# option('dns-servers', type : 'string',
# description : 'space-separated list of default DNS servers',
# value : '8.8.8.8 8.8.4.4 2001:4860:4860::8888 2001:4860:4860::8844')
# option('dns-servers', type : 'string',
# description : 'space-separated list of default DNS servers',
# value : '8.8.8.8 8.8.4.4 2001:4860:4860::8888 2001:4860:4860::8844')