Issue #15628 has been updated by hsbt (Hiroshi SHIBATA). Status changed from Assigned to Closed Closing in favor of https://bugs.ruby-lang.org/issues/20108 ---------------------------------------- Feature #15628: init_inetsock_internal should fallback to IPv4 if IPv6 is unreachable https://bugs.ruby-lang.org/issues/15628#change-107588 * Author: sonalkr132 (Aditya Prakash) * Status: Closed * Assignee: Glass_saga (Masaki Matsushita) ---------------------------------------- Hi, This is not really bug but more of a missing feature. Let me layout steps to reproduce what I am trying to achieve: * Add local entries for `example.com` ``` $ echo "::1 example.com www.example.com 127.0.0.1 example.com www.example.com" | sudo tee --append /etc/hosts ``` * Add rule to `DROP` ipv6 packets: `sudo ip6tables -P INPUT DROP` * Start a server: `ruby -rwebrick -e 'WEBrick::HTTPServer.new(Port: 8000).start'` * Making request using Net:HTTP with timeout (`Net::OpenTimeout`) after after 60 seconds: `ruby -rnet/http -e "Net::HTTP.get(URI('http://example.com:8000'))"` As far as I understand, [init_inetsock_internal](https://github.com/ruby/ruby/blob/4444025d16ae1a586eee6a0ac9bdd09e33833f3c/e...) needs to fallback to ipv4 for Net::HTTP.get to work. IPv6 route being broke is expected and hence, [RFC8305](https://tools.ietf.org/html/rfc8305) recommends fallback to IPv4. Support for IPv6 fallback is spotty across languages and http clients, for example, [golang supports it](https://github.com/golang/go/blob/master/src/net/dial.go#L47) but python doesn't, making request with `curl` works but `wget` hangs. -- https://bugs.ruby-lang.org/