July 25, 2008 12:42pm pdt

1. tliotta 45,635
2. murphey2 21,614
3. Gary_Th... 17,475
4. _b_h 15,060
5. daveslash 11,000
6. daveslater 7,999
7. rward 7,350
8. Kdo 4,540
9. momi_sa... 3,500
10. mark_wills 2,500
11. bggauth 2,200
12. frankytee 2,000
12. Infinity08 2,000
12. jerryscole 2,000
15. LewisPo... 1,200
15. dfke 1,200
15. ajut400 1,200

1. tliotta 99,614
2. _b_h 32,373
3. murphey2 23,914
4. daveslash 21,052
5. Gary_Th... 17,475
6. daveslater 15,627
7. rward 10,100
8. bggauth 5,575
9. Kdo 4,940
10. momi_sa... 4,300
11. shalomc 3,370
12. WaldenL 2,900
13. mark_wills 2,500
14. twahelpd... 2,450
15. Muflone 2,240

04.08.2007 at 08:54AM PDT, ID: 22498601

	[x] Attachment Details

[x]

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7.6

PING resolves wrong IP address, DNS Cache entry is wrong on a multi-homed domain controller

Zones: AS / 400, Windows 2003 Server, Domain Name Service (DNS)

Tags: wrong, ip, dns, address, ping

Hello,

I am having difficulty trying to get my head around something with regards to name resolution and PING.

In particular, I have an incorrect entry in the DNS Cache on the machine in question and ping seems to resolve the name to the wrong IP. This name resolution problem is causing some headaches on the domain.

I have I Series AS/400 with integrated Windows Server card. Windows 2003 R2 SP1 is installed and is a DC and holds the FSMO roles. There are 3 other DCs on the network although this is the PDC. For those not familiar with this setup, these boxes have an internal token ring network that allows OS/400 and Windows to communicate directly. The network topology of the box is as follows:

I5 AS/400 Box:
_____________________________________
| OS/400 Windows |
| |
| Int. NIC Int.NIC |
| 192.168.3.11------><----------192.168.3.12 |
| host: I5 Host I5Win |
| |
| Ext NIC Ext NIC |
| 192.168.1.12 192.168.1.11 |
| | | |
| V V |
-----------------Lan-------------------

Just for note, the external NICs are paired Gigabit adapters (INTEL Pro1000) if that makes any difference

The windows NIC DNS server entry is pointed to itself (192.168.1.11) and everything works as expected if you try to resolve any names using the FQDN. "Append Suffix" is set and is set to the local domain.

However for some reason, if you dump the DNS Cache you get:

i5win
----------------------------------------
Record Name . . . . . : I5WIN
Record Type . . . . . : 1
Time To Live . . . . : 573152
Data Length . . . . . : 4
Section . . . . . . . : Answer
A (Host) Record . . . : 192.168.3.11

Record Name . . . . . : I5WIN
Record Type . . . . . : 1
Time To Live . . . . : 573152
Data Length . . . . . : 4
Section . . . . . . . : Answer
A (Host) Record . . . : 192.168.1.11

qi5
----------------------------------------
Record Name . . . . . : QI5
Record Type . . . . . : 1
Time To Live . . . . : 573152
Data Length . . . . . : 4
Section . . . . . . . : Answer
A (Host) Record . . . : 192.168.3.11

It's not that I wouldn't expect two entries, and in fact, I need to clean up the DNS records on a reboot as typically the 3.12 address registers itself even though I have set *not* to. But why and how is 3.11 getting into this local machines cache as I5Win?

This is driving me insane. Is there any way to remove this entry from the cache? flushing has no effect. Using NSLookup retrieves the correct results.

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Question Stats

Zone: OS

Question Asked By: SilentExpert

Solution Provided By: Computer101

Participating Experts: 3

Solution Grade: A

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