ifconfig epair0b vnet jail - not found/Invalid argument

My system is a FreeBSD 9.1-RELEASE. I created a jail with ezjail 'mldonkey'.

I'm trying to set up a bridge between the host and the jail, following this site.

But I cannot configure epair0b:

# ifconfig epair0b create vnet 3
Code:
ifconfig: SIOCSIFVNET: Invalid argument

# ifconfig epair0b vnet mldonkey
Code:
ifconfig: jail "mldonkey" not found

I don't know if I missed some configuration, as ezjail didn't write anything to /etc/jails. I don't even have that directory, although there's a /usr/local/etc/ezjail.

Am I missing some configuration? What should I do?
 
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