Change DNS servers, wifi and mobile data
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---- 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.shand 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.
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@Br1 Hello. is your OTA-2 work / procedure the same for OTA-3 ? Thanks again
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I can’t test ota 3 update, install at your own risk (*) -
OTA 3 Stable channel --- You can reinstall, no changes are necessary.
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@Br1 Done, it works as expected.
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@Br1 I am on RC test OTA-4, it seems ok for me.
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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.
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@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-cachesif 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
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@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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B Br1 referenced this topic on
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Hi @Br1 . Could you please update your very useful script for Noble ? I'm still using your last focal script which works yet with Noble, but with an error. Thanks in advance.
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