ubuntu fails to resolve DNS
Recently I started to experience strange behavior of my computer -- my browser sometimes suddenly fails to load pages. I restarted my wlan0
(ip link set dev wlan0 up/down) and reconnected to wifi but this did not solve the problem. Then I tried to ping 8.8.8.8 and it worked! So it seems to me that DNS stopped working (judging by this picture, 192.30.253.112 is an ip of github.com)
Does anybody know what is happening and how can I solve it? For now I just reboot my PC and it starts working again.
PS while my browser does not work, skype and telegram work fine. Even browser on my phone works fine.
PPS my kernel version is 4.4.0-66-generic, my ubuntu version is 16.04
networking dns
asked Mar 15 '17 at 18:48
PepeHandsPepeHands
202313
bumped to the homepage by Community♦ 9 hours ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
add a comment |
Recently I started to experience strange behavior of my computer -- my browser sometimes suddenly fails to load pages. I restarted my wlan0
(ip link set dev wlan0 up/down) and reconnected to wifi but this did not solve the problem. Then I tried to ping 8.8.8.8 and it worked! So it seems to me that DNS stopped working (judging by this picture, 192.30.253.112 is an ip of github.com)
Does anybody know what is happening and how can I solve it? For now I just reboot my PC and it starts working again.
PS while my browser does not work, skype and telegram work fine. Even browser on my phone works fine.
PPS my kernel version is 4.4.0-66-generic, my ubuntu version is 16.04
networking dns
asked Mar 15 '17 at 18:48
PepeHandsPepeHands
202313
bumped to the homepage by Community♦ 9 hours ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
add a comment |
Recently I started to experience strange behavior of my computer -- my browser sometimes suddenly fails to load pages. I restarted my wlan0
(ip link set dev wlan0 up/down) and reconnected to wifi but this did not solve the problem. Then I tried to ping 8.8.8.8 and it worked! So it seems to me that DNS stopped working (judging by this picture, 192.30.253.112 is an ip of github.com)
Does anybody know what is happening and how can I solve it? For now I just reboot my PC and it starts working again.
PS while my browser does not work, skype and telegram work fine. Even browser on my phone works fine.
PPS my kernel version is 4.4.0-66-generic, my ubuntu version is 16.04
networking dns
asked Mar 15 '17 at 18:48
PepeHandsPepeHands
202313
Recently I started to experience strange behavior of my computer -- my browser sometimes suddenly fails to load pages. I restarted my wlan0
(ip link set dev wlan0 up/down) and reconnected to wifi but this did not solve the problem. Then I tried to ping 8.8.8.8 and it worked! So it seems to me that DNS stopped working (judging by this picture, 192.30.253.112 is an ip of github.com)
Does anybody know what is happening and how can I solve it? For now I just reboot my PC and it starts working again.
PS while my browser does not work, skype and telegram work fine. Even browser on my phone works fine.
PPS my kernel version is 4.4.0-66-generic, my ubuntu version is 16.04
networking dns
networking dns
asked Mar 15 '17 at 18:48
PepeHandsPepeHands
202313
asked Mar 15 '17 at 18:48
PepeHandsPepeHands
202313
asked Mar 15 '17 at 18:48
PepeHandsPepeHands
202313
asked Mar 15 '17 at 18:48
PepeHandsPepeHands
202313
asked Mar 15 '17 at 18:48
PepeHandsPepeHands
202313
202313
bumped to the homepage by Community♦ 9 hours ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
bumped to the homepage by Community♦ 9 hours ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
If ANY DNS lookup resolves then DNS is probably ok.
In your example you can ping 192.30.253.112 which is in the github network but that does not mean that this is the server that your DNS will resolve to.
In my case:
dig github.com returns 192.30.253.113
To isolate your issue, when your browser is unable to load a page, type:
nslookup desired_url
If you can't ping the IP that nslookup returns, the server is probably down (or you are being blocked).
If you can ping the IP but the page never loads you are probably being blocked or the site is having some sort of problem. There are a variety of reasons why a site may block you.
If other Internet apps like Skype work but your browser doesn't, I'd be looking at your browser configuration or addons that might be causing problems.
answered Mar 15 '17 at 19:06
jones0610jones0610
1,3421421
Actually ALL sites are blocked for me (while from our PCs I can reach them) and also it's not just 1 browser -- all of which I have (Chrome, Mozila, Opera) don't work.
– PepeHands
Mar 15 '17 at 19:37
Alsodig github.comreturns me both 112 and 113
– PepeHands
Mar 15 '17 at 19:38
I'm happy to chat with you about this via PM. My answer showed how to verify that DNS is working. It's rather clear, based on your response, that you do not have a DNS problem. If you can resolve the domain name with dig and if you can ping the IP it resolves to something in the browser(s) or the target web site is preventing a connection. You can eliminate GUI browsers and all of those plugins by trying: lynx github.com from a shell.
– jones0610
Mar 15 '17 at 20:01
Well, I've already restarted my PC (to write this post e.g.) so I made thisdigafter rebooting (and thus everything worked fine). I just made it to verify that I used correct IP for github.
– PepeHands
Mar 15 '17 at 23:21
add a comment |
I found a simple workaround for this problem.
echo "nameserver 8.8.8.8" | sudo tee /etc/resolv.conf
This command solves problem when it appears but I still doesn't know what causes it.
answered Mar 24 '17 at 20:00
PepeHandsPepeHands
202313
add a comment |
Your Answer
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "89"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2faskubuntu.com%2fquestions%2f893404%2fubuntu-fails-to-resolve-dns%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
If ANY DNS lookup resolves then DNS is probably ok.
In your example you can ping 192.30.253.112 which is in the github network but that does not mean that this is the server that your DNS will resolve to.
In my case:
dig github.com returns 192.30.253.113
To isolate your issue, when your browser is unable to load a page, type:
nslookup desired_url
If you can't ping the IP that nslookup returns, the server is probably down (or you are being blocked).
If you can ping the IP but the page never loads you are probably being blocked or the site is having some sort of problem. There are a variety of reasons why a site may block you.
If other Internet apps like Skype work but your browser doesn't, I'd be looking at your browser configuration or addons that might be causing problems.
answered Mar 15 '17 at 19:06
jones0610jones0610
1,3421421
Actually ALL sites are blocked for me (while from our PCs I can reach them) and also it's not just 1 browser -- all of which I have (Chrome, Mozila, Opera) don't work.
– PepeHands
Mar 15 '17 at 19:37
Alsodig github.comreturns me both 112 and 113
– PepeHands
Mar 15 '17 at 19:38
I'm happy to chat with you about this via PM. My answer showed how to verify that DNS is working. It's rather clear, based on your response, that you do not have a DNS problem. If you can resolve the domain name with dig and if you can ping the IP it resolves to something in the browser(s) or the target web site is preventing a connection. You can eliminate GUI browsers and all of those plugins by trying: lynx github.com from a shell.
– jones0610
Mar 15 '17 at 20:01
Well, I've already restarted my PC (to write this post e.g.) so I made thisdigafter rebooting (and thus everything worked fine). I just made it to verify that I used correct IP for github.
– PepeHands
Mar 15 '17 at 23:21
add a comment |
If ANY DNS lookup resolves then DNS is probably ok.
In your example you can ping 192.30.253.112 which is in the github network but that does not mean that this is the server that your DNS will resolve to.
In my case:
dig github.com returns 192.30.253.113
To isolate your issue, when your browser is unable to load a page, type:
nslookup desired_url
If you can't ping the IP that nslookup returns, the server is probably down (or you are being blocked).
If you can ping the IP but the page never loads you are probably being blocked or the site is having some sort of problem. There are a variety of reasons why a site may block you.
If other Internet apps like Skype work but your browser doesn't, I'd be looking at your browser configuration or addons that might be causing problems.
answered Mar 15 '17 at 19:06
jones0610jones0610
1,3421421
Actually ALL sites are blocked for me (while from our PCs I can reach them) and also it's not just 1 browser -- all of which I have (Chrome, Mozila, Opera) don't work.
– PepeHands
Mar 15 '17 at 19:37
Alsodig github.comreturns me both 112 and 113
– PepeHands
Mar 15 '17 at 19:38
I'm happy to chat with you about this via PM. My answer showed how to verify that DNS is working. It's rather clear, based on your response, that you do not have a DNS problem. If you can resolve the domain name with dig and if you can ping the IP it resolves to something in the browser(s) or the target web site is preventing a connection. You can eliminate GUI browsers and all of those plugins by trying: lynx github.com from a shell.
– jones0610
Mar 15 '17 at 20:01
Well, I've already restarted my PC (to write this post e.g.) so I made thisdigafter rebooting (and thus everything worked fine). I just made it to verify that I used correct IP for github.
– PepeHands
Mar 15 '17 at 23:21
add a comment |
If ANY DNS lookup resolves then DNS is probably ok.
In your example you can ping 192.30.253.112 which is in the github network but that does not mean that this is the server that your DNS will resolve to.
In my case:
dig github.com returns 192.30.253.113
To isolate your issue, when your browser is unable to load a page, type:
nslookup desired_url
If you can't ping the IP that nslookup returns, the server is probably down (or you are being blocked).
If you can ping the IP but the page never loads you are probably being blocked or the site is having some sort of problem. There are a variety of reasons why a site may block you.
If other Internet apps like Skype work but your browser doesn't, I'd be looking at your browser configuration or addons that might be causing problems.
answered Mar 15 '17 at 19:06
jones0610jones0610
1,3421421
If ANY DNS lookup resolves then DNS is probably ok.
In your example you can ping 192.30.253.112 which is in the github network but that does not mean that this is the server that your DNS will resolve to.
In my case:
dig github.com returns 192.30.253.113
To isolate your issue, when your browser is unable to load a page, type:
nslookup desired_url
If you can't ping the IP that nslookup returns, the server is probably down (or you are being blocked).
If you can ping the IP but the page never loads you are probably being blocked or the site is having some sort of problem. There are a variety of reasons why a site may block you.
If other Internet apps like Skype work but your browser doesn't, I'd be looking at your browser configuration or addons that might be causing problems.
answered Mar 15 '17 at 19:06
jones0610jones0610
1,3421421
answered Mar 15 '17 at 19:06
jones0610jones0610
1,3421421
answered Mar 15 '17 at 19:06
jones0610jones0610
1,3421421
answered Mar 15 '17 at 19:06
jones0610jones0610
1,3421421
1,3421421
Actually ALL sites are blocked for me (while from our PCs I can reach them) and also it's not just 1 browser -- all of which I have (Chrome, Mozila, Opera) don't work.
– PepeHands
Mar 15 '17 at 19:37
Alsodig github.comreturns me both 112 and 113
– PepeHands
Mar 15 '17 at 19:38
I'm happy to chat with you about this via PM. My answer showed how to verify that DNS is working. It's rather clear, based on your response, that you do not have a DNS problem. If you can resolve the domain name with dig and if you can ping the IP it resolves to something in the browser(s) or the target web site is preventing a connection. You can eliminate GUI browsers and all of those plugins by trying: lynx github.com from a shell.
– jones0610
Mar 15 '17 at 20:01
Well, I've already restarted my PC (to write this post e.g.) so I made thisdigafter rebooting (and thus everything worked fine). I just made it to verify that I used correct IP for github.
– PepeHands
Mar 15 '17 at 23:21
add a comment |
Actually ALL sites are blocked for me (while from our PCs I can reach them) and also it's not just 1 browser -- all of which I have (Chrome, Mozila, Opera) don't work.
– PepeHands
Mar 15 '17 at 19:37
Alsodig github.comreturns me both 112 and 113
– PepeHands
Mar 15 '17 at 19:38
I'm happy to chat with you about this via PM. My answer showed how to verify that DNS is working. It's rather clear, based on your response, that you do not have a DNS problem. If you can resolve the domain name with dig and if you can ping the IP it resolves to something in the browser(s) or the target web site is preventing a connection. You can eliminate GUI browsers and all of those plugins by trying: lynx github.com from a shell.
– jones0610
Mar 15 '17 at 20:01
Well, I've already restarted my PC (to write this post e.g.) so I made thisdigafter rebooting (and thus everything worked fine). I just made it to verify that I used correct IP for github.
– PepeHands
Mar 15 '17 at 23:21
Actually ALL sites are blocked for me (while from our PCs I can reach them) and also it's not just 1 browser -- all of which I have (Chrome, Mozila, Opera) don't work.
– PepeHands
Mar 15 '17 at 19:37
Actually ALL sites are blocked for me (while from our PCs I can reach them) and also it's not just 1 browser -- all of which I have (Chrome, Mozila, Opera) don't work.
– PepeHands
Mar 15 '17 at 19:37
Also
dig github.com returns me both 112 and 113– PepeHands
Mar 15 '17 at 19:38
Also
dig github.com returns me both 112 and 113– PepeHands
Mar 15 '17 at 19:38
I'm happy to chat with you about this via PM. My answer showed how to verify that DNS is working. It's rather clear, based on your response, that you do not have a DNS problem. If you can resolve the domain name with dig and if you can ping the IP it resolves to something in the browser(s) or the target web site is preventing a connection. You can eliminate GUI browsers and all of those plugins by trying: lynx github.com from a shell.
– jones0610
Mar 15 '17 at 20:01
I'm happy to chat with you about this via PM. My answer showed how to verify that DNS is working. It's rather clear, based on your response, that you do not have a DNS problem. If you can resolve the domain name with dig and if you can ping the IP it resolves to something in the browser(s) or the target web site is preventing a connection. You can eliminate GUI browsers and all of those plugins by trying: lynx github.com from a shell.
– jones0610
Mar 15 '17 at 20:01
Well, I've already restarted my PC (to write this post e.g.) so I made this
dig after rebooting (and thus everything worked fine). I just made it to verify that I used correct IP for github.– PepeHands
Mar 15 '17 at 23:21
Well, I've already restarted my PC (to write this post e.g.) so I made this
dig after rebooting (and thus everything worked fine). I just made it to verify that I used correct IP for github.– PepeHands
Mar 15 '17 at 23:21
add a comment |
I found a simple workaround for this problem.
echo "nameserver 8.8.8.8" | sudo tee /etc/resolv.conf
This command solves problem when it appears but I still doesn't know what causes it.
answered Mar 24 '17 at 20:00
PepeHandsPepeHands
202313
add a comment |
I found a simple workaround for this problem.
echo "nameserver 8.8.8.8" | sudo tee /etc/resolv.conf
This command solves problem when it appears but I still doesn't know what causes it.
answered Mar 24 '17 at 20:00
PepeHandsPepeHands
202313
add a comment |
I found a simple workaround for this problem.
echo "nameserver 8.8.8.8" | sudo tee /etc/resolv.conf
This command solves problem when it appears but I still doesn't know what causes it.
answered Mar 24 '17 at 20:00
PepeHandsPepeHands
202313
I found a simple workaround for this problem.
echo "nameserver 8.8.8.8" | sudo tee /etc/resolv.conf
This command solves problem when it appears but I still doesn't know what causes it.
answered Mar 24 '17 at 20:00
PepeHandsPepeHands
202313
answered Mar 24 '17 at 20:00
PepeHandsPepeHands
202313
answered Mar 24 '17 at 20:00
PepeHandsPepeHands
202313
answered Mar 24 '17 at 20:00
PepeHandsPepeHands
202313
202313
add a comment |
add a comment |
Thanks for contributing an answer to Ask Ubuntu!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2faskubuntu.com%2fquestions%2f893404%2fubuntu-fails-to-resolve-dns%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
