09-30-2010
nslookup behaving strangely
I have two servers on same domain. one can nslookup other cannot
Psu100 can lookup to psu000, psu010 & psu011
Psu110 can NOT lookup to psu000, psu010 & psu011
I verified resolv.conf entries on both psu000 and psu010 and it contains both name servers (10.200.10.21 & 10.200.11.22).I am wondering why lookup works from one server and doesn't works from other.
___________________________________________________
psu100-> nslookup psu000
Server: 10.200.10.21
Address: 10.200.10.21#53
Name: psu000.selectfamily.com
Address: 10.200.9.100
psu100-> nslookup psu010
Server: 10.200.10.21
Address: 10.200.10.21#53
Name: psu010.selectfamily.com
Address: 10.200.9.105
psu100-> nslookup psu011
Server: 10.200.10.21
Address: 10.200.10.21#53
Name: psu011.selectfamily.com
Address: 10.200.9.111
_______________________________________________________
psu110-> nslookup psu000
Server: 10.200.10.21
Address: 10.200.10.21#53
** server can't find psu000: SERVFAIL
psu110-> nslookup psu010
Server: 10.200.10.21
Address: 10.200.10.21#53
** server can't find psu010: SERVFAIL
psu110-> nslookup psu011
Server: 10.200.10.21
Address: 10.200.10.21#53
** server can't find psu011: SERVFAIL
_______________________________________________________
10 More Discussions You Might Find Interesting
1. UNIX for Advanced & Expert Users
I have a large file with the first 2 characters of each line determining the type of record. type 03 being a subheader and then it will have multiple 04 records.
eg: 03,xxx,xxxx,xxxx
04,xxxxxxxxxxxxxxxxxxxxxxxxxxxx
04,xxxxxxxxxxxxxxxxxxxxxxxxxxxx
03,xxx,xxx,xxx
... (2 Replies)
Discussion started by: badg3r
2 Replies
2. UNIX for Advanced & Expert Users
Hy guys, I'm having a very strange problem, every time I change the /etc/hosts file on an Ubuntu machine @ work, every time I change the line:
127.0.0.1 programmer.COMPANY
to
127.0.0.1 programmer.COMPANY programmer
It works till the next reboot, now, I have never experienced this on... (5 Replies)
Discussion started by: Zarnick
5 Replies
3. Shell Programming and Scripting
Im trying to execute the below command on our server to list files and replace the newline in the file list with spaces, but the character 'n' is getting replaced with a space, is there any environment variable that needs to be set in UNIX?
sh -c 'ls -trx... (1 Reply)
Discussion started by: rameshrr3
1 Replies
4. UNIX for Advanced & Expert Users
Hi Gurus,
I tried FTP one file to UNIX which got values like
wel^come
If I see the content in unix, it shows like
wel^Zcome
^ coverted into ^Z (Control + Z )
Can someone please share what is happening here?
Thanks,
Shahnaz (5 Replies)
Discussion started by: shahnazurs
5 Replies
5. Shell Programming and Scripting
Hi,
I have a really simple script which I want to run forever, inside the loop it runs a C application which if it exits should restart.
#!/bin/sh
while true
do
./SCF scf.conf >> scf.log
sleep 2
done
For some reason the SCF C application coredumps and the script is exiting.... (3 Replies)
Discussion started by: marvinwright
3 Replies
6. Shell Programming and Scripting
Hi,
I need to count number of '$' symbol in a file and assign it to a variable.
I am using below command.
grep -c '\$' inputfile
O/p:
10359
Its giving correct o/p but when I am assigning the same to a variable its giving completely different o/p.
ab1=`grep -c '\$' inputfile`
$... (3 Replies)
Discussion started by: Opamps123
3 Replies
7. Shell Programming and Scripting
Hi guys,
I'm back to get some help again :)
I have a file that has a list of IP addresses, and I use nslookup in my script to resolve hostnames of those IPs.
the problem I'm facing is that I not all the hostnames got resolved! and I don't know why. sometimes the same duplicate IP returns a... (8 Replies)
Discussion started by: Abdulelah
8 Replies
8. Emergency UNIX and Linux Support
Hi all
Nslookup command returns!!!!
Code:
nslookup 10.91.44.29
Server: 127.0.0.1
Address: 127.0.0.1#53
29.44.91.in-addr.arpa name = station1.example.com
Code:
nslookup station1.example.com
Server: 127.0.0.1
Address: 127.0.0.1#53
Name: ... (4 Replies)
Discussion started by: anishkumarv
4 Replies
9. Shell Programming and Scripting
Hi,
Immediate help on below will be appreciated.
I have to read a file (max of 10MB) which will have no new line characters, i.e. data in single line. and have to inster '\n' at every 100 characters. and if record starts with 'BUCA' then need to pick value of length 10 at position 71 and... (7 Replies)
Discussion started by: maks475
7 Replies
10. UNIX for Advanced & Expert Users
Can anyone explain why wc is behaving weirdly? Their are only 2 occurrences but wc thinks their are 7 occurrences. I have even manually checked this.
$ grep -i base *
lit: base xx
lit.lst:003- 00103 BASE XX
$ grep -i base * | wc -w ... (2 Replies)
Discussion started by: cokedude
2 Replies
LEARN ABOUT DEBIAN
net::nslookup
Net::Nslookup(3pm) User Contributed Perl Documentation Net::Nslookup(3pm)
NAME
Net::Nslookup - Provide nslookup(1)-like capabilities
SYNOPSIS
use Net::Nslookup;
my @addrs = nslookup $host;
my @mx = nslookup(type => "MX", domain => "perl.org");
DESCRIPTION
"Net::Nslookup" provides the capabilities of the standard UNIX command line tool nslookup(1). "Net::DNS" is a wonderful and full featured
module, but quite often, all you need is `nslookup $host`. This module provides that functionality.
"Net::Nslookup" exports a single function, called "nslookup". "nslookup" can be used to retrieve A, PTR, CNAME, MX, NS, SOA, and TXT
records.
my $a = nslookup(host => "use.perl.org", type => "A");
my @mx = nslookup(domain => "perl.org", type => "MX");
my @ns = nslookup(domain => "perl.org", type => "NS");
my $name = nslookup(host => "206.33.105.41", type => "PTR");
"nslookup" takes a hash of options, one of which should be term, and performs a DNS lookup on that term. The type of lookup is determined
by the type argument. If server is specified (it should be an IP address, or a reference to an array of IP addresses), that server(s) will
be used for lookups.
If only a single argument is passed in, the type defaults to A, that is, a normal A record lookup.
If "nslookup" is called in a list context, and there is more than one address, an array is returned. If "nslookup" is called in a scalar
context, and there is more than one address, "nslookup" returns the first address. If there is only one address returned, then, naturally,
it will be the only one returned, regardless of the calling context.
domain and host are synonyms for term, and can be used to make client code more readable. For example, use domain when getting NS records,
and use host for A records; both do the same thing.
server should be a single IP address or a reference to an array of IP addresses:
my @a = nslookup(host => 'example.com', server => '4.2.2.1');
my @a = nslookup(host => 'example.com', server => [ '4.2.2.1', '128.103.1.1' ])
By default, when doing CNAME, MX, and NS lookups, "nslookup" returns names, not addresses. This is a change from versions prior to 2.0,
which always tried to resolve names to addresses. Pass the recurse => 1 flag to "nslookup" to have it follow CNAME, MX, and NS lookups.
Note that this usage of "recurse" is not consistent with the official DNS meaning of recurse.
# returns soemthing like ("mail.example.com")
my @mx = nslookup(domain => 'example.com', type => 'MX');
# returns soemthing like ("127.0.0.1")
my @mx = nslookup(domain => 'example.com', type => 'MX', recurse => 1);
SOA lookups return the SOA record in the same format as the `host` tool:
print nslookup(domain => 'example.com', type => 'SOA');
dns1.icann.org. hostmaster.icann.org. 2011061433 7200 3600 1209600 3600
TIMEOUTS
Lookups timeout after 15 seconds by default, but this can be configured by passing timeout => X to "nslookup".
DEBUGGING
Pass debug => 1 to "nslookup" to emit debugging messages to STDERR.
AUTHOR
darren chamberlain <darren@cpan.org>
perl v5.12.4 2011-08-15 Net::Nslookup(3pm)