[e2e] Simple Question on TCP Window Size

David P. Reed dpreed at reed.com
Thu May 10 10:50:57 PDT 2001

At 07:57 PM 5/9/01 -0600, Vernon Schryver wrote:
>Perhaps you could sneak the ECN bits that arrive with the UDP datagram
>into the mbuf that holds the source address, then have a modified recvmsg()
>marked by a new flags bit that would set msg_flags with the ECN bits.  It
>might be possible to get that into the freely redistributable BSD and
>Linux and some of the commercial UNIX systems within a year or two.
>It sounds like a major hurdle for the Pacific Northwest operating systems
>that still don't even understand setsockopt(, IPPROTO_IP, IP_TOS,), which
>could be far more useful to audio and video UDP applications than any ECN

In general it would be more correctly in the spirit of IP's interface if 
all "sockets" implementations let UDP set all IP options and see all the IP 
header info on incoming UDP datagrams.  Christian Huitema should have some 
input on that for at least one NW rainforest company.

- David
WWW Page: http://www.reed.com/dpr.html

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