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RE: New Version Notification for draft-herbert-6man-icmp-limits-01.txt

Ron Bonica <rbonica@juniper.net> Tue, 23 May 2017 19:26 UTC

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From: Ron Bonica <rbonica@juniper.net>
To: Tom Herbert <tom@herbertland.com>
CC: Mark Smith <markzzzsmith@gmail.com>, "6man@ietf.org" <6man@ietf.org>
Subject: RE: New Version Notification for draft-herbert-6man-icmp-limits-01.txt
Thread-Topic: New Version Notification for draft-herbert-6man-icmp-limits-01.txt
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Date: Tue, 23 May 2017 19:26:46 +0000
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Hi Tom,

I think that we are converging. The Parameter Problem message is appropriate for the following error codes:

      Code 
         1 - Unrecognized Next Header type encountered
         4 - Extension header too big
         5 - Extension header chain too long
         6 - Too many options in extension header

For error codes 4, 5, and 6, the pointer should reference the first *invalid* byte. This will allow the source node to infer:
 
      Code
         4 - The maximum extension header length
         5 - The maximum extension header chain length
         6 - The maximum number of options in the extension header

Even when none of the above-mentioned errors occur, a middle box may discard a packet because the Total Header Length (THL) has been exceeded. The total header length is the sum of the IPv6 header length, the IPv6 extension header chain length and the encapsulation header.

In order for the middle-box to inform the source of a THL violation, it can send either:

- a new ICMP message
- a Destination Unreachable Message

I have no preference. 

However, if you choose, the Destination Unreachable message, you will want to inform the source of the Maximum Header Length. RFC 4884 provides a mechanism that you can use to piggyback this information on the Destination unreachable.

                                                                                  Ron

> -----Original Message-----
> From: Tom Herbert [mailto:tom@herbertland.com]
> Sent: Monday, May 22, 2017 5:20 PM
> To: Ron Bonica <rbonica@juniper.net>
> Cc: Mark Smith <markzzzsmith@gmail.com>; 6man@ietf.org
> Subject: Re: New Version Notification for draft-herbert-6man-icmp-limits-
> 01.txt
>

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