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List: ipng
Subject: RE: Questions about draft-ietf-ipv6-inet-tunnel-mib-02.txt
From: "Dave Thaler" <dthaler () windows ! microsoft ! com>
Date: 2004-08-25 0:43:23
Message-ID: C9588551DE135A41AA2626CB645309370AC877CE () WIN-MSG-10 ! wingroup ! windeploy ! ntdev ! microsoft ! com
[Download RAW message or body]
> -----Original Message-----
> From: Ville Nuorvala [mailto:vnuorval@tcs.hut.fi]
> Sent: Monday, August 23, 2004 2:08 AM
> To: Dave Thaler
>
> Hi Dave,
>
> I just skimmed through your draft prompted by the the IESG last call
> message sent to the IPv6 WG list.
>
> Having worked with IPv6-in-IPv6 tunnels, I was looking at your draft
from
> the IPv6 point of view. There seem to be MIB entries for TOS,
FlowLabel,
> Hop Limit and such, but the Tunnel Encapsulation Limit defined in RFC
2473
> is missing. Is this intentional? I was also surprised not to see the
afore
> mentioned RFC being mentioned as a reference.
I don't think it's been explicitly discussed, so I don't think it's
intentional. Some history...
The following was present in I-D's prior to RFC 2667 up to
draft-ietf-ifmib-tunnel-mib-04.txt (which you can find with
a web search):
tunnelIfEncapsLimit OBJECT-TYPE
SYNTAX Integer32
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The maximum number of encapsulations permitted for packets
undergoing encapsulation at this node. A value of 0
indicates that no limit is present (except as a result of
the packet size)."
::= { tunnelIfEntry 7 }
However, it was removed before publication as an RFC, since
RFC 2667 was IPv4-specific, and (as far as we knew) no such
limit exists for IPv4.
When converting the MIB to be version-agnostic, it was not added back
in (but could be). RFC 2473 is a bit vague though on whether this
is a per-node or a per-tunnel limit.
Question to tunnel implementers:
1) Do you support the Tunnel Encapsulation Limit?
2) If so, is it configurable per tunnel?
Assuming there are implementations, I am happy to add this back in
(probably as per-interface, like it was before), although to be
more consistent with what goes into the Dest Option, I'd change the
range to be (-1 | 0..255) where -1 means just limited by MTU and
0..255 is the value placed in the option, i.e.:
tunnelIfEncapsLimit OBJECT-TYPE
SYNTAX Integer32 (-1 | 0..255)
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The maximum number of additional encapsulations permitted
for packets undergoing encapsulation at this node. A value
of -1 indicates that no limit is present (except as a result
of the packet size)."
REFERENCE "RFC 2473, section 4.1.1"
::= { tunnelIfEntry 11 }
-Dave
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