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ISA Server and IPv6

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ISA Server does not handle IPv6 traffic. IPv6 traffic will pass through the ISA Server firewall regardless of your firewall policy. We recommend that you not enable IPv6 traffic on the ISA Server computer or array. If you have enabled IPv6 traffic, we recommend that you disable it on the ISA Server computer, or on each member of the ISA Server array.

To disable the IPv6 stack, on the ISA Server computer or array member, type the following at a command prompt:

netsh interface ipv6 uninstall

Alternatively, you can disable the IPv6 stack in the Windows user interface:

  1. On the ISA Server computer or array member, from the Start menu, point to Settings and select Control Panel.
  2. In the control panel, double-click Network Connections.
  3. Double-click a network connection that is associated with a network adapter, and click Properties.
  4. On the General tab, from the list box, select Microsoft TCP/IP version 6, and then click Uninstall. In the warning dialog box, click Yes to proceed.
  5. Click OK to close the network connection properties.
  6. Restart the ISA Server computer or array member.

Note: You only have to perform this procedure on one network connection on the ISA Server computer (Standard Edition) or on one network connection on each ISA Server array member (Enterprise Edition).

Nathan Bigman
ISA Server User Education

Comments

  • Anonymous
    January 01, 2003
    PingBack from http://www.keyongtech.com/1228055-ip-v6-for-isa-server

  • Anonymous
    April 27, 2006
    Nathan,

    The question on mailing lists is usually if a PC on the network has v.6 installed and ISA does not, does ISA pass the traffic through or prevent it?

  • Anonymous
    April 29, 2006
    Hi,

    But ISA RTM will work if ipv6?

    bye

  • Anonymous
    April 30, 2006
    If a PC on the network has v.6 installed, and ISA has it disabled, the traffic will not pass through ISA.

    ISA Server 2006 will not handle IPv6 in the RTM version, so the advice provided applies to that version, as well as previous versions of ISA Server.

    Nathan Bigman
    ISA Server User Education

  • Anonymous
    March 17, 2011
    The PC on the network may build a IPv6 tunnel such as a 6-to-4 to the anycast address 192.88.99.1 and the first hop for that PC would be the IPv6 address of that anycast server. This is exactly same concept as a VPN tunnel. HTH