[hpsdr] How to configure a hermes IP connection?

[Tom McDermott]

Hi Jim - using the version 3.1  (the 'old' protocol) on my Hermes it
retrieves a DHCP address
automatically.   It used to be that switches and routers would not remember
which
devices used which addresses, meaning that any particular device on your
home LAN
could change IP addresses when power cycled.  this was a real pain when
opening
firewall ports for example.

However modern Ethernet switches and routers usually now have a
'reservations'
table that auto populates.  It remembers which MAC devices got which IP
address
in the past, and it makes sure to re-assign that exact same IP address to
that same device
in the future.     So for most common cases I can think of, the use of
static IP is really
not needed anymore.

Ethernet added an MDI-X PHY type for 100Meg and 1Gig awhile ago.  For
devices made in
the last few years, they will automatically auto-crossover if needed.   The
Ethernet
interface in your computer may or may not have the capability, but I
suspect that your
Ethernet switch or router does.   That's why when you hook Hermes to that
more modern
switch or router, it will detect the configuration and auto-crossover if it
is needed.

So if you connect two old computers at 100M you might need a crossover
cable, but
if they are recent or you have a switch or router in the path, it should
automatically work.
1G Ethernet usually always does the MDI-X function.  That's because 1GE
uses all 4
pairs in the cable at the same time.  In fact all 4 pairs are operating
full-duplex, 1GE sends
lane identifier information down each pair so the receiver can figure out
what's going on.

-- Tom, N5EG
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