If your 360 is giving the ICMP error then you will have to wait for the next firmware update.
I had major issues with the 360 and the hub 3 and never did find a way around it but since my hub 3 has the newer firmware (currently under test) my 360 now works fine. the same firmware also will fix the chrome cast issues. (Only option at this time is to request a SH2AC until the firmware is released).
200Mb(SH2 SH2AC Hub 3.0), 2 X V6 TV XL, Phone M. 100Mb Business (Hitron Hub).