I use T-Mobile in the US and the same gprs access point name is used for IPv6 or IPv4, but dual-stack is not supported. I installed this package but seems I cannot add a second gprs connection via the settings UI, nor specify whether the existing connection should use IPv4 or IPv6. Is this possible? That way I could explicitly connect to IPv4 or IPv6.

BTW I can use the package at https://code.google.com/p/n900ipv6/ to do this but I deleted settings and removed it prior to testing your ipv6 package so there should be no interference.

Also, for case of IPv6-only, some implementation of nat64/xlat/clat/whatever you call it, will be useful for applications who don't support IPv6 or for programs connecting to IPv4 literal addresses. Again there is a nat64d package at https://code.google.com/p/n900ipv6/ but its implementation has an obsolete T-Mobile US route hardcoded and does not autoconfigure. It has been ported to Android and looks like more improvements have been made there, don't know if it would be possible to backport them to the N900 version.

Thanks!