SCOUG-HELP Mailing List Archives

<< Previous Message << >> Next Message >>

Date:	Thu, 15 Apr 2004 23:29:06 PDT7
From:	Peter Skye <pskye@peterskye.com >
Reply-To:	scoug-help@scoug.com
To:	scoug-help@scoug.com
Subject:	SCOUG-Help: NSLOOKUP help please

Content Type: text/plain

=====================================================
If you are responding to someone asking for help who
may not be a member of this list, be sure to use the
REPLY TO ALL feature of your email program.
=====================================================

Hiya Jeff,

You pinged a dotted IP address. You need to ping a domain name, so that
PING will first go to the DNS to "resolve" the domain to its dotted IP
address.

You can't do this test with NSLOOKUP because nslookup _always_ goes to
the DNS, either to look up a domain's dotted IP address _or_ to look up
a dotted IP address's domain name. Thus, if the DNS isn't working,
nslookup will always fail.

PING will work one way but not the other if the DNS isn't responding,
thus it's a quick way to see if your DNS is working. I prefer PING
rather than using telnet/smtp/http for this test because PING just
checks if the target TCP/IP stack is working and doesn't care if there's
an appropriate server running on the target machine. There are a few
sites which block ping requests but in general it works quite nicely.

- Peter

Dr. Jeffrey Race wrote:
>
> =====================================================
> If you are responding to someone asking for help who
> may not be a member of this list, be sure to use the
> REPLY TO ALL feature of your email program.
> =====================================================
>
> On Thu, 15 Apr 2004 17:38:33 PDT7, Peter Skye wrote:
> >Dr. Jeffrey Race wrote:
> >> when I run [NSLOOKUP] from my shiny
> >> new eCS 1.1, I receive error message
> >> [H:\MPTN\BIN]NSLOOKUP
> >> *** Can't find server name for address 192.168.254.254: Non-existent
> host/domain
> >>
> >> *** Default servers are not available
> >>
> >> What should I do please?
> >Off hand, it looks like NSLOOKUP can't find a DNS where it can look up
> >the domain or dotted IP. The 192.168.254.254 looks like it might be
> >your firewall.
> >Can you PING the domains that you want to NSLOOKUP?
>
> [H:\]nslookup 63.251.137.21
> *** Can't find server name for address 192.168.254.254: Non-existent host/domain
>
> *** Default servers are not available
>
> [C:\BAT]ping 63.251.137.21
> PING 63.251.137.21: 56 data bytes
> 64 bytes from 63.251.137.21: icmp_seq=0. time=30. ms
> 64 bytes from 63.251.137.21: icmp_seq=1. time=20. ms
>
> =====================================================
>
> To unsubscribe from this list, send an email message
> to "steward@scoug.com". In the body of the message,
> put the command "unsubscribe scoug-help".
>
> For problems, contact the list owner at
> "rollin@scoug.com".
>
> =====================================================

=====================================================

To unsubscribe from this list, send an email message
to "steward@scoug.com". In the body of the message,
put the command "unsubscribe scoug-help".

For problems, contact the list owner at
"rollin@scoug.com".

=====================================================

Return to [ 15 | April | 2004 ]

SCOUG, Warp Expo West, and Warpfest are trademarks of the Southern California OS/2 User Group. OS/2, Workplace Shell, and IBM are registered trademarks of International Business Machines Corporation. All other trademarks remain the property of their respective owners.