Local DNS For mac..

In disconnected state macOS doesnot make dns requests.. so we need to make a tap device assign it an ip so that it thinks it is still connected to something,
after that the resolver file inside /etc/resolver/nip.io will be used for the resolving so we only need to ccreate a tap device and that's it.

1. Install the `tuntap` package from brew
2. Create a network service using the tap device.. need to edit the file in /Library/Preferences/SystemConfiguration/preferences.plist
add the following snippet to that file, under _NetworkServices_ key need to generate a uuid (`uuidgen`)
```
<key>D16F22CE-6DDE-4E63-837C-E16538EA5CCB</key> <-- uuid
		<dict>
			<key>DNS</key>
			<dict/>
			<key>IPv4</key>
			<dict>
				<key>Addresses</key>
				<array>
					<string>10.10.90.1</string>
				</array>
				<key>ConfigMethod</key>
				<string>Manual</string>
				<key>SubnetMasks</key>
				<array>
					<string>255.255.0.0</string>
				</array>
			</dict>
			<key>IPv6</key>
			<dict>
				<key>ConfigMethod</key>
				<string>Automatic</string>
			</dict>
			<key>Interface</key>
			<dict>
				<key>DeviceName</key>
				<string>tap0</string>
				<key>Hardware</key>
				<string>Ethernet</string>
				<key>Type</key>
				<string>Ethernet</string>
				<key>UserDefinedName</key>
				<string>MiniTap</string>
			</dict>
			<key>Proxies</key>
			<dict>
				<key>ExceptionsList</key>
				<array>
					<string>*.local</string>
					<string>169.254/16</string>
				</array>
				<key>FTPPassive</key>
				<integer>1</integer>
			</dict>
			<key>SMB</key>
			<dict/>
			<key>UserDefinedName</key>
			<string>MiniTap</string>
		</dict>
	</dict>
```

now we need to make two more entries in that file, one to the list of service order.. look for the key _Sets_ and under that look for the key _ServiceOrder_ 
add the uuid for MiniTap there..

next entry looks like the following and goes under the _Service_ key, (replace the uuid with the generated one)

```
        <dict>
						<key>__LINK__</key>
						<string>/NetworkServices/D16F22CE-6DDE-4E63-837C-E16538EA5CCB</string>
				</dict>
 ```

run the following commands.. as root (assiging ip to the tap device and turn it on) 

exec 4<>/dev/tap0 <-- this opens and closes the device i guess..
ifconfig tap0 10.10.90.1 255.255.0.0
ifconfig tap0 up

now set the same ip address for the MiniTap interface from the network preferences gui..

and it should work..