René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Interface option InterfaceChoice.Default not working for IPv6","articleBody":"When trying to use `InterfaceChoice.Default` with IPv6 on Linux Python Zeroconf isn't able to start browsing/sending frames:\n\nE.g. running this snipped:\n\n```python\nimport asyncio\nimport logging\nfrom zeroconf import (\n    DNSQuestionType,\n    InterfaceChoice,\n    IPVersion,\n    ServiceStateChange,\n    Zeroconf,\n)\nfrom zeroconf.asyncio import AsyncServiceBrowser, AsyncZeroconf\n\nlogging.basicConfig(format='%(asctime)s %(message)s', level=logging.INFO)\nlogging.getLogger(\"zeroconf\").setLevel(logging.DEBUG)\n\ndef service_browser_handler(zeroconf: Zeroconf, service_type: str, name: str, state_change: ServiceStateChange) -\u003e None:\n    logging.info(\"mDNS service state change: %s - %s - %s\", name, service_type, state_change)\n\n\nasync def browse_service():\n    _aiozc = AsyncZeroconf(interfaces=InterfaceChoice.Default, ip_version=IPVersion.V6Only)\n    _aiobrowser = AsyncServiceBrowser(\n        _aiozc.zeroconf,\n        [\"_matter._tcp.local.\"],\n        handlers=[service_browser_handler],\n        question_type=DNSQuestionType.QM,\n    )\n\tawait asyncio.sleep(5)\n\nasyncio.run(browse_service())\n```\n\nThe same is true when trying to use dual-stack with `IPVersion.All`. Also the question type doesn't matter `DNSQuestionType.QU` won't get delivered either.\n\nLeads to the following output:\n```\n2025-04-10 16:17:46,736 Creating new socket with port 5353, ip_version IPVersion.V6Only, apple_p2p False and bind_addr ('',)\n2025-04-10 16:17:46,736 Created socket \u003csocket.socket fd=8, family=10, type=2, proto=0, laddr=('::', 5353, 0, 0)\u003e\n2025-04-10 16:17:46,736 Adding (('', 0, 0), 0) (socket 8) to multicast group\n2025-04-10 16:17:46,736 Listen socket \u003csocket.socket fd=8, family=10, type=2, proto=0, laddr=('::', 5353, 0, 0)\u003e, respond sockets [\u003csocket.socket fd=8, family=10, type=2, proto=0, laddr=('::', 5353, 0, 0)\u003e]\n2025-04-10 16:17:46,781 offsets = questions=0, answers=0, authorities=0, additionals=0\n2025-04-10 16:17:46,782 lengths = questions=1, answers=0, authorities=0, additionals=0\n2025-04-10 16:17:46,782 now offsets = questions=1, answers=0, authorities=0, additionals=0\n2025-04-10 16:17:46,782 Sending to (ff02::fb, 5353) via [socket 8 (('::', 5353, 0, 0))] (36 bytes #1) \u003cDNSOutgoing:multicast=True, flags=0, questions=[ptr[question,QM,in,_matter._tcp.local.]], answers=[], authorities=[], additionals=[]\u003e as b'\\x00\\x00\\x00\\x00\\x00\\x01\\x00\\x00\\x00\\x00\\x00\\x00\\x07_matter\\x04_tcp\\x05local\\x00\\x00\\x0c\\x00\\x01'...\n2025-04-10 16:17:46,782 Error with socket 8 (('::', 5353, 0, 0))): [Errno 99] Cannot assign requested address\nTraceback (most recent call last):\n  File \"/usr/lib/python3.13/asyncio/selector_events.py\", line 1268, in sendto\n    self._sock.sendto(data, addr)\n    ~~~~~~~~~~~~~~~~~^^^^^^^^^^^^\nOSError: [Errno 99] Cannot assign requested address\n```\n\n","author":{"url":"https://github.com/agners","@type":"Person","name":"agners"},"datePublished":"2025-04-10T14:22:56.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":5},"url":"https://github.com/1562/python-zeroconf/issues/1562"}