[Bug 1745540] Re: Ubuntu 17.10 - DNS query via TCP not working

[Steve Langasek]

** Package changed: resolvconf (Ubuntu) => dnscrypt-proxy (Ubuntu)

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Title:
  Ubuntu 17.10 - DNS query via TCP not working

Status in dnscrypt-proxy package in Ubuntu:
  New

Bug description:
  TL:DR seem's like "ping/wget" etc become dislike truncated UDP DNS reply and the become tell "Temporary failure in name resolution" instead fallback to TCP protocol...
   


  
  https://github.com/DNSCrypt/dnscrypt-proxy/issues/2

  I'm using DNSCrypt-proxy running at 127.0.2.1:53

  me at nb:~$ cat /etc/resolv.conf 
  nameserver 127.0.2.1

  
  me at nb:~$ nslookup ya.ru
  Server:     127.0.2.1
  Address:    127.0.2.1#53

  Non-authoritative answer:
  Name:   ya.ru
  Address: 87.250.250.242

  me at nb:~$ ping ya.ru
  PING ya.ru (87.250.250.242) 56(84) bytes of data.
  64 bytes from ya.ru (87.250.250.242): icmp_seq=1 ttl=50 time=31.3 ms
  ^C
  --- ya.ru ping statistics ---
  1 packets transmitted, 1 received, 0% packet loss, time 0ms
  rtt min/avg/max/mdev = 31.320/31.320/31.320/0.000 ms

  now I'm setting TCPOnly on into /etc/dnscrypt-proxy/dnscrypt-
  proxy.conf

  me at nb:~$ sudo service dnscrypt-proxy restart
  me at nb:~$ nslookup ya.ru
  ;; Truncated, retrying in TCP mode.
  Server:     127.0.2.1
  Address:    127.0.2.1#53

  Non-authoritative answer:
  Name:   ya.ru
  Address: 87.250.250.242

  me at nb:~$ ping ya.ru
  ping: ya.ru: Temporary failure in name resolution

  Is it possible to serve DNS over UDP but communicate between DNSCrypt
  proxy and DNSCrypt server over TCP?

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