OK, thanks for the explanation. For now I consider it unusable because of the icd2 bugs, so I will uninstall, but I'm happy to test again if there's any update.

My wifi IPv6 uses radvd-based autoconfig (not DHCPv6) so that explains why I've been able to use wifi ipv6 successfully without this package.

I don't know if I fully understand the role of icd2, but if this version cannot be used reliably, maybe we can find a workaround by putting dhcpv6 commands in the if-up scripts or something... I do not have access to a dhcpv6 wifi network so I've never researched it, probably there are already ways to accomplish this.

With regard to the gprs packages I linked, they are hardcoded by default for t-mobile USA, so probably not appropriate to include in the metapackage at this time unless some new maintainer can adopt them and make them more generic.

D@vIcHoJD, instead of reboot try to run these commands in a root shell:
That will restart icd2 without rebooting the whole device (warning: open network connection will be killed when you stop icd2)