BSD Jails can't be joined by external host

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http://serverfault.com – I have some difficulties to start 2 jails on the same host. When the first jail is running, i can access this jail by ssh and http (this jail running nginx). But when i start the second jails, i lost first jail connection and i can't join the jail from ext. and i have a message like arp: xx:xx:xx:xx:xx:xx attempts to modify permanent entry for on em0 how i can have 2 or mort jails with different IP. (host:, jail01:, jail02:, ...) ie: root@bsd-9> /etc/rc.d/jail start romulus root@bsd-9> /etc/rc.d/jail start remus user@ext-linux (HowTos)