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ports in the clear...
> There are lots of reasons, from bean counting ("what % of the
> internet traffic is web traffic?") to firewalls to "best effort QoS"
> (make telnet port low latency; make ftp data port high throughput).
Using port numbers for quality of service is The Wrong Way To Do It.
The TOS (Type of Service) field is for this, and it reveals much less
other information.
Attaching type of service semantics to port numbers makes adding new
services extremely painful, because it is impossible to control their
routing priority. IPTOS is much more flexible, extensible, and
scalable. Almost all machines already set IPTOS in outgoing packets
according to the type of the service.
Tatu
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