From a docker container when I try to curl 'another container name', curl first tries to resolve the name to IPv6. This causes few seconds delay because the web server is not reachable over ipv6.

I removed the link local address on the container interface and also disabled ipv6 on the container's lo and eth0 interface. curl still tries to resolve the name to IPv6 first (unless its forced via curl -4).

This seems wrong. Why does curl try to resolve the name to ipv6 even if ipv6 is disabled ?

  • 1
    How is IPv6 disabled, in particular? Otherwise, --ipv4 is a relevant flag to curl in that situation. – thrig Feb 24 '16 at 23:41
  • I removed v6 addresses from /etc/hosts and did the following.. sysctl -w net.ipv6.conf.all.autoconf=0, sysctl -w net.ipv6.conf.default.accept_ra=0, sysctl -w net.ipv6.conf.all.disable_ipv6=1 – Manohar Feb 24 '16 at 23:52

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