Ron,
I agree with Bob, Darren and Kamran that the existing IPv6 processing rules are
followed in Network Programming and do not need to be re-stated.
Cheers,
Pablo.
-----Original Message-----
From: spring <spring-boun...@ietf.org> on behalf of Ron Bonica
<rbonica=40juniper....@dmarc.ietf.org>
Date: Friday, 6 December 2019 at 17:17
To: "Darren Dukes (ddukes)" <ddu...@cisco.com>
Cc: SPRING WG <spring@ietf.org>, Bob Hinden <bob.hin...@gmail.com>, Mark Smith
<markzzzsm...@gmail.com>
Subject: Re: [spring] SRv6 Network Programming and Link Local Source Addresses
Darren,
If the draft adhered strictly to RFC 4291 and RFC 8200 in all other
respects, I would agree with you and Bob. However, it doesn't.
As it stands, the reader is left to guess when the draft adheres to
previous specifications, but doesn't say so explicitly, and when it is taking
liberties with previous specifications.
Ron
Juniper Business Use Only
-----Original Message-----
From: Darren Dukes (ddukes) <ddu...@cisco.com>
Sent: Friday, December 6, 2019 10:53 AM
To: Ron Bonica <rbon...@juniper.net>
Cc: Bob Hinden <bob.hin...@gmail.com>; SPRING WG <spring@ietf.org>; Mark
Smith <markzzzsm...@gmail.com>
Subject: Re: [spring] SRv6 Network Programming and Link Local Source
Addresses
Hi Ron, I agree with Bob here.
Section 4.2 pseudocode simply says an implementation would use a
predetermined egress adjacency instead of performing a FIB lookup to find one.
It specifies the SID processing, not the entire IPv6 data path.
It has no text that would indicate RFC4291 text on link-local addresses and
routers would not apply.
As a side note, every routing header currently defined (even those now
deprecated) do not re-state the RFC4291 text.
Thanks,
Darren
> On Dec 2, 2019, at 10:58 AM, Ron Bonica
<rbonica=40juniper....@dmarc.ietf.org> wrote:
>
> Bob,
>
> Before we debate presentation too much, we should let Pablo answer the
original question. Will the packet be dropped or forwarded?
>
> If the packet will be dropped, how is the reader of Section 4.2 to know
this? Normally, pseudocode is taken literally, and the pseudocode in Section
4.2 suggests that the packet will be forwarded.
>
> One way to wiggle out of this problem is to include a sentence at the
beginning of Section 4 saying, "When the following pseudocode contradicts RFC
4291 or 8200, RFCs 4291 and 8200 take precedence.
>
>
> Ron
>
>
>
>
> Juniper Business Use Only
>
> -----Original Message-----
> From: Bob Hinden <bob.hin...@gmail.com>
> Sent: Monday, December 2, 2019 10:47 AM
> To: Ron Bonica <rbon...@juniper.net>
> Cc: Bob Hinden <bob.hin...@gmail.com>; Mark Smith
> <markzzzsm...@gmail.com>; SPRING WG <spring@ietf.org>
> Subject: Re: [spring] SRv6 Network Programming and Link Local Source
> Addresses
>
> Ron,
>
>> On Dec 2, 2019, at 7:36 AM, Ron Bonica <rbon...@juniper.net> wrote:
>>
>> Bob,
>>
>> Take a look at Section 4.2. The pseudocode is pretty specific.
>
> Please explain. I don’t see that.
>
> Thanks,
> Bob
>
>
>>
>> Ron
>>
>>
>>
>> Juniper Business Use Only
>>
>> -----Original Message-----
>> From: Bob Hinden <bob.hin...@gmail.com>
>> Sent: Sunday, December 1, 2019 5:56 PM
>> To: Ron Bonica <rbon...@juniper.net>
>> Cc: Bob Hinden <bob.hin...@gmail.com>; Mark Smith
>> <markzzzsm...@gmail.com>; SPRING WG <spring@ietf.org>
>> Subject: Re: [spring] SRv6 Network Programming and Link Local Source
>> Addresses
>>
>> Ron,
>>
>>> On Dec 1, 2019, at 2:47 PM, Ron Bonica <rbon...@juniper.net> wrote:
>>>
>>> Mark, Bob,
>>>
>>> Yes, I agree that routers should not forward packets with link local
source addresses.
>>
>> or Destination addresses.
>>
>>>
>>> Pablo,
>>>
>>> Maybe we should update section 4.2 of the network programming draft to
reflect this?
>>
>> I was thinking that unless network programming has text that might cause
one to think it overrides the defined behavior from rfc4291 for link-local
addresses, I am not sure it has to be mentioned.
>>
>> Bob
>>
>>
>>>
>>> Ron
>>>
>>>
>>> From: Mark Smith <markzzzsm...@gmail.com>
>>> Sent: Sunday, December 1, 2019 5:31 PM
>>> To: Bob Hinden <bob.hin...@gmail.com>
>>> Cc: Ron Bonica <rbon...@juniper.net>; SPRING WG <spring@ietf.org>
>>> Subject: Re: [spring] SRv6 Network Programming and Link Local Source
>>> Addresses
>>>
>>>
>>>
>>> On Mon, 2 Dec 2019, 08:35 Bob Hinden, <bob.hin...@gmail.com> wrote:
>>> Ron,
>>>
>>>> On Nov 30, 2019, at 12:36 PM, Ron Bonica
<rbonica=40juniper....@dmarc.ietf.org> wrote:
>>>>
>>>> Pablo,
>>>>
>>>>
>>>>
>>>> Consider the packet (SA,DA) (S3, S2, S1; SL) where:
>>>>
>>>>
>>>>
>>>> • SA is link-local (fe80)
>>>> • DA, S3, S2, and S1 are all END.X
>>>>
>>>>
>>>> Section 4.2 suggests that this packet will be delivered over multiple
hops to its destination, regardless of its link-local source address.
>>>
>>> I would think that RFC2460 Section 2.5.6. "Link-Local IPv6 Unicast
Addresses” covers this:
>>>
>>> Link-Local addresses are for use on a single link. Link-Local
>>> addresses have the following format:
>>>
>>> | 10 |
>>> | bits | 54 bits | 64 bits |
>>> +----------+-------------------------+----------------------------+
>>> |1111111010| 0 | interface ID |
>>> +----------+-------------------------+----------------------------+
>>>
>>> Link-Local addresses are designed to be used for addressing on a
>>> single link for purposes such as automatic address configuration,
>>> neighbor discovery, or when no routers are present.
>>>
>>> Routers must not forward any packets with Link-Local source or
>>> destination addresses to other links.
>>>
>>> I think that's RFC4291.
>>>
>>> RFC4007, "IPv6 Scoped Address Architecture" does too, more generally
and probably more formally, in particular section 9, "Forwarding".
>>>
>>> Regards,
>>> Mark.
>>>
>>>
>>>
>>> Bob
>>>
>>>
>>>>
>>>>
>>>>
>>>> Is this the case?
>>>>
>>>>
>>>>
>>>> Ron
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> Juniper Business Use Only
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