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тАО12-28-2009 11:27 PM
тАО12-28-2009 11:27 PM
For example:
[root@blrdns ~]# ping blrdns
PING blrdns.oesblr.nsn-rdnet.net (10.58.131.246) 56(84) bytes of data.
64 bytes from 10.58.131.246: icmp_seq=25 ttl=64 time=0.009 ms
64 bytes from 10.58.131.246: icmp_seq=26 ttl=64 time=0.009 ms
64 bytes from 10.58.131.246: icmp_seq=27 ttl=64 time=0.009 ms
64 bytes from 10.58.131.246: icmp_seq=28 ttl=64 time=0.009 ms
the ping response (64 bytes from ...)will be coming only after 10 seconds.
But if I do nslookup or host command it is immediatly giving the output.
[root@blrdns ~]# nslookup blrdns
Server: 10.58.131.246
Address: 10.58.131.246#53
Name: blrdns.oesblr.nsn-rdnet.net
Address: 10.58.131.246
[root@blrdns ~]# host blrdns
blrdns.oesblr.nsn-rdnet.net has address 10.58.131.246
Can anyone help me why this is happening.
Solved! Go to Solution.
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тАО12-29-2009 12:07 AM
тАО12-29-2009 12:07 AM
Re: DNS issue
nslookup 10.58.131.246
or
host 10.58.131.246
If these have a delay, then your problem is with reverse DNS requests.
Are you using BIND or some other DNS server software?
With BIND, you can enable query logging on the DNS server side to see exactly what is happening there. Other DNS server software may allow something similar.
MK
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тАО12-29-2009 12:08 AM
тАО12-29-2009 12:08 AM
Re: DNS issue
> found that it is working, [...]
Not exactly a complete description of how you
configured this new DNS server, nor of how
you tested it.
> [root@blrdns ~]# nslookup blrdns
> [...]
How well does it work in reverse?:
nslookup 10.58.131.246
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тАО12-29-2009 02:24 AM
тАО12-29-2009 02:24 AM
Re: DNS issue
[root@blrdns ~]# rpm -qa | grep bind
ypbind-1.19-9.el5
bind-utils-9.3.4-9.P1.el5
bind-9.3.4-9.P1.el5
bind-libs-9.3.4-9.P1.el5
If I use nslookup/host command then output is coming very fast (with in a second)
If I do nslookup 10.58.131.246 then I am getting the following very fast.
[root@blrdns named]# nslookup 10.58.131.246
Server: 10.58.131.246
Address: 10.58.131.246#53
246.131.58.10.in-addr.arpa name = blrdns.oesblr.nsn-rdnet.net.
But Its not showing hostname while pinging, please find the below ,
[root@blrdns named]# ping 10.58.131.246
PING 10.58.131.246 (10.58.131.246) 56(84) bytes of data.
64 bytes from 10.58.131.246: icmp_seq=1 ttl=64 time=0.027 ms
64 bytes from 10.58.131.246: icmp_seq=2 ttl=64 time=0.009 ms
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тАО12-29-2009 02:29 AM
тАО12-29-2009 02:29 AM
Re: DNS issue
[root@blrdns named]# cat /etc/named.conf
options {
directory "/var/named";
};
zone "oesblr.nsn-rdnet.net" {
type master;
file "oesblr.nsn-rdnet.zone";
};
zone "131.58.10.in-addr.arpa" {
type master;
notify no;
allow-query { any; };
file "131.58.10.db";
};
-------------------------------------------
[root@blrdns named]# cat /var/named/oesblr.nsn-rdnet.zone
$TTL 86400
@ IN SOA oesblr.nsn-rdnet.net. root. (
535 ; serial (d. adams)
3H ; refresh
15M ; retry
1W ; expiry
1D ) ; minimum
@ IN NS oesblr.nsn-rdnet.net.
blrdns IN A 10.58.131.246
vm131x185 IN A 10.58.131.185
--------------------------------------------
[root@blrdns named]# cat 131.58.10.db
$TTL 86400
131.58.10.in-addr.arpa. IN SOA blrdns.oesblr.nsn-rdnet.net. root. (
42 ; serial (d. adams)
3H ; refresh
15M ; retry
1W ; expiry
1D ) ; minimum
NS oesblr.nsn-rdnet.net
246 IN PTR blrdns.oesblr.nsn-rdnet.net.
185 IN PTR vm131x185.oesblr.nsn-rdnet.net.
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тАО12-29-2009 04:16 AM
тАО12-29-2009 04:16 AM
Re: DNS issue
What is your /etc/nsswitch.conf file says about "host"?
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тАО12-29-2009 06:41 AM
тАО12-29-2009 06:41 AM
Re: DNS issue
hosts dns files
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тАО12-29-2009 07:17 AM
тАО12-29-2009 07:17 AM
Re: DNS issue
and ping by IP has no delay?
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тАО12-29-2009 08:15 PM
тАО12-29-2009 08:15 PM
Re: DNS issue
But it is not showing hostname while pingigng with IP.
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тАО12-29-2009 11:26 PM
тАО12-29-2009 11:26 PM
Re: DNS issue
weird.
what is your resolv.conf? do you have just one DNS server into it ?
>But it is not showing hostname while >pingigng with IP.
it's OK - normal ping behaviour