DNS Update Issue
-
@scottalanmiller said in DNS Update Issue:
how does it prove anything?
I have to use flushdns because it won't use ANY DNS server if stuff is cached locally.
-
Well I suppose I can come up with a list of stuff on the DNS server to prevent... dunno why I didn't think of that.
-
@Obsolesce said in DNS Update Issue:
@scottalanmiller said in DNS Update Issue:
how does it prove anything?
I have to use flushdns because it won't use ANY DNS server if stuff is cached locally.
It should, but you are testing incorrectly. You test with nslookup, not ping. nslookup should not use a cache, by definition. If it does, it is broken. Ping is not a useful testing mechanism because it hits the cache.
-
@scottalanmiller said in DNS Update Issue:
@Obsolesce said in DNS Update Issue:
@scottalanmiller said in DNS Update Issue:
how does it prove anything?
I have to use flushdns because it won't use ANY DNS server if stuff is cached locally.
It should, but you are testing incorrectly. You test with nslookup, not ping. nslookup should not use a cache, by definition. If it does, it is broken. Ping is not a useful testing mechanism because it hits the cache.
I mentioned the word ping like a bunch of times... read it again.
-
@scottalanmiller said in DNS Update Issue:
Ping is not a useful testing mechanism because it hits the cache.
Ping does not hit the cache on the computer I'm testing from because I cleared the DNS cache.
-
@Obsolesce said in DNS Update Issue:
@scottalanmiller said in DNS Update Issue:
@Obsolesce said in DNS Update Issue:
@scottalanmiller said in DNS Update Issue:
how does it prove anything?
I have to use flushdns because it won't use ANY DNS server if stuff is cached locally.
It should, but you are testing incorrectly. You test with nslookup, not ping. nslookup should not use a cache, by definition. If it does, it is broken. Ping is not a useful testing mechanism because it hits the cache.
I mentioned the word ping like a bunch of times... read it again.
I know you did, that's how I know you used ping, which is what won't work. You need to test with nslookup, which is the DNS testing tool. Ping is for testing ICMP, not DNS.
-
@Obsolesce said in DNS Update Issue:
@scottalanmiller said in DNS Update Issue:
Ping is not a useful testing mechanism because it hits the cache.
Ping does not hit the cache on the computer I'm testing from because I cleared the DNS cache.
I know, thereby corrupting the test and making it useless.
-
Just test again with nslookup instead of ping, and no flushing.
-
@scottalanmiller said in DNS Update Issue:
@Obsolesce said in DNS Update Issue:
@scottalanmiller said in DNS Update Issue:
Ping is not a useful testing mechanism because it hits the cache.
Ping does not hit the cache on the computer I'm testing from because I cleared the DNS cache.
I know, thereby corrupting the test and making it useless.
Dude, i looked at the fucking debug logs on the DNS server itself, i KNOW it used the DNS server when I pinged, every damn time. I still have the logs to prove it. I pinged stuff by NAME, not IP. When you ping stuff by name, it uses DNS to look up the IP....
Also, I was pinging random servers and such, NOT the DNS server.
-
@Obsolesce said in DNS Update Issue:
@scottalanmiller said in DNS Update Issue:
@Obsolesce said in DNS Update Issue:
@scottalanmiller said in DNS Update Issue:
Ping is not a useful testing mechanism because it hits the cache.
Ping does not hit the cache on the computer I'm testing from because I cleared the DNS cache.
I know, thereby corrupting the test and making it useless.
Dude, i looked at the fucking debug logs on the DNS server itself, i KNOW it used the DNS server when I pinged, every damn time. I still have the logs to prove it. I pinged stuff by NAME, not IP. When you ping stuff by name, it uses DNS to look up the IP....
Also, I was pinging random servers and such, NOT the DNS server.
And, what does what you said have to do with the problem? Nothing you said here addressed the issue that we are discussing. You clearly stated you used the wrong tool, and clearly stated that you had to flush the DNS and corrupt the test because you used the wrong tool, after that all of your responses are to someone who isn't here, because they are unrelated to what I've been saying.
Just do the test again with the proper tool and without corrupting it. The DNS servers logs are obviously useless here as we already know the test wasn't done correctly so what you see tells us literally nothing.
-
@scottalanmiller said in DNS Update Issue:
@Obsolesce said in DNS Update Issue:
@scottalanmiller said in DNS Update Issue:
@Obsolesce said in DNS Update Issue:
@scottalanmiller said in DNS Update Issue:
Ping is not a useful testing mechanism because it hits the cache.
Ping does not hit the cache on the computer I'm testing from because I cleared the DNS cache.
I know, thereby corrupting the test and making it useless.
Dude, i looked at the fucking debug logs on the DNS server itself, i KNOW it used the DNS server when I pinged, every damn time. I still have the logs to prove it. I pinged stuff by NAME, not IP. When you ping stuff by name, it uses DNS to look up the IP....
Also, I was pinging random servers and such, NOT the DNS server.
And, what does what you said have to do with the problem? Nothing you said here addressed the issue that we are discussing. You clearly stated you used the wrong tool, and clearly stated that you had to flush the DNS and corrupt the test because you used the wrong tool, after that all of your responses are to someone who isn't here, because they are unrelated to what I've been saying.
Just do the test again with the proper tool and without corrupting it. The DNS servers logs are obviously useless here as we already know the test wasn't done correctly so what you see tells us literally nothing.
The test was to see which DNS server is being used and when.
I did not use the wrong tool. When you ping something by hostname, it WILL do a DNS lookup.
If you had read what I wrote originally, I did say that I used nslookup, which only worked when the primary DNS server was available. But nslookup would fail otherwise, even though other DNS servers were responding to DNS requests. I have to logs to prove everything. You're idea of which tool is correct for the job is incorrect.
-
@Obsolesce said in DNS Update Issue:
@scottalanmiller said in DNS Update Issue:
@Obsolesce said in DNS Update Issue:
@scottalanmiller said in DNS Update Issue:
@Obsolesce said in DNS Update Issue:
@scottalanmiller said in DNS Update Issue:
Ping is not a useful testing mechanism because it hits the cache.
Ping does not hit the cache on the computer I'm testing from because I cleared the DNS cache.
I know, thereby corrupting the test and making it useless.
Dude, i looked at the fucking debug logs on the DNS server itself, i KNOW it used the DNS server when I pinged, every damn time. I still have the logs to prove it. I pinged stuff by NAME, not IP. When you ping stuff by name, it uses DNS to look up the IP....
Also, I was pinging random servers and such, NOT the DNS server.
And, what does what you said have to do with the problem? Nothing you said here addressed the issue that we are discussing. You clearly stated you used the wrong tool, and clearly stated that you had to flush the DNS and corrupt the test because you used the wrong tool, after that all of your responses are to someone who isn't here, because they are unrelated to what I've been saying.
Just do the test again with the proper tool and without corrupting it. The DNS servers logs are obviously useless here as we already know the test wasn't done correctly so what you see tells us literally nothing.
The test was to see which DNS server is being used and when.
Sure, but not in a scenario we cared about. So the test was for you, not for this thread. What you tested is not what we discussed. You need one without flushing DNS to test what WE have been discussing. Unless you do that, this test should be its own thread and shows us nothing we didn't already know.
-
@Obsolesce said in DNS Update Issue:
I did not use the wrong tool. When you ping something by hostname, it WILL do a DNS lookup.
Only if it is not cached. As YOU pointed out. So you know this isn't true.
-
@scottalanmiller said in DNS Update Issue:
@Obsolesce said in DNS Update Issue:
@scottalanmiller said in DNS Update Issue:
@Obsolesce said in DNS Update Issue:
@scottalanmiller said in DNS Update Issue:
@Obsolesce said in DNS Update Issue:
@scottalanmiller said in DNS Update Issue:
Ping is not a useful testing mechanism because it hits the cache.
Ping does not hit the cache on the computer I'm testing from because I cleared the DNS cache.
I know, thereby corrupting the test and making it useless.
Dude, i looked at the fucking debug logs on the DNS server itself, i KNOW it used the DNS server when I pinged, every damn time. I still have the logs to prove it. I pinged stuff by NAME, not IP. When you ping stuff by name, it uses DNS to look up the IP....
Also, I was pinging random servers and such, NOT the DNS server.
And, what does what you said have to do with the problem? Nothing you said here addressed the issue that we are discussing. You clearly stated you used the wrong tool, and clearly stated that you had to flush the DNS and corrupt the test because you used the wrong tool, after that all of your responses are to someone who isn't here, because they are unrelated to what I've been saying.
Just do the test again with the proper tool and without corrupting it. The DNS servers logs are obviously useless here as we already know the test wasn't done correctly so what you see tells us literally nothing.
The test was to see which DNS server is being used and when.
Sure, but not in a scenario we cared about. So the test was for you, not for this thread. What you tested is not what we discussed. You need one without flushing DNS to test what WE have been discussing. Unless you do that, this test should be its own thread and shows us nothing we didn't already know.
Working on a new test and much clearer description of the test and results.
-
@scottalanmiller said in DNS Update Issue:
@Obsolesce said in DNS Update Issue:
I did not use the wrong tool. When you ping something by hostname, it WILL do a DNS lookup.
Only if it is not cached. As YOU pointed out. So you know this isn't true.
In this next test, I will ping stuff that is guaranteed not to be locally cached.
-
@Obsolesce said in DNS Update Issue:
If you had read what I wrote originally, I did say that I used nslookup, which only worked when the primary DNS server was available. But nslookup would fail otherwise, even though other DNS servers were responding to DNS requests. I have to logs to prove everything. You're idea of which tool is correct for the job is incorrect.
Only nslookup can do the job for this test for reasons both you and I pointed out. Ping can't be used because you have to flush manually first, thereby making the test useless. You pointed this out, so no need to argue with me for having read when you wrote and repeating it back.
If nslookup totally fails, this means Windows isn't working at all and I'm confident that that is not true. Something else is wrong. It's not reasonable to believe that Windows cannot do DNS lookups ever to secondary DNS servers without resorting to other tools and manual intervention, we've all seen this work so your test must be mistaken. It's like saying the sky isn't blue because you did a test, while we can all look out the window and know that that isn't possibly true. So the test has to be wrong.
-
@Obsolesce said in DNS Update Issue:
@scottalanmiller said in DNS Update Issue:
@Obsolesce said in DNS Update Issue:
I did not use the wrong tool. When you ping something by hostname, it WILL do a DNS lookup.
Only if it is not cached. As YOU pointed out. So you know this isn't true.
In this next test, I will ping stuff that is guaranteed not to be locally cached.
WHY are you still pinging? We've established it cannot be used for anything to do with this thread.
-
@Obsolesce said in DNS Update Issue:
@scottalanmiller said in DNS Update Issue:
@Obsolesce said in DNS Update Issue:
@scottalanmiller said in DNS Update Issue:
@Obsolesce said in DNS Update Issue:
@scottalanmiller said in DNS Update Issue:
@Obsolesce said in DNS Update Issue:
@scottalanmiller said in DNS Update Issue:
Ping is not a useful testing mechanism because it hits the cache.
Ping does not hit the cache on the computer I'm testing from because I cleared the DNS cache.
I know, thereby corrupting the test and making it useless.
Dude, i looked at the fucking debug logs on the DNS server itself, i KNOW it used the DNS server when I pinged, every damn time. I still have the logs to prove it. I pinged stuff by NAME, not IP. When you ping stuff by name, it uses DNS to look up the IP....
Also, I was pinging random servers and such, NOT the DNS server.
And, what does what you said have to do with the problem? Nothing you said here addressed the issue that we are discussing. You clearly stated you used the wrong tool, and clearly stated that you had to flush the DNS and corrupt the test because you used the wrong tool, after that all of your responses are to someone who isn't here, because they are unrelated to what I've been saying.
Just do the test again with the proper tool and without corrupting it. The DNS servers logs are obviously useless here as we already know the test wasn't done correctly so what you see tells us literally nothing.
The test was to see which DNS server is being used and when.
Sure, but not in a scenario we cared about. So the test was for you, not for this thread. What you tested is not what we discussed. You need one without flushing DNS to test what WE have been discussing. Unless you do that, this test should be its own thread and shows us nothing we didn't already know.
Working on a new test and much clearer description of the test and results.
Stick with nslookup and no flushing. If you flush, it's not a test for this thread. Only a test of a real world scenario will matter. Everything you've done so far is what we all already agreed on.
-
@scottalanmiller said in DNS Update Issue:
@Obsolesce said in DNS Update Issue:
@scottalanmiller said in DNS Update Issue:
@Obsolesce said in DNS Update Issue:
I did not use the wrong tool. When you ping something by hostname, it WILL do a DNS lookup.
Only if it is not cached. As YOU pointed out. So you know this isn't true.
In this next test, I will ping stuff that is guaranteed not to be locally cached.
WHY are you still pinging? We've established it cannot be used for anything to do with this thread.
When you ping something by host name only, it performs a DNS lookup... contacting a DNS server to get the IP address of the target, so that it can ping.
-
The test should be...
- Flush DNS before the test
- nslookup X
- Do #2 several times.
- Kill the DNS server used in steps 2 & 3
- nslookup X
- Do #5 several times
- Restore DNS server from steps 2 & 3
- nslookup X
- Do #8 several times.
That's the test. Any pings tell us nothing, any flushes corrupt the test and mean none of the results are useful or valid.
