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Microsoft DirectAccess Best Practices and Troubleshooting by Jordan Krause

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No ISATAP with multisite DirectAccess

If you remember back a few pages, we talked about Windows preferring IPv6 over IPv4 whenever v6 is available. That, combined with the fact that an internal computer's ISATAP connection essentially default-routes all IPv6 traffic to its ISATAP router (the DirectAccess server) all the time, means that ISATAP and multisite DirectAccess don't really work together. If you had multiple DirectAccess entry points, each one of them running as an ISATAP router, your internal servers or PCs that you intend to join to the ISATAP network can only point one place. So they are going to hit either Site A or Site B, not both. This means that their responses to the client machines are always going to go out whichever site they ...

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