Hi, The lack of answer suggested nobody was familiar enough with avahi-autoipd, so I am giving more details.
According to the manpage, avahi-autoipd is an implementation of https://tools.ietf.org/html/rfc3927.html. To achieve autoconfiguration of their ip address, hosts randomly select an address "in the range from 169.254.1.0 to 169.254.254.255 inclusive" (section 2.1), then "test to see if the IPv4 Link-Local address is already in use" (section 2.2) by "broadcasting an ARP Request for the desired address" (section 2.2.1). The document also says that for this to work, "a broadcast sent [...] by any host from that set of hosts can be received by every other host" (section 1.2) So the first question would be: any chance wireguard can broadcast ARP request? Now for my question about resolving ".local" hosts, the concept is called mDNS and maps to https://tools.ietf.org/html/rfc6762. The protocol is summarized as "Clients performing DNS-like queries for DNS-like resource records by sending DNS-like UDP query and response messages over IP Multicast to UDP port 5353". The general idea is that "Any DNS query for a name ending with ".local." MUST be sent to the mDNS IPv4 link-local multicast address 224.0.0.251 (or its IPv6 equivalent FF02::FB)" (section 3). So the second question is about whether wireguard supports broadcasting udp packets to 224.0.0.251 or the ipv6 equivalent ff02::fb (I don't know why the RFC used capital letters). Digging in the mailing list, I found a thread from end of 2016 https://lists.zx2c4.com/pipermail/wireguard/2016-December/000811.html stating that this was currently not possible. Then, there is this answer https://lists.zx2c4.com/pipermail/wireguard/2016-December/000813.html which says that "It's not complicated in theory, but I wonder if this would be genuinely useful". I would like to say that the decentralized nature of wireguard would make it ideal for combining it with decentralized protocols such as avahi-autoipd or mDNS, so please support this! Best, Christophe-Marie _______________________________________________ WireGuard mailing list WireGuard@lists.zx2c4.com https://lists.zx2c4.com/mailman/listinfo/wireguard
