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    Change DNS servers, wifi and mobile data

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      • Br1B Offline
        Br1 @domubpkm
        last edited by

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

        @Br1 typo error

        fixed, thank you.

        ^

        • Google Pixel 3a XL
        • Xiaomi MI A2
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        • D Offline
          domubpkm @Br1
          last edited by domubpkm

          This post is deleted!
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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
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            • 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
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                • Br1B Offline
                  Br1
                  last edited by

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

                  ^

                  • Google Pixel 3a XL
                  • Xiaomi MI A2
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                  • 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
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                          • 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. 🤔 🙂

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                            • 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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