New submission from Neil Booth <kyuupic...@gmail.com>:
I run a machine with IPv4 and IPv6 interfaces on MacOSX Mojave. I try to loop.create_connection() to a remote machine whose domain resolves to an IPv6 address only, with a local_addr domain name argument that resolves to two local addresses: an IPv4 one first and an IPv6 one second. The loop https://github.com/python/cpython/blob/master/Lib/asyncio/base_events.py#L927-L943 that loops through the local addresses, IPv4 then IPv6, successfully binds the IPv4 laddr_info to the IPv6 socket successfully (something I find surprising) and then the connection attempt fails with OSError(65, 'No route to host'), at which point the sockets is closed and the IPv6 laddr_info is never tried and the connection attempt fails. If I reverse the order of the loop so that the IPv6 laddr_info is tried first then the connection succeeds. I suggest either all laddr_info bindings should be tried for each outer loop of infos, rather than just 1, or that those of a different socket "type" (IPv4 vs IPv6) should be skipped in the inner loop before attempting a binding. ---------- components: asyncio messages: 330354 nosy: asvetlov, kyuupichan, yselivanov priority: normal severity: normal status: open title: create_connection with local_addr misses valid socket bindings type: behavior versions: Python 3.5, Python 3.6, Python 3.7 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue35302> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
