The IP address range 203.122.250.128/29 Has been assigned to you.



The IP address of the  router at this end of the GRE tunnel is
203.16.215.227.



a sample config for a cisco router to setup the tunnel is listed below:



interface Tunnel0 

 description --- ADSL Tunnel to Internode --- 

 bandwidth 1536 

 ip unnumbered {tunnel interface}

 ip mtu 1500 

 tunnel source {tunnel interface}

 tunnel destination 203.16.215.227