[HECnet] Intermittent Connection with PyDECnet?

Hi, These are the changes: In Ethernet.py: 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 With the definitions of those constants up near the top: TUNSETIFF = 0x400454ca TUNSETOWNER = TUNSETIFF + 2 IFF_TUN = 0x0001 IFF_TAP = 0x0002 IFF_NO_PI = 0x1000 Keith -----Original Message----- From: owner-hecnet at Update.UU.SE [mailto:owner-hecnet at Update.UU.SE] On Behalf Of David Moylan Sent: 10 March 2020 07:46 To: hecnet at Update.UU.SE Subject: RE: [HECnet] Intermittent Connection with PyDECnet? Robert Armstrong said on Tuesday, 10 March 2020 4:17 AM to When I first went to play with pyDECnet under Ubuntu 18, I also discovered issues with the tap adapter. Fundamentally the issue comes down to newer kernels (such as in Ubuntu 18) that use a /dev/net/tun interface to communicate instead of /dev/tapx I heard on the list that Keith Halewood had modified Paul's code to work with the newer interface standard, so I reached out to him and he provided me with the changes. It's only a few lines of code that need modification. I believe Keith has provided Paul with the changes. I'd love to see them become mainstream in pyDECnet, as at the moment if I pull down a new build, I have to make the modifications by hand again. With the code changes, tap works a dream for me. circuit tap-1022 Ethernet tap:tap1022 --random-address cheers, Wiz!!