Problem with jail network

[bsd]

Hi, 

I have been configuring a jail system using the howto provided here : http://www.freebsd.org/doc/handbook/jails-application.html

The is now correctly starting, but I can't seem to use the network stack. 


> root at master 16:52:55 ~ -> jls
> JID  IP Address      Hostname                      Path
>   1  xx.216.yy.150  n0.no.no                    /jail/j/n0


But I can't ping neither outside of the jail, nor inside of It. 

I am a bit confused because I don't know if I have to configure the IP using an alias on the main Eth interface, or do something else. 

> ifconfig_bce0_alias0="inetxx.216.yy.150/32"



This last command seems to have frozen my system. 


Since I can't reach the network, I can't install ports either… ! 


Thanks for your help. 


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