[HECnet] Configuring py-decnet.

[Keith Halewood]

The quick and dirty patch:

Add the following to the top of ethernet.py:

TUNSETIFF = 0x400454ca
TUNSETOWNER = TUNSETIFF + 2
IFF_TUN = 0x0001
IFF_TAP = 0x0002
IFF_NO_PI = 0x1000

Modify the top half of _TapEth class as:

if fcntl:
    class _TapEth (_Ethernet):
        def open (self):
            fd = os.open('/dev/net/tun', os.O_RDWR | os.O_NONBLOCK)
            ifr = struct.pack('16sH', self.dev.encode('utf-8'), IFF_TAP | IFF_NO_PI)
            ioctl(fd, TUNSETIFF, ifr)
            self.tap = fd
            self.sellist = ( fd, )
            # Turn the interface on -- needed only on Mac OS

Keith


From: owner-hecnet at Update.UU.SE [mailto:owner-hecnet at Update.UU.SE] On Behalf Of Paul Koning
Sent: 22 August 2020 20:28
To: hecnet at update.uu.se
Subject: Re: [HECnet] Configuring py-decnet.

Correct.  I need to get that patch integrated, but I haven't used TAP in 5 years or so.  That means it takes a bit of time for me to understand it and check it.  I use PCAP normally, and that works well.

            paul


On Aug 22, 2020, at 2:59 PM, Robert Armstrong <bob at jfcl.com<mailto:bob at jfcl.com>> wrote:

>rsts/e --> delqua --> virtual tap ethernet --> pydecnet --> real-ethernet --> GRE tunnel.

  FWIW, I don’t believe that the “tap:” support in pyDECnet works out of the box.  There’s a patch for it floating around that somebody did, but I can’t remember who just offhand.  Hopefully somebody can remind me.

  An alternative is to use pcap to connect pyDECnet to a TAP device.  That works just fine, and I use that setup here to connect pyDECnet to a simulated VAX.

Bob

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