[ubuntu] keep dhclient running after "No DHCPOFFERS received"

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http://ubuntuforums.org – I use dhcp in /etc/network/interfaces: auto eth0 iface eth0 inet dhcp No network-manager installed. This makes the dhclient run with option "-1":dhclient3 -e IF_METRIC=100 -pf /var/run/dhclient.eth0.pid -lf /var/lib/dhcp/dhclient.eth0.leases -1 eth0 dhclient manpage: The -1 flag will cause dhclient to try once to get a lease. If it fails, dhclient exits with exit code two.When the dhcpd server is not reachable, the client exits after "No DHCPOFFERS received". I want the dhclient keep running to get a new ip address when the dhcpd server is reachable ag (Hardware)