Continue without a default route?

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http://askubuntu.com – I have to do a complete unattended installation of a node with Ubuntu12.04. I have given following options in preseed file d-i netcfg/choose_interface select eth0 d-i netcfg/disable_dhcp boolean true d-i netcfg/dhcp_failed note d-i netcfg/dhcp_options select Configure network manually d-i netcfg/disable_autoconfig boolean true d-i netcfg/use_autoconfig boolean false d-i netcfg/network-manager boolean false d-i netcfg/no_default_route boolean true d-i netcfg/enable boolean true d-i netcfg/get_ipaddress string d-i netcfg/get_netmask string d-i netcfg/Confirm_static b (HowTos)