17

(My phone is rooted and runs Android 5.1)

How can one change the DNS addresses of mobile data (and persistently, if possible) without the requirement of an app?

14

I did not find a way to reliably do it without an app.

I often use OpenDNS Family Shield, but sometimes it blocks me to visit some particular hacking site and then I need to quickly and easily change the DNS servers.

I used to use Set DNS but it stopped to work in Android 4.3 and further, so I created Override DNS, a new app which mimics Set DNS' behaviour, but it's updated to work even in Lollipop. It has some other nice feature like a PIN protection ad a Wi-Fi SSID filter, too.

The only way I can see to do it without an app is something like an iptables rule to redirect any traffic going to udp/53 to some other ip. A similar procedure is shown in a XDA thread.

I paste here the iptables rules for completeness (I did not tested them)

$IPTABLES -t nat -D OUTPUT -p tcp --dport 53 -j DNAT --to-destination 208.67.222.222:53 || true
$IPTABLES -t nat -D OUTPUT -p udp --dport 53 -j DNAT --to-destination 208.67.222.222:53 || true
$IPTABLES -t nat -I OUTPUT -p tcp --dport 53 -j DNAT --to-destination 208.67.222.222:53
$IPTABLES -t nat -I OUTPUT -p udp --dport 53 -j DNAT --to-destination 208.67.222.222:53

Everything directed from the Android device to any IP, port UDP and TCP 53 is redirected to 208.67.222.222 which is one of OpenDNS' DNS server.

These commands should be placed in a script which is run at every device boot. That functionality depends on your specific ROM. I don't know if something similar can be done in a stock ROM without using an app. Override DNS solves this problem, too.

  • The trait I liked here is that other than showing off the features of your app (which a lot of developers/marketers I've seen doing it here), you focused directly on the question, and tried to provide an alternative for your app itself. Good! – Firelord Aug 3 '15 at 11:15
  • 2
    @Firelord yes... shameless plug, but with some style :) – MaxChinni Aug 3 '15 at 14:00
  • I attempt to use these settings but I get "Bad IP Address" error. I am attempting to use the Google DNS 8.8.8.8 and 8.8.4.4 – Kristopher Apr 5 '16 at 20:38
  • Many apps claim to give the same capability without root. Is there some "catch" to those apps? – Michael Crenshaw Apr 13 '18 at 14:48
  • @mac9416 I'm not aware of any particular behaviour related to those apps (they all create a faux local VPN), but the original question was about achieving it without any specific app, so I think we're going OT. – MaxChinni Apr 13 '18 at 21:43
3

This info is from 2014. But it might still work. I am not in the position to test it at the moment, but since you are rooted. You could try adding the dns settings to the build.prop file and see if it sticks. Adding the following to the build.prop file should add google as your DNS server.

net.rmnet0.dns1=8.8.8.8
net.rmnet0.dns2=8.8.4.4
net.dns1=8.8.8.8
net.dns2=8.8.4.4

Taken from this post on the Nexus 5 forums over on XDA. That post can be found here. Item number 21 is the DNS settings.

  • I tried this for fun on my Lenovo P2 running Android 7.0 and it did not work – user1151923 Aug 6 at 13:55
1

That's not possible without an app, it has to be with an app. Second, you need root access in able to change 1G/2G/3G/4G DNS. Try Set DNS.

  • "That's not possible without an app, it has to be with an app" -- any good reason? – Firelord Aug 2 '15 at 22:15
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    Cuz android does not support it by default so that's why you need a special app to mess with it – user119443 Aug 2 '15 at 22:16
  • 3
    Android does support build.prop editing, you just need a file manager with root access. – Dan Brown Aug 3 '15 at 0:21
  • @DanB +1, Was about to comment on this saying that. See my answer for the build.prop method. If interested. – jer3my Aug 3 '15 at 0:26
  • @jer3my Great minds think alike? I'll look at your answer :) – Dan Brown Aug 3 '15 at 8:15
1

Starting with Android 9 Pie it is possible to change DNS globally, provided they support TLS. Just go in

Settings → Network & internet → Advanced → Private DNS

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