Nslookup works well but ping not
Hi
I opened this thead because in my network began to happend to the users, I saw some ways to fixed this, but it's only a workaround and the root cause it's not solved.
The problem began with my exchange users, they can not connect to the CAS server, if I made a nslookup, it resolve good, but if I send a ping to the name I used in nslookup, the client says that the hostname cannot be found, in the web information
I read its says that running "net stop dnscache" and disabling "DNS Client" solve this, but this is only a workaround because thisbegan to increase in all the users in my network.
All my clients are Windows 7 professional and some Windows 7 Enterprise, if someone know how to avoid this will be apreciated.
ThanksDoc MX
August 16th, 2012 12:46pm
What do you expect from ping if ping is not allowed in "receiving" computer? Check the incoming FW settings.
Try to use network monitor if you think that there is problem with connectivity.
Regards
Milos
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August 16th, 2012 2:20pm
Hi
The problem is that the ping can not connect to the server because it shows that can't find IP for the name of the server, but the nslookup gives me an IP address, if I ping the server by IP address the client gets a response from the server.
So when the user opens the outlook the appl shows the server offline.
The firewall is not the problem, it's already disabledin the server.Doc MX
August 18th, 2012 7:52am
Hey
you went wrong with host name resolve ,
nslookup set type=any youdomain.com
any result should be ok
set type=a youhost.com
result should return an appropriate information
=====
check you resolve stub should not alter of edit before
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August 18th, 2012 11:35am
Hi, I think I didn't explain in the right way my problem.
I'll write the commands and the responses from the client (not all the clients occurs this):
nslookup server1.dom.local
Server: dns.domlocal
Address: 10.0.7.113
name: server1.dom.local
Address: 10.0.7.10
When I done a ping:
Ping server1.dom.local
Ping request could not find host server1.dom.local. Please check the name and try again.
If I ping by IP:
ping 10.0.7.10
Pinging 10.0.7.10 with 32 bytes of data:
Reply from 10.0.7.10: bytes=32 time<1ms TTL=127
Reply from 10.0.7.10: bytes=32 time<1ms TTL=127
Reply from 10.0.7.10: bytes=32 time<1ms TTL=127
Reply from 10.0.7.10: bytes=32 time<1ms TTL=127
Ping statistics for 10.0.7.10:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms
So the outlook when its opened, it can not find the server, I used 2 workaround:
-Add in the file host the IP and the server name
-net stop dnscache (this solved, but if I restart the machine the problem comes again, that's because I disabled this service "DNS Client" by GPO)
I think this is not normal, all my clients have FEP installed like antivirus, all are inside the domain...
What could be the root of this problem?
Thanks in advanceDoc MX
August 18th, 2012 3:14pm
Hey bro i see You have problem with name resolver so please
c:\nslookup set type=any yourdomain.com
and capture the output and paste here
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August 21st, 2012 10:08am
Hi, this is the info you asked:
C:\Documents and Settings\C4r0l>nslookup
Default Server: gdactdirp1.gdar.local
Address: 10.0.7.223
> set type=any
> gdar.local
Server: gdactdirp1.gdar.local
Address: 10.0.7.223
gdar.local internet address = 10.0.7.223
gdar.local internet address = 10.0.7.225
gdar.local nameserver = gdactdirp2.gdar.local
gdar.local nameserver = gdactdirp1.gdar.local
gdar.local
primary name server = gdactdirp1.gdar.local
responsible mail addr = hostmaster.gdar.local
serial = 56695
refresh = 900 (15 mins)
retry = 600 (10 mins)
expire = 86400 (1 day)
default TTL = 3600 (1 hour)
gdactdirp2.gdar.local internet address = 10.0.7.225
gdactdirp1.gdar.local internet address = 10.0.7.223
These 2 are my DC's
Thank'sDoc MX
August 21st, 2012 10:39am
Bro sorry for late reply ,
Have you tried doing it,
Ping gdactdirp2.gdar.local <----- Whats the result ?
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August 22nd, 2012 1:31pm
When you say "The problem began with my exchange users, they can not connect to the CAS server, " Can you post the
exact ERROR messg it will help to find exact trouble shooting ! post the error message from event log here
so as long as Wat i suspect here is
No1 : It may be a DNS resolution problem youre having .you may need to create an A Record on the DNS Server , that has the Pointing IP Address say "gdactdirp2.gdar.local" IP Address
No 2 : check the cas services, imap , pop3 and msexchange service host. will u tell the exact problem to ur
client. you try to connect by web or outlook
No 3: Changing the type to A instead of any. Also I would suggest setting the local host names, through static IP's in your DHCP server/router. When it is set through static ip in the DHCP; you have no need for a DNS. Also
if you do already have it set statically, this could also be the problem... It's trying to do a double lookup and packets are likely being dropped. For instance, if your DHCP hostname is gdar.local; setting the IP to the proper Mac with the hostname gdactdirp1.
Then localling pinging gdactdirp1.gdar.local will resolve, and you will get your packets...
And POST me here the webaccess Outlook Link , Lemme see , and Please Post the Error Log bro, thanks for your patience
Thanks,
Suren
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August 22nd, 2012 1:36pm
Hi
Well, I think that the initial question had a great deviation about the original problem...
-The DNS resolution is working good, all the resolution and A records are returned well to the client.
-The Exchange server is online and respond well with ping to the IP Address (I disabled the firewall)
-The problem that I found is the DNS user cache, if I disabled this services, all the communications works good, but if I enabled the pc has problems to communicate, especifically with exchange.
So my question is: Why I have to disabled the DNSClient service (in every pc client) to avoid problems in the communicacin to some services like the email?
I hope I'm clear, my english is not enough good :D
Thanks!
Doc MX
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August 23rd, 2012 7:35pm
Hi to all!!
Any idea why the pcs behavioral in this way?? I left the service "DNS Client" disabled and all the clients work very well, but I suppouse this is only a workaround and I think the equipment should work with this service enabled.
I hope to know news
Thanks!
Doc MX
DNS Client should not be Disabled , If its Disabled windows
dnscache will not cache the Domain names server in the client machine and will not register the Client computer name in the server also..but resolution still works using reverse look up..
to be in the safer side dnsclient service shud be start to work flawlessly
Thanks,
SurenFace the fact tat we all have plenty to learn about this field. Deal wit the failures, use tem as motivation, learn something new everyday. Claiming false credentials & phantom skillsets will not get you far, especially when 63248651487512645876531864
people in the universe know how 2 use the internet Please remember to click Mark as Answer on the post that helps you, Please VOTE as HELPFUL if the post helps you. This can be beneficial to other community members reading the thread.
August 30th, 2012 9:48am
Hi
Ok, I understand the problem that respresent disable the dnscache, but if I enabled, many clients began to have problem with the communication with some servers, specially Exchange CAS server.
Is there a root cause of this behavior? to solve and enable again the DNSCache.
ThanksDoc MX
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August 30th, 2012 10:34am
Hi to all!!
Any idea why the pcs behavioral in this way?? I left the service "DNS Client" disabled and all the clients work very well, but I suppouse this is only a workaround and I think the equipment should work with this service enabled.
I hope to know news
Thanks!Doc MX
August 30th, 2012 11:18am
When u say Enabled , Did you do that on Server Machine ? if u change it to enabled on the server of course all ur client also need to be run the DNSclient service to run without problems !!Face the fact tat we all have plenty to learn about this field. Deal wit the failures, use tem as motivation, learn something new everyday. Claiming false credentials & phantom skillsets will not get you far, especially when 63248651487512645876531864
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September 4th, 2012 1:15pm
Hi
I said enable in the client machines, in the servers I did not disable, just in the clients.Doc MX
September 6th, 2012 10:27am
Hi Suernsach
I test all the things you tell me and all works, let me reinforce the principal question:
Some client computers, can ping using the IP to the CAS server, but if I ping using the server CAS name they can not, BUT
if I disable DNSCACHE service in the same client computer that presented that problem, they can use ping by IP and Name (and certainly, outlook works), so Why is this behavior?, I know that these service its necesary to register the client
computer in the DNS server.
I hope this clarify my problem
ThanksDoc MX
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September 19th, 2012 11:59am