> Even for radio links where this isn't true, I still feel pretty
> strongly that TCP should not have to be "educated" about noise-induced
> errors on wireless links when there exists a much more focused,
> effective and cleanly-layered solution to the problem: link-level ARQ
> and FEC. If the link layer is going to the effort to generate a "link
> level error" message to tell TCP to retransmit, why shouldn't it just
> retransmit the packet itself?
But, doesn't the issue of the TCP RTT calculation need to be taken into
account? Are you assuming that the TCP stack is using an appropriate RTT
calculation for the environment that it is in? If so, I agree with your
statement but it seems to exclude the wireless link being between two
intermediate nodes (where the TCP stacks may not even be aware that a wireless
link is involved).
John Border
Hughes Network Systems
This archive was generated by hypermail 2b29 : Mon Jan 28 2002 - 09:12:20 EST