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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"IPv6 does not work with link-local addresses","articleBody":"The IPv6 implementation does work with \"::1\" but not with link-local addresses. For this to work I have replaced some lines in the client:\n\n    def _connect(self):\n        \"\"\"Helper to establish socket communication\"\"\"\n\n        ipv6 = type(ipaddress.ip_address(self._ecu_ip_address)) == ipaddress.IPv6Address\n\n        self._tcp_sock = socket.socket(self._address_family, socket.SOCK_STREAM)\n        self._tcp_sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, True)\n        self._tcp_sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, True)\n        if self._client_ip_address is not None:\n            if ipv6:\n                ip_address, scope_id = self._client_ip_address.split(\"%\")\n                interface_index = socket.if_nametoindex(scope_id)\n                self._tcp_sock.bind((ip_address, 0, 0, interface_index))\n            else:\n                self._tcp_sock.bind((self._client_ip_address, 0))\n\nThis works for me when called with a \"...%...\" address (same for UDP port), I'm not an expert on IPv6 though.","author":{"url":"https://github.com/maspiess","@type":"Person","name":"maspiess"},"datePublished":"2025-07-28T14:26:55.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/61/python-doipclient/issues/61"}