Configure #DirectAccess for Mobile Broadband

Last week I noticed some problems with DirectAccess by using UMTS/3G broadband network of a Dutch mobile provider (KPN). A number of IPv6 translation methods don’t work by default which results DirectAccess by broadband is not always guaranteed. Table below shows a comparison of the various telecom providers and supported IPv6 translation methods.

IPv6 Translation ISP Provider support matrix

Provider 6to4 Teredo IP-HTTPS
KPN (UMTS) X(1) X(2)
Vodafone (UMTS)
FRITZ (ADSL) n/a
  1. Teredo traffic—UDP destination port 3544 inbound and UDP source port 3544 outbound.
  2. 6to4 traffic—Protocol 41 inbound and outbound

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