[hpsdr] Fwd: Re: How to configure a hermes IP connection?

[Jim Lynch]

I forgot to add the group to this reply.

Jim



-------- Forwarded Message --------
Subject: 	Re: [hpsdr] How to configure a hermes IP connection?
Date: 	Fri, 27 Oct 2017 15:14:39 -0400
From: 	Jim Lynch <jim at k4gvo.com>
To: 	Tom McDermott <tom.n5eg at gmail.com>



On 10/27/2017 02:40 PM, Tom McDermott wrote:
> 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.
I understand and make use of that often or sometimes I set a static
address in the router configuration for a specific mac address just to
be sure.  I stick a lot of different devices on my lan so I know once it
a while the leases get reused.   It's just that the Hermes isn't looking
for a dhcp server as far as I can tell.  I have looked in the device
table on my router and there's nothing there that I don't already know
what is.
>
> 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.
I am assuming the Hermes doesn't do auto-crossover.  I'm using a
USB-Ethernet dongle, so I'm not surprised it doesn't either.  The laptop
is too new to have an Ethernet port.
>
> 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.
It worked in the past but only when I connected it directly to the
computer and knew what the address of the Hermes was and configured a
static address in my computer to be on the same network. However I've
forgotten what that network/static address was.  I'm fairly certain that
the procedure at the beginning of time according to Hermes was to
connect directly from the Hermes to the computer, set a new ip address
in the Hermes that is on the LAN, then connect the Hermes to the LAN.
But then my memory is not what it used to be.

So I guess the question is how can I get this thing to play?

Thanks,
Jim
>
> -- Tom, N5EG
>
>

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