Re: [ipwave] I-D Action: draft-ietf-ipwave-ipv6-over-80211ocb-01.txt - double mention of "Seq num" - keep one

[Alexandre Petrescu <[e-mail]>]

Michelle,

You are pointing that we talk twice about apparently the same thing:
increasing the "Seq number" field of the 802.11 Header when the MTU is
smaller than the IP packet to be sent.

The paragraphs in question are:
> The default MTU for IP packets on 802.11p is 1500 octets.  It is the
>  same value as IPv6 packets on Ethernet links, as specified in
> [RFC2464].  This value of the MTU respects the recommendation that
> every link in the Internet must have a minimum MTU of 1280 octets
> (stated in [RFC2460], and the recommendations therein, especially
> with respect to fragmentation).  If IPv6 packets of size larger than
>  1500 bytes are sent on an 802.11-OCB interface then the IP stack
> will fragment.  In case there are IP fragments, the field "Sequence
> number" of the 802.11 Data header containing the IP fragment field is
> increased.

and

> When the MTU value is smaller than the size of the IP packet to be
> sent, the IP layer fragments the packet into multiple IP fragments.
> During this operation, the "Sequence number" field of the 802.11 Data
> Header is increased.

I propose to replace the latter with a brief explanation:

> The Ethernet Adaptation Layer performs operations in relation to IP
> fragmentation and MTU.  One of these operations is briefly described
> in section <xref target="MTU"/>.


Alex