And reading further down into doc/config.txt it has

"--phase-5: applies only to bridge circuits.  By default, only DECnet
Phase IV packets are accepted from and sent to this circuit.  If
--phase5 is supplied, OSI packets (802.3 format packets with SAP
address 0xFE) are also accepted."

So I retract my previous statement (it's been a few years since I read this).

Tony

On Fri, Jul 18, 2025 at 7:42 AM Tony Nicholson <tony.nicholson@computer.org> wrote:
On Fri, Jul 18, 2025 at 7:28 AM Robert Armstrong <bob@jfcl.com> wrote:
> Tony Nicholson <tony.nicholson@computer.org> wrote:
> It [pyDECnet] normally accepts DECnet/MOP and LAT (EtherTypes 0x8003,
>0x8002 and 0x8004) Ethernet frames and tunnels them in IPv4 to another router.

  Are you sure?  I don't think pyDECnet can tunnel either MOP nor LAT ...

From the pydecnet doc/config.txt file

"--mop: applies only to bridge circuits.  By default, only DECnet Phase
IV packets are accepted from and sent to this circuit.  If --mop is
supplied, MOP, LAT, and loopback protocol packets are also accepted.
This corresponds to the [lat] section in the bridge.conf file for the
original bridge.c program."

Tony
 
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--
Tony Nicholson <tony.nicholson@computer.org>