > 2001:10f:60:6ff::7:b4 1.2.30.126 PSID 32768 > 2001:10f:60:6ff::8:b4 1.2.30.126 PSID 36864 > 2001:10f:60:6ff::9:b4 1.2.30.126 PSID 40960 > 2001:10f:60:6ff::a:b4 1.2.30.126 PSID 45056 > 2001:10f:60:6ff::b:b4 1.2.30.126 PSID 49152 > 2001:10f:60:6ff::c:b4 1.2.30.126 PSID 53248 > 2001:10f:60:6ff::d:b4 1.2.30.126 PSID 57344 > 2001:10f:60:6ff::e:b4 1.2.30.126 PSID 61440 > 2001:10f:60:7ff::0:b4 1.2.30.127 PSID 4096 > 2001:10f:60:7ff::1:b4 1.2.30.127 PSID 8192 > 2001:10f:60:7ff::2:b4 1.2.30.127 PSID 12288 > 2001:10f:60:7ff::3:b4 1.2.30.127 PSID 16384 > 2001:10f:60:7ff::4:b4 1.2.30.127 PSID 20480 > 2001:10f:60:7ff::5:b4 1.2.30.127 PSID 24576 > 2001:10f:60:7ff::6:b4 1.2.30.127 PSID 28672 > 2001:10f:60:7ff::7:b4 1.2.30.127 PSID 32768 > 2001:10f:60:7ff::8:b4 1.2.30.127 PSID 36864 > 2001:10f:60:7ff::9:b4 1.2.30.127 PSID 40960 > 2001:10f:60:7ff::a:b4 1.2.30.127 PSID 45056 > 2001:10f:60:7ff::b:b4 1.2.30.127 PSID 49152 > 2001:10f:60:7ff::c:b4 1.2.30.127 PSID 53248 > 2001:10f:60:7ff::d:b4 1.2.30.127 PSID 57344 > 2001:10f:60:7ff::e:b4 1.2.30.127 PSID 61440 > > Cheers, > Ian > > > From: Wojciech Dec <[email protected]> > Date: Tuesday, 3 June 2014 12:39 > To: Ole Troan <[email protected]> > Cc: Tom Taylor <[email protected]>, Ian Farrer <[email protected]>, > "[email protected]" > <[email protected]>, Yong Cui > <[email protected]>, Softwires WG <[email protected]> > Subject: Re: [Softwires] draft-ietf-softwire-lw4over6 excluding Well Known > Ports > Resent-To: Ian Farrer <[email protected]>, Mohamed Boucadair > <[email protected]>, <[email protected]>, <[email protected]>, > <[email protected]>, <[email protected]> > > How so, could you give an example? > > > On 3 June 2014 12:17, Ole Troan <[email protected]> wrote: > Wojciech, > > > 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... > > sorry, yes, you'd not assign 0000/6. > that's not equivalent to a=6 though. > > cheers, > Ole > > > > > > > > > > > > > > > > On 3 June 2014 11:31, Ole Troan <[email protected]> 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 <[email protected]> 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 <[email protected]> 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 <[email protected]> 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 <[email protected]> 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 > > > > [email protected] > > > > https://www.ietf.org/mailman/listinfo/softwires > > > > > > > > > > > > > > > > > > > > _______________________________________________ > > > > Softwires mailing list > > > > [email protected] > > > > https://www.ietf.org/mailman/listinfo/softwires > > > > > > > > > > > > > > > > > > > > > > > > > > >
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