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By default (fresh installation) of Windows Server 2012 R2, I saw that there are several windows firewall rules which contains ICMPv6-In and ICMPv6-Out.

Is it ok for us to turn off these firewall rules if we don't use IPv6?

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You should really have IPv6 enabled and firewall on to be honest.

Here's a short article about it. I'm also not sure what you mean by "Don't use it".

  1. "Don't use it" - it will still be enabled just not used and you should have some security on it.
  2. "Have unchecked the IPv6 box" - It is still not fully disabled and you should have some security on it. Also there are a lot of articles on why not to do this.
  3. "Have cleared it from the registry" - Fair play, not recommended but I suppose if it's completely cleared then there's no danger of receiving traffic on it and so in my eyes you could disable those rules, but I also see no major downside to leaving them enabled -just-in-case-.

Hope this is of some help!

  • By "Don't use it', I mean I don't really have the need for IPv6 and not applying it to any of our application or nginx. By the way, thanks for the article. I think it will be best leave it on – Toan Lu Nov 28 '17 at 11:10

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