Hi,
On Thu, Apr 19, 2001 at 03:02:03PM -0700, Jim Warner wrote:
> > The router will *never* retransmit a packet, except if the
> > router is also the end station of the TCP connection
> > ("telnet to router").
>
> "Never" is a pretty strong word. If the underlying link protocol
> calls for hop-by-hop acks, then packets are buffered until
> ack'd and retransmitted as necessary. The list of link protocols
> that do NOT do this is pretty long: ethernet, token ring, frame
> relay, SMDS, HDLC encapsulated sync serial...even localtalk.
Ummm, well, you're right here.
But then it's not like "a TCP retransmission" but "a layer2 error
correction" - so it's not actually a *packet* that is retransmitted, but
some arbitrary bytes that happen to be in the layer2 frame that got lost
or corrupted (for X.25 or V.42, the link frames do not have correspond
to IP packets).
But that's nitpicking :-) - I stand corrected.
gert
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Gert Doering - Munich, Germany gert@greenie.muc.de
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