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    Change DNS servers, wifi and mobile data

    Scheduled Pinned Locked Moved Support
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      • Br1B Offline
        Br1
        last edited by

        ---- UPDATE OTA-2 Focal ----
        ---- Stable Channel ----

        Usual three steps :

        1 - download (just tap) setdns-ota.2 from here

        2 - open file manager, go to Downloads, tap setdns-ota.2.tar.gz and tap extract archive

        3 - open terminal, type :

        sudo Downloads/setdns-ota.2/setdns-ota.2.sh

        and hit enter,

        type 1 + enter to set Cloudflare servers
        type 2 + enter to set OpenDNS servers
        type 3 + enter to set custom servers (*)
        type 4 + enter to restore default settings (Restore OS)
        type 5 + enter to exit (OS unchanged)

        Remember to "Restore OS" before the next OTA update !

        set-dns is one single script, preview :

        #!/bin/bash

# Make sure only root can run this script
if [ "$(id -u)" != "0" ]; then
   echo " - You must prepend 'sudo' !" 1>&2
   exit 1
fi

echo -e '\n- Set DNS servers / Restore default -\n' ;

rsv_cnf=/etc/resolv.conf ;

# these are Cloudflare's DNS servers
CLF_one=1.1.1.1
CLF_two=1.0.0.1

# these are OpenDNS servers
OPE_one=208.67.222.222
OPE_two=208.67.220.220

PS3='
Please enter your choice : '
options=("  Cloudflare  -      " "  OpenDNS     -      " "  Custom DNS  -      " "  Restore OS  -      " "  Quit        -      ")
select opt in "${options[@]}"
do
	case $opt in
	"  Cloudflare  -      ")
		# check resolv.conf
		if [ ! -L $rsv_cnf ] ;

		then

			# -------------------- runs if resolv.conf is a file --------------------

			# mount root in read/write mode
			mount -o remount,rw / ;

			# add it Cloudflare servers
			echo -e "# Cloudflare servers" > $rsv_cnf ; echo -e "nameserver $CLF_one" >> $rsv_cnf ; echo -e "nameserver $CLF_two" >> $rsv_cnf ;

			# remount root in read only mode
			mount -o remount,ro / ;

			echo -e '\n Cloudflare DNS are set up !\n'

			exit 0

		else

			# -------------------- runs if resolv.conf is a symbolic link --------------------

			# mount root in read/write mode
			mount -o remount,rw / ;

			# delete symbolic link
			rm /etc/resolv.conf ;

			# create file
			touch /etc/resolv.conf ;

			# add it Cloudflare servers
			echo -e "# Cloudflare servers" > $rsv_cnf ; echo -e "nameserver $CLF_one" >> $rsv_cnf ; echo -e "nameserver $CLF_two" >> $rsv_cnf ;

                       # remount root in read only mode
                        mount -o remount,ro / ;

			echo -e '\n Cloudflare DNS are set up !\n'

			exit 0

		fi

		;;

	"  OpenDNS     -      ")
		# check resolv.conf
		if [ ! -L $rsv_cnf ] ;

		then

			# -------------------- runs if resolv.conf is a file --------------------

			# mount root in read/write mode
			mount -o remount,rw / ;

			# add it Cloudflare servers
			echo -e "# OpenDNS servers" > $rsv_cnf ; echo -e "nameserver $OPE_one" >> $rsv_cnf ; echo -e "nameserver $OPE_two" >> $rsv_cnf ;

			# remount root in read only mode
			mount -o remount,ro / ;

			echo -e '\n OpenDNS servers are set up !\n'

			exit 0

		else

			# -------------------- runs if resolv.conf is a symbolic link --------------------

			# mount root in read/write mode
			mount -o remount,rw / ;

			# delete symbolic link
			rm /etc/resolv.conf ;

			# create file
			touch /etc/resolv.conf ;

			# add it Cloudflare servers
			echo -e "# OpenDNS servers" > $rsv_cnf ; echo -e "nameserver $OPE_one" >> $rsv_cnf ; echo -e "nameserver $OPE_two" >> $rsv_cnf ;

                       # remount root in read only mode
                        mount -o remount,ro / ;

			echo -e '\n OpenDNS servers are set up !\n'

			exit 0

		fi

		;;

	"  Custom DNS  -      ")
		# check resolv.conf
		if [ ! -L $rsv_cnf ] ;

		then

			# -------------------- runs if resolv.conf is a file -------------------- 

			# mount root in read/write mode
			mount -o remount,rw / ;

			echo -e "# Custom DNS servers" > $rsv_cnf ; 

                                        read -p " Type primary server : " priDN

					echo -e "nameserver $priDN" >> $rsv_cnf ;

					read -p " Type secondary server : " secDN

					echo -e "nameserver $secDN" >> $rsv_cnf ;

			# remount root in read only mode
			mount -o remount,ro / ;

			echo -e '\n Custom DNS are set up !\n'

			exit 0

		else

			# -------------------- runs if resolv.conf is a symbolic link --------------------

			# mount root in read/write mode
			mount -o remount,rw / ;

			# delete symbolic link
			rm /etc/resolv.conf ;

			# create file
			touch /etc/resolv.conf ;

			echo -e "# Custom DNS servers" > $rsv_cnf ;

                                        read -p " Type primary server : " priDN

                                        echo -e "nameserver $priDN" >> $rsv_cnf ;

                                        read -p " Type secondary server : " secDN

                                        echo -e "nameserver $secDN" >> $rsv_cnf ;

                       # remount root in read only mode
                        mount -o remount,ro / ;

			echo -e '\n Custom DNS are set up !\n'

			exit 0

		fi

		;;

	"  Restore OS  -      ")
			# mount root in read/write mode
			mount -o remount,rw / ;

			# delete file
			rm /etc/resolv.conf ;

			# recreate symbolic link
			ln -s /run/systemd/resolve/stub-resolv.conf /etc/resolv.conf ;

                       # remount root in read only mode
                        mount -o remount,ro / ;

			echo -e '\n Default settings have been Restored !\n'

			exit 0

		;;
        "  Quit        -      ")
			echo -e '\n  - OS unchanged !\n'

			break
		;;
			*) echo "invalid option $REPLY"
		;;
    esac
done

        (*) For example, if you want to set Google DNS servers enter 8.8.8.8 as primary server and 8.8.4.4 as secondary server.

        ^

        • Google Pixel 3a XL
        • Xiaomi MI A2
        D 1 Reply Last reply Reply Quote 2
        • D Offline
          domubpkm @Br1
          last edited by

          @Br1 Hello. is your OTA-2 work / procedure the same for OTA-3 ? Thanks again

          1 Reply Last reply Reply Quote 0
          • Br1B Offline
            Br1
            last edited by Br1

            I can’t test ota 3 update, install at your own risk (*)

            ^

            • Google Pixel 3a XL
            • Xiaomi MI A2
            1 Reply Last reply Reply Quote 0
            • Br1B Offline
              Br1
              last edited by

              OTA 3 Stable channel --- You can reinstall, no changes are necessary.

              ^

              • Google Pixel 3a XL
              • Xiaomi MI A2
              D 1 Reply Last reply Reply Quote 1
              • D Offline
                domubpkm @Br1
                last edited by

                @Br1 Done, it works as expected.

                1 Reply Last reply Reply Quote 0
                • D Offline
                  domubpkm
                  last edited by

                  @Br1 I am on RC test OTA-4, it seems ok for me.

                  1 Reply Last reply Reply Quote 0
                  • D Offline
                    domubpkm
                    last edited by domubpkm

                    @Br1

                    New tests.

                    I noted this:
                    . Sometimes a reboot is necessary to get my carrier's DNS fully restored if I no longer want to use cloudflare dns. Just using the 'restore' option in the script is not enough.

                    . When using cloudflare, in the list of cloudflare DNS servers, some are in the USA (Missouri). Is this normal ? Shouldn't cloudflare DNS all stay in its country of origin like I see with Firefox (all in France for me) ?

                    Thank you to enlighten me.

                    Br1B 1 Reply Last reply Reply Quote 0
                    • Br1B Offline
                      Br1 @domubpkm
                      last edited by

                      @domubpkm said in Change DNS servers, wifi and mobile data:

                      Sometimes a reboot is necessary to get my carrier's DNS fully restored

                      It could be caused by dns cache, after restoring try this :

                      sudo resolvectl flush-caches

                      if it works, I can add it to next version

                      @domubpkm said in Change DNS servers, wifi and mobile data:

                      Shouldn't cloudflare DNS all stay in its country of origin

                      servers in 120+ countries ... I don’t know what criteria they use

                      ^

                      • Google Pixel 3a XL
                      • Xiaomi MI A2
                      D 1 Reply Last reply Reply Quote 0
                      • D Offline
                        domubpkm @Br1
                        last edited by

                        @Br1 said in Change DNS servers, wifi and mobile data:

                        It could be caused by dns cache, after restoring try this :

                        sudo resolvectl flush-caches

                        Sorry, i can't confirm it works for me. A reboot is yet necessary.

                        @Br1 said in Change DNS servers, wifi and mobile data:

                        Shouldn't cloudflare DNS all stay in its country of origin

                        servers in 120+ countries ... I don’t know what criteria they use

                        When i did my precedent feedback, i was in RC TEST OTA-4. Now i am on 'real' OTA-4 and all cloudfare DNS are in my country. So for this, it's solved. 🤔 🙂

                        1 Reply Last reply Reply Quote 0
                        • Br1B Offline
                          Br1
                          last edited by

                          --- New version (only an optimization) here, as reported by @domubpkm to restore the original dns servers reboot is required (added message).

                          ^

                          • Google Pixel 3a XL
                          • Xiaomi MI A2
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