Hi James

Both packet counts and Mbps counts are important as they both consume
resources (packets need to each be processed by the router, and a link has
only a limited number of Mbps data can consume).

Remember that every packet can be as short as 64 Bytes or much much larger
(usually up to 1518 Bytes but could be even larger)

In theory for every packet being sent there should be an acknowledgement
(ACK, for TCP and some other protocols) or potentially a reply. For ACK
packets these are usually minimum length packets and depending on the
details of what was being communicated then a reply may be minimum sized,
the same as the original packet, or very much bigger (even fragmented).
Acknowledgements can also be "selective" in the sense that not every packet
gets its own ACK to reduce packet count on the wire.

Different types of communication also attract packets of different sizes
and with different types of responses. For example an RTP stream for a
phone call using 711A/U codec's will often present approximately 50 Packets
per second of approx 200 Bytes in length and overall uses approximately
80Kbps on the link.

1500B packets obviously pass a lot of traffic with a small packet count,
64B packets need a much larger number of packets to pass the same amount of
traffic. Your screenshot looks to me (talking about the current flow) that
you probably have a good speed TCP connection on the line with replies
using selective acknowledgement explaining some of the reduced packet count
in one direction.

Apologies if this didn't answer the question you really had, if you expand
in more detail what you want to know I am sure myself and / or others would
be able to help out.

Regards
Alexander
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