# Force ansible to use IPv4 / IPv6? **URL:** \ **Category:** Ansible Project\ **Created:** [January 13, 2015, 12:04am UTC](https://forum.ansible.com/t/force-ansible-to-use-ipv4-ipv6/17244 "2015-01-13T00:04:52Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![John\_Oliver](https://avatars.discourse-cdn.com/v4/letter/j/97f17d/32.png) [@John\_Oliver](https://forum.ansible.com/u/John_Oliver)\ **Post date:** [January 13, 2015, 12:04am UTC](https://forum.ansible.com/t/force-ansible-to-use-ipv4-ipv6/17244/1 "2015-01-13T00:04:52Z")
I’ve run into a minor problem where one of my hosts has an AAAA record for an address assigned via DHCP6, but it isn’t acquiring that address. I can connect via the IPv4 address just fine. I’m looking for a switch to tell ansible / ansible-playbook to force a connection over one protocol so I don’t have to come up with some lower-level hack, forget about it, and have it cause another problem tomorrow 🙂 ---
**Author:** ![Greg\_Andrews](https://avatars.discourse-cdn.com/v4/letter/g/6bbea6/32.png) [@Greg\_Andrews](https://forum.ansible.com/u/Greg_Andrews)\ **Post date:** [January 13, 2015, 2:42am UTC](https://forum.ansible.com/t/force-ansible-to-use-ipv4-ipv6/17244/2 "2015-01-13T02:42:46Z")
Off the top of my head: 1. Do the IPv4 and IPv6 addresses have different hostnames in DNS? If so, use the hostname for the address that’s usable. 2. In the ansible machine’s .ssh/config file, you can enter something like this: HOST problem-hostname AddressFamily inet According to my man page for ssh\_config, “inet” is IPv4 and “inet6” is IPv6. -Greg ---
**Author:** ![Tom\_Bamford](https://avatars.discourse-cdn.com/v4/letter/t/c2a13f/32.png) [@Tom\_Bamford](https://forum.ansible.com/u/Tom_Bamford)\ **Post date:** [January 13, 2015, 7:48am UTC](https://forum.ansible.com/t/force-ansible-to-use-ipv4-ipv6/17244/3 "2015-01-13T07:48:54Z")
Should be able to do this with ssh-config. Don’t forget to tell your client to fix their brain-dead DNS! 🙂