HL2 switch compatibility

[Alexander Harvey]

I have a Hermes Lite 2 that works great if I have it connected directly to my laptop, but it fails to negotiate a link with my Netgear G5308P gigabit switch. I've tried several ports and cables that work with other devices to no avail.

Is there any special considerations about the HL2 and switch compatibility? I wasn't able to find documentation about this.

Thanks,

-Alex // KO4CEE

[Clifford Heath]

I believe that discovery relies on UDP broadcasts, and some gateways don’t forward those unless configured for it. Lower-level network switched and bridges do, of course.

Clifford Heath.

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["Christoph v. Wüllen"]

The HL2 also responds to a "routed" discovery packet, that is, a Packet

sent to its specific IP address. Strictly speaking, this violates the

HPSDR protocol but be relaxed, my Anan-7000 behaves the same way.

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[ron.ni...@gmail.com]

Some computers (various macOS and iOS versions, for instance) or network routers (with some firewall options enabled) won't forward UDP broadcasts, which typical OpenHPSDR METIS Protocol 1 negotiation to find an HL2 seems to require.

If you know the DHCP IP range that your router provides to its local subnet, you can do a very manual discovery search for the HL2's IP address.  Unplug the HL2 then ping every address in the IP range, plug the HL2 back in, wait for the LEDs to indicate it's network is up, then ping for any newly appearing IP address, which is likely the IP address of the HL2 just turned on.

If you can compile and run hl2_tcp (on GitHub), then you can also send directed (not broadcast) UDP discovery packets to an HL2 using the -d option.

> hl2_tcp -d 192.168.10.4

or use your suspected IP address. The HL2 will respond to any UDP discovery message, broadcast or directed.

73, Ron, N6YWU

[Clifford Heath]

You don't need to ping every IP address if you save the ARP table before and after. On Linux you can get that using the "arp" command.

Clifford Heath 

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