[HECnet] Intermittent Connection with PyDECnet?

------------------------------------------------------------------------ On 3/10/20 9:40 AM, Paul Koning wrote: Thanks, sorry for leaving that dangling. I'll test that and merge it into my code. paul > ------------------------------------------------------------------------ > On Mar 10, 2020, at 4:28 AM, Keith Halewood <Keith.Halewood at pitbulluk.org> wrote: > > 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 > > ------------------------------------------------------------------------ > 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 >> FWIW, the "tap:" option in pyDECnet never worked for me. I use pcap > to >> access tap devices - >> >> circuit TAP-0 Ethernet pcap:tap0 --single-address --cost=2 >> >> works for me with Ubuntu 18.04... > 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!! >