>1. Is there an exact formula to compute how much RAM,
or how good a CPU i would need for a pc router?

>2. How would one know that the pc router is already
being overwhelmed? Are dropped packets the only sign?
So far i haven't seen any dropped packets at the
company's router, but i have some nagging suspicions
that it's slowing us down.
 

One thing to look at is "ip -s link show" which will show you any errors on
your network interfaces.  If you are getting errors there, that would appear
to you as the router slowing you down.

How much RAM and CPU depends on the application.  I think if you describe
what you are doing with the router, how big the rule set is, how fast the
connections are, etc, someone on this list with similar experience could
tell you if your machine is big enough.  

In my experience, the quality of the NICs and the system bus seems to be
more important than a blazing fast CPU.  RAM depends on what packages you
are loading, and to some extent on how many connections you are tracking.  





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