[CentOS] Centos 5.4 DNS resolution issue

Gaurav N. gaurav.knangla at gmail.com
Mon Mar 8 19:55:16 UTC 2010


UPDATE:

I tried with FreeBSD8 as well and the DNS query didn't work. This is
beginning to look more and more like an issue with my UTStarcom *WA3002G4
ADSL2+ Router and its NAT config or the lack of it.*
*
*
*My setup and the ip addresses:*
*Router         192.168.1.1*
*Windows      192.168.1.2*
*Centos 5.4   192.168.1.3*
*FreeBSD8    192.168.1.4*
*
*
*The windows host works fine with no issues with DNS queries.*

Best Regards,
Gaurav



On Tue, Mar 9, 2010 at 12:08 AM, Gaurav Nangla <gaurav.knangla at gmail.com>wrote:

> [root at cent5 ~]# dig www.google.com @208.67.220.220
>
> ; <<>> DiG 9.3.6-P1-RedHat-9.3.6-4.P1.el5 <<>> www.google.com @
> 208.67.220.220
>  ;; global options:  printcmd
> ;; connection timed out; no servers could be reached
>
> Best Regards,
> Gaurav
>
>
>
> On Mon, Mar 8, 2010 at 5:21 PM, Pitshou Asingalembi <depitsho at yahoo.fr>wrote:
>
>> John R Pierce wrote:
>> > Gaurav Nangla wrote:
>> >
>> >> I can ping the google.com <http://google.com> ip addresses
>> >> (209.85.231.104) but can't ping the FQDN, obviously DNS is broken.
>> >>
>> >> I can also ping the nameserver ip addresses specified in
>> /etc/resolv.conf.
>> >>
>> >
>> > well, the DNS servers given by your resolv.conf output seem valid from
>> > here..  I recommend doing some more debugging with `host` or similar DNS
>> > diagnostic tools.
>> >
>> > note regular DNS lookups like these tend to use UDP rather than TCP, if
>> > you're behind a NAT firewall which doesn't allow outbound udp port 53
>> > and connection track the response, then things might not work well.
>> >
>> >
>> > $ host google.com 208.67.220.220
>> > Using domain server:
>> > Name: 208.67.220.220
>> > Address: 208.67.220.220#53
>> > Aliases:
>> >
>> > google.com has address 74.125.19.105
>> > google.com has address 74.125.19.99
>> > google.com has address 74.125.19.103
>> > google.com has address 74.125.19.106
>> > google.com has address 74.125.19.147
>> > google.com has address 74.125.19.104
>> > google.com mail is handled by 400 google.com.s9b2.psmtp.com.
>> > google.com mail is handled by 200 google.com.s9a2.psmtp.com.
>> > google.com mail is handled by 300 google.com.s9b1.psmtp.com.
>> > google.com mail is handled by 100 google.com.s9a1.psmtp.com.
>> >
>> > $ host google.com 208.67.222.222
>> > Using domain server:
>> > Name: 208.67.222.222
>> > Address: 208.67.222.222#53
>> > Aliases:
>> >
>> > google.com has address 74.125.19.105
>> > google.com has address 74.125.19.147
>> > google.com has address 74.125.19.99
>> > google.com has address 74.125.19.103
>> > google.com has address 74.125.19.104
>> > google.com has address 74.125.19.106
>> > google.com mail is handled by 400 google.com.s9b2.psmtp.com.
>> > google.com mail is handled by 200 google.com.s9a2.psmtp.com.
>> > google.com mail is handled by 300 google.com.s9b1.psmtp.com.
>> > google.com mail is handled by 100 google.com.s9a1.psmtp.com.
>> > _______________________________________________
>> > CentOS mailing list
>> > CentOS at centos.org
>> > http://lists.centos.org/mailman/listinfo/centos
>> >
>> >
>> please try:
>> dig www.google.com @IPofyourDNSserver
>> and send me the output
>> _______________________________________________
>> CentOS mailing list
>> CentOS at centos.org
>> http://lists.centos.org/mailman/listinfo/centos
>>
>
>
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