You can't. Go6/Gogo/Hexago/Freenet6 (name of the day) uses TSP (Tunnel Setup Protocol) for configuration and tunnelling, while SixXS uses TIC (Tunnel Information and Control Protocol) for configuration and either plain 6in4, 6in4-heartbeat or AYIYA for tunnelling depending what is best for the situation. For SixXS one either can use AICCU or one of the NAT-box/CPE/routers that supports TIC and one of the tunnelling protocols. AVM, Draytek, Motorola are amongst those and so many open source solutions like OpenWRT, pfSense etc.