DHCPでDNSの自動設定を抑止する

/etc/dhcp/dhclient.confの中のrequire domain-name-serversを削除する

interface "eth0" {
    #prepend domain-name-servers 127.0.0.1;
    request subnet-mask, broadcast-address, time-offset, routers,
            host-name;
    #        domain-name, domain-name-servers, host-name;
    #require subnet-mask, domain-name-servers;
    require subnet-mask;
}