Microsoft Loopback Adapter ping failed

I have a laptop and a desktop both running XP Pro SP2. I followed the instructions to install Microsoft Loopback adapter as part of the Oracle installation.
On the desktop, I successfully installed Microsoft Loopback adapter. I was able to ping the IP and host name of the loopback adapter and everything works fine.
On the laptop, I installed the Microsoft Loopback adapter. I cannot ping the Microsoft loopback adapter's host or IP. I can ping localhost and external internet hosts/IP.
Any ideas?

Madrid,
Thank you very much for your help. On my laptop, I have Norton Internet Security (NIS) and there was a firewall rule blocking the traffic.
This problem is now resolved.
Thanks for your help, Madrid.

Similar Messages

Microsoft Loopback Adapter

Hello,
I need help with configuring MS Loopback Adapter. I am trying to setup Oracle 11g r2 on my Windows 7 Professional laptop which is not connected to any network. There is no virtual network like VMWare either. I followed the instructions in the Oracle release notes but the loopback adapter still says "No Network Access"
The Device Manager for the adapter says, "This device is working properly"
C:\Windows\system32>ipconfig/all
Windows IP Configuration
Host Name . . . . . . . . . . . . : P7One
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
Ethernet adapter Local Area Connection 2:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft Loopback Adapter
Physical Address. . . . . . . . . : 02-00-4C-4F-4F-50
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
IPv4 Address. . . . . . . . . . . : 10.10.10.10(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . :
NetBIOS over Tcpip. . . . . . . . : Disabled
Control Panel>>System shows:
Computer Name: P7One
Full Computer Name: P7One
My laptop is not on any domain. I edited the hosts file as follows:
10.10.10.10 P7One P7One
Network Connections>>Local Area Connection 2
Properties:
I check IPv4 and unchecked everything else.
IPv4 Properties>>Advanced>>WINS
I disabled NetBIOS over TCP/IP <--------- Not sure if this was required.
I disable all other Network connections like Bluetooth and Wireless while trying to use MS Loopback Adapter but the Local Area Connection 2 Status dialog box says:
IPv4 Connectivity: No Network Access
IPv6 Connectivity: No Network Access
Media State: Enabled
Duration: 00:00:00
Speed: 10 Mbps
Activity:
Packets sent: 31. Received:0
Please help me out here. Thank you!

DBCA again failed during reinstallation of Oracle with the following error messages:
DIM-00019
OS-1053
ORA-12560
INS-20802
The description of these messages are 3 posts above in this thread.
Updated cmd results after reinstallation:
C:\Windows\system32>ping p7one
Pinging P7One [10.10.10.10] with 32 bytes of data:
Reply from 10.10.10.10: bytes=32 time<1ms TTL=128
Reply from 10.10.10.10: bytes=32 time<1ms TTL=128
Reply from 10.10.10.10: bytes=32 time<1ms TTL=128
Reply from 10.10.10.10: bytes=32 time<1ms TTL=128
Ping statistics for 10.10.10.10:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms
C:\Windows\system32>lsnrctl start
LSNRCTL for 32-bit Windows: Version 11.2.0.1.0 - Production on 21-MAY-2011 13:24
:27
Copyright (c) 1991, 2010, Oracle. All rights reserved.
TNS-01106: Listener using listener name LISTENER has already been started
C:\Windows\system32>lsnrctl status
LSNRCTL for 32-bit Windows: Version 11.2.0.1.0 - Production on 21-MAY-2011 13:24
:46
Copyright (c) 1991, 2010, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1521)))
STATUS of the LISTENER
Alias LISTENER
Version TNSLSNR for 32-bit Windows: Version 11.2.0.1.0 - Produ
ction
Start Date 21-MAY-2011 13:18:30
Uptime 0 days 0 hr. 6 min. 19 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File D:\app\P7\product\11.2.0\dbhome_1\NETWORK\ADMIN\listen
er.ora
Listener Log File d:\app\p7\diag\tnslsnr\P7One\listener\alert\log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(PIPENAME=\\.\pipe\EXTPROC1521ipc)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=127.0.0.1)(PORT=1521)))
Services Summary...
Service "CLRExtProc" has 1 instance(s).
Instance "CLRExtProc", status UNKNOWN, has 1 handler(s) for this service...
The command completed successfully
C:\Windows\system32>lsnrctl service
LSNRCTL for 32-bit Windows: Version 11.2.0.1.0 - Production on 21-MAY-2011 13:25
:56
Copyright (c) 1991, 2010, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1521)))
Services Summary...
Service "CLRExtProc" has 1 instance(s).
Instance "CLRExtProc", status UNKNOWN, has 1 handler(s) for this service...
Handler(s):
"DEDICATED" established:0 refused:0
LOCAL SERVER
The command completed successfully
C:\Windows\system32>
Please note that it is still not using 10. address.
C:\Windows\system32>sqlplus
SQL*Plus: Release 11.2.0.1.0 Production on Sat May 21 13:34:41 2011
Copyright (c) 1982, 2010, Oracle. All rights reserved.
Enter user-name: / as sysdba
ERROR:
ORA-12560: TNS:protocol adapter error
Enter user-name:
I believe I have not been able to successfully configure MS Loopback Adapter.
In Control Panel >> Network Connections it is still showing:
Local Area Connection 2
Unidentified Network
Microsoft Loopback Adapter
No Network Access
Edited by: 859535 on May 21, 2011 10:40 AM

How to Configure Microsoft loopback adapter in windows 2008

Hi all,
I am trying to install SAP IDES 6.0..... while i m trying to install it , it is asking forUnlimited Strength Jurisdiction Policy Files at runtime.
I do have local and US policy jar file, but i guess its asking for JCE extension file, i dont know about it. so i m not able to proceed
further. it gives osme error about local host. i think its about Microsoft loopback adapter. can anyone have idea abt it.How to
Configure Microsoft loopback adapter in windows 2008?
Can anyone help me ASAP coz i m stucked like anythng.
thanks
Cheers

Hi vinay
Thanks for reply...I m Installing SAP IDES...with DB2
I have upload JCE zip file...after clicking next button i m getting following Errors,
ERROR 2014-10-02 09:52:29
MOS-01185 The subkey 'HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\DPS' does not exist on the 'localhost' host.
ERROR 2014-10-02 09:52:29
FCO-00011 The step collect with step key |NW_Onehost|ind|ind|ind|ind|0|0|NW_Onehost_System|ind|ind|ind|ind|1|0|NW_GetSidNoProfiles|ind|ind|ind|ind|2|0|collect was executed with status ERROR .
i guess its about Loopback adapter configuration. Still i m not sure... DO u have any idea about it.
How i can get rid of it.
Thanks

How to install Microsoft Loopback Adapter

I want to install the Microsoft Lookback Adapter in Windows 7. I have done this under Vista either via:
1) Control Panel, Classic View, Add Hardware
2) Device Manager, right click on root node and select Add Legacy Hardware
I can't find the equivalent under Windows 7 - any suggestions?
Thanks!

I have a video that covers the steps to install the Microsoft Loopback Adapter in Windows 7. Hope this helps...
http://www.youtube.com/watch?v=R9674zGHxrE
Guides and tutorials, visit
ITGeared.com.

How to configue "Microsoft Loopback Adapter" ?

Hi,
I have Oracle 11GR1,Win XP. with DHCP enabled.
My conputer gets dynamic IP on connection to internet, so i want to install "*Microsoft Loopback Adapter*".
For that i visited this link:
http://download.oracle.com/docs/cd/B1930601/install.102/b14316/reqs.htm#BABGHEFB_
There, in section 2.4.5.3, Installing a Loopback Adapter on Windows 2003 or Windows XP,
step 20,they said to edit host file.
In this step i have some confusion:
>For example:
>10.10.10.10 mycomputer.mydomain.com mycomputer
What to write in above line in place of mydomain.com ?In above example mycomputer is the computer name.In my case
my computer name is user-5ef511de5
so , i wrote
10.10.10.10 user-5ef511de5 user-5ef511de5
This gave unexpected behaviour. That i was unable to connect on DB through any tool.
Please tell what exactly to write in that host file ?
My computer in standalone computer that frequently gets connected to internet via dial up connection.

bootstrap wrote:
How're you using oracle's own sqlplus? Are you able to connect to the database using cmd--> sqlplus "<username>/<password>@<tns alias>?
Yes
LSNRCTL> status
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1521)))
STATUS of the LISTENER
Alias LISTENER
Version TNSLSNR for 32-bit Windows: Version 11.1.0.6.0 - Production
Start Date 28-NOV-2010 08:37:44
Uptime 0 days 0 hr. 15 min. 52 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File D:\app\shyam\product\11.1.0\db_1\network\admin\listener.ora
Listener Log File d:\app\shyam\diag\tnslsnr\shyam-5ef511de5\listener\alert\log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(PIPENAME=\\.\pipe\EXTPROC1521ipc)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=127.0.0.1)(PORT=1521)))
The listener supports no services
The command completed successfully
TNSNAMES.ORA:
EARTH =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = EARTH)
)Now, how do you think a connection is going to be established when your listener supports no services??
You may try this:
1. Make a static entry in listener for your database
or
2. Wait for sometime, so that pmon automatically registers the instance with listener
or
3. fire the command: sqlplus > alter system register;
Regards,
S.K.

Do i really need to install Microsoft Loopback Adapter ?

i am installing oracle 10g on windows xp proffessional + AMD sempron 3100+
when started oracle universal installer, i received a warning like following :
DHCP configuration detected , you need to configure ur primary loopback adapter to MICROSOFT LOOPBACK ADAPTER
i m using belkin wireless card to connect to internet and i dont need to change it anyway.
please someone suggest me : whether i shud continue with this warning OR do i need something more before installing oracle 10g ???
thanks in advance,
-imranmca

I have Windows XP professional SP2 with a static ip address of my internal lan.
The installation don't pass the check about lan with the same message as you
"DHCP configuration detected , you need to configure ur primary loopback adapter to MICROSOFT LOOPBACK ADAPTER". Why?
I followed the instructions and now is all working adding in the hosts file 2 lines and not only one:
IP_addr computer_name.domain computer_name
IP_addr sid_name.domain sid_name
I'm not convinced of my euristic solution... can someone explain me why i have to configure the microsoft loopback adapter when i don't have a dhcp configuration?

Why Microsoft Loopback Adapter in SAP Installation ?

Hello Gurus
Please Tell Me The Concept of Microsoft Loopback Adapter ?
Why we are using this when we install SAP ?
Please Suggest Any Hyperlink Or Document Where we are going to Get The Information on This
Thank You

Hi Srinivas,
If loopback adapter is not installed on your system then it not able to go inside the \\<hostname>\sapmnt or saploc directory.
Moreover SAP engine requires a LAN adapter to function properly and since sapmnt is shared folder it will get accessed while network is available.
Check the below link
http://www.stechno.net/sap-notes.html?view=sapnote&id=698014
With Regards
Ashutosh Chaturvedi

About the microsoft loopback adapter settings

In the minisap setup process, when I use the recommended loopback setting and change the ip to 10.10.0.10 and also change the host file.
But If I do this , it's really slow for my minisap to run~~~
So I just change the ip to local host (127.0.0.1)again, then the minisap run much faster?
Would anyone give me some sugestions about how this happened?

Hi,
Check below links for information:
<a href="http://www.microsoft.com/technet/prodtechnol/virtualserver/2005/proddocs/vs_operate_using_loopback.mspx?mfr=true">http://www.microsoft.com/technet/prodtechnol/virtualserver/2005/proddocs/vs_operate_using_loopback.mspx?mfr=true</a>
<a href="http://www.kbalertz.com/Feedback.aspx?kbNumber=236869">http://www.kbalertz.com/Feedback.aspx?kbNumber=236869</a>
Regards,
Subhasha Ranjan
Reward points if helpful.

Using MS Loopback Adapter

Hi, I am running 10g at home on Windows XP Pro. I have installed 2 network connections, one for home internet (DHCP) and another one created with Microsoft Loopback Adapter for running Enterprise Manager.
To run EM, I have to disable the DHCP connection and enable Loopback Adapter. Is there a way to be able to run EM even with both connections enabled? Thanks.

Assuming you set a specific IP address for the loopback adapter, you should be able to specify that IP address in the URL (or an entry in your hosts file that resolves to that IP address) while both connections are active.
Justin

Multicasting problem with MS Loopback Adapter

          My IBM software dispatcher requires Microsoft Loopback Adapter on my Application Servers.
          Unfortunatly, multicasting does not work with MS Loopback Adapter. I am running WebLogic
          6.1 on Windows 2000 Application Server. Is this a known problem? Has it been fixed
          in a Service Pack? Is there a way around it?
          Thanks in advance,
          Guylaine.


          Installing Service Pack 2 for Windows 2000 AS fixed the problem.
          Guylaine.

Why oracle 11g needs loopback adapter???

Hi
i have installed obi11g on my windows 32.
initially i couldnt install as microsoft loopback adapter wasnt configured on my system...
but after configuring loopback adapter on my system i am able to successfully installl.
my question is that why oracle need microsoft loopback adapter,
even though i hav manually assigned the ip address in the network configuration. tcp ip settings..
plz help guys

hi mahis,
my question is that why oracle need microsoft loopback adapterIts a pre-requisite for OBIEE 11g to call the IP of the host file.It is defined that way,you can go through the documentation for it.
mahis,please mark points to your previous threads and close it along with this.Follow rules http://forums.oracle.com/forums/ann.jspa?annID=939
By,
KK

Why do i need the Microsoft Loopback Adaptor on XP

I just received a new PC running XP pro at work. This new PC replaced my old PC running win 2k. I installed XE as a domain user and it installed and ran without any issues. Now i try to install XE on XP pro and the listener will not start for port 8080 or any other port. Why would this new PC have this problem? Both PCs are configured to use DHCP.
Thanks,
Christopher

Hi
Please have a look into the following to understand Loopback Adapter and DHCP:
What is a Loopback Adapter?
The Microsoft Loopback adapter is a testing tool for a virtual network environment where network access is not available. Also, you must use the Loopback adapter if there are conflicts with a network adapter or with a network adapter driver. You can bind network clients, protocols, and other network configuration items to the Loopback adapter, and you can install the network adapter driver or network adapter later while retaining the network configuration information. The Loopback adapter is a useful tool for testing the configuration of network protocols such as TCP/IP on a local system when you don't have a network card.
DHCP is a protocol used by networked computers (clients) to obtain IP addresses and other parameters such as the default gateway, subnet mask, and IP addresses of DNS servers from a DHCP server. It facilitates access to a network because these settings would otherwise have to be made manually for the client to participate in the network.
The DHCP server ensures that all IP addresses are unique, that is, no IP address is assigned to a second client while the first client's assignment is valid (its lease has not expired). Thus IP address pool management is done by the server
The Dynamic Host Configuration Protocol (DHCP) automates the assignment of IP addresses, subnet masks, default gateway, and other IP parameters. The assignment occurs when the DHCP-configured machine boots up or regains connectivity to the network. The DHCP client sends out a query requesting a response from a DHCP server on the locally attached network. The query is typically initiated immediately after booting up and before the client initiates any IP based communication with other hosts. The DHCP server then replies to the client with its assigned IP address, subnet mask, DNS server and default gateway information.
The assignment of the IP address generally expires after a predetermined period of time, at which point the DHCP client and server renegotiate a new IP address from the server's predefined pool of addresses. Typical intervals range from one hour to several months, and can, if desired, be set to infinite (never expire). The length of time the address is available to the device it was assigned to is called a lease, and is determined by the server.
DHCP is intended for client PCs, not servers. It also suggests when DHCP is suitable: when there are lots of client machines to be configured So if you work in the server room of a corporation, you may well think that you have a large number of servers which need IP addresses to be allocated... but generally, for most corporate networks, the number of servers will be relatively small. And they also tend to all be physically co-located in one, large, rather chilly, server room. There is therefore no need for servers to have dynamically-assigned IP addresses.
One more way to understand DHCP: DHCP is a protocol that lets network administrators centrally manage and automate the assignment of IP Addresses on the corporate network. When a company sets up its computer users with a connection to the Internet, an IP address must be assigned to each machine. Without DHCP, the IP address must be entered manually at each computer .
The key features of DHCP are listed as central management of IP addresses.
-Priya

Installing a Loopback adapter without a Domain Name

Im trying to install the microsoft loopback adapter for the oracle 10g database. In one of the steps I was supposed to configure the "hosts" file within the driver directory of the windows folder.
Below is the precise directions... I dont have a domain name, I just have a internet service that gives me a dynamic IP address... what do I do?
Add a line to the SYSTEM_DRIVE:\WINDOWS\system32\drivers\etc\hosts file with the following format, after the localhost line:
IP_address hostname.domainname hostname
where:
IP_address is the non-routable IP address you entered in step 16.
hostname is the name of the computer.
domainname is the name of the domain.
For example:
10.10.10.10 mycomputer.mydomain.com mycomputer

Make one up.
Or not.
The domain name in the /etc/hosts is optional.
Since you use /etc/hosts, you are not using a DNS server for that specific interpretation. Therefore you can use whatever you want. I'd use something like 'glomph.tst' just so I can have thje joy of typing that in the browser URL box.

TNS-12538: TNS:no such protocol adapter, and install MS loopback adapter

Hello,
I am trying to install oracleAS Infrastructure and portal on my windows xp pc. (Oracle Application Server 10g Release 2 (10.1.2)
At some point of the installation for Internet Directory Configuration Assistant, there is an error:
===========================================================
Output generated from configuration assistant "Internet Directory Configuration Assistant" (attempt 2):
Myinfra.mypcname.domainname
java.sql.SQLException: Io exception: The Network Adapter could not establish the connectionat oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:137)
===========================================================
After did some searching, I find I may need to install MS loopback adapter.
So I followed http://support.microsoft.com/kb/839013 to install the MS Loopback adapter.
After I installed, When I open the Network Connetcions, I found there are two local area connetcions. One of then called local area connection 2, and it's MS loopback adapter. I got a warning for local area connection 2, it says that my pc does not have a IP address assigned, and its status is : limited or no connectivity .
I tried to repair to establish the full connection by clicking on the repair button, but the process is failed.
I also tried to run command: tnsping orcl ( orcl is my database service name ), after installed the loopback adapter.
tnsping orcl, still got this error:
======================================================
C:\>tnsping orcl
TNS Ping Utility for 32-bit Windows: Version 9.0.1.4.1 - Production on 16-MAR-20
06 22:41:35
Copyright (c) 1997 Oracle Corporation. All rights reserved.
Used parameter files:
E:\oracle\product\10.1.0\Db_1\network\admin\sqlnet.ora
Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST =mypcname.mydomainname)(PORT = 1521)) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = orcl)))
TNS-12538: TNS:no such protocol adapter
===================================================
btw. my pc IP was assigned by DHCP, and pc host name is something like: abcd.abc.edu
Q1. I am wondering which local area connection is currently used by default ? If it's the old one, how to configure it to use the new added one? ( local area connetcion 2 ).
Q2. Do I have to install MS Loopback adapter for installing Oracle Application Server 10g Release 2 (10.1.2)?
I don't have a fixed IP, however my IP is seldom changed. And I'm ok with 127.0.0.1
Any suggestion ?
Thanks for your reply,
Emily

Hello,
I am trying to install oracleAS Infrastructure and portal on my windows xp pc. (Oracle Application Server 10g Release 2 (10.1.2)
At some point of the installation for Internet Directory Configuration Assistant, there is an error:
===========================================================
Output generated from configuration assistant "Internet Directory Configuration Assistant" (attempt 2):
Myinfra.mypcname.domainname
java.sql.SQLException: Io exception: The Network Adapter could not establish the connectionat oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:137)
===========================================================
After did some searching, I find I may need to install MS loopback adapter.
So I followed http://support.microsoft.com/kb/839013 to install the MS Loopback adapter.
After I installed, When I open the Network Connetcions, I found there are two local area connetcions. One of then called local area connection 2, and it's MS loopback adapter. I got a warning for local area connection 2, it says that my pc does not have a IP address assigned, and its status is : limited or no connectivity .
I tried to repair to establish the full connection by clicking on the repair button, but the process is failed.
I also tried to run command: tnsping orcl ( orcl is my database service name ), after installed the loopback adapter.
tnsping orcl, still got this error:
======================================================
C:\>tnsping orcl
TNS Ping Utility for 32-bit Windows: Version 9.0.1.4.1 - Production on 16-MAR-20
06 22:41:35
Copyright (c) 1997 Oracle Corporation. All rights reserved.
Used parameter files:
E:\oracle\product\10.1.0\Db_1\network\admin\sqlnet.ora
Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST =mypcname.mydomainname)(PORT = 1521)) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = orcl)))
TNS-12538: TNS:no such protocol adapter
===================================================
btw. my pc IP was assigned by DHCP, and pc host name is something like: abcd.abc.edu
Q1. I am wondering which local area connection is currently used by default ? If it's the old one, how to configure it to use the new added one? ( local area connetcion 2 ).
Q2. Do I have to install MS Loopback adapter for installing Oracle Application Server 10g Release 2 (10.1.2)?
I don't have a fixed IP, however my IP is seldom changed. And I'm ok with 127.0.0.1
Any suggestion ?
Thanks for your reply,
Emily

Windows 2008 R2 - Question About Loopback Adapter

Hello,
I have the following situation:
I have two Windows Server 2008 R2 Enterprise with Service Pack 1.
I use a load balancer (Radware Alteon) in DSR mode, to load balance traffic for between these servers.
To use DSR, I have to configure a loopback adapter on each of the, with the IP address of the VIP that is configured on the load balancer.
Everything is working ok, the adapter is recognizing the network and traffic is being loadbalanced perfectly.
The issue starts here:
I also configure a health check on the load balancer, so it can check the health of the server, and stop forwarding traffic to a server when it fails.
One of the failure conditions, is when the loopback adapter fails.
When the physical adapter fails, it is easy to recognize, because the health check, on its basic, is sent to the IP address and MAC address of the physical NIC of the server.
When it is not responding, the server is considered as failed.
However, to recognize a failure of the loopback adapter, the health check is being sent to the IP address of the loopback adapter (that is the VIP) and to the MAC address of the physical NIC.
The load balancer is doing that perfectly and the health checks are passed when the loopback is up.
However, when we simulate a loopback failure, by disabling it, the load balancer does not recognize the failure.
Instead, we just see, in the load balancer statistics, that the server response time is very high (more than 3500000 ms) but the server is up.
The check that we use is a simple ICMP ping request, and we are expecting an ICMP reply withing the specified configured period of time (that is, the timeout).
We started a sniffer catpure on the switch connected to the server.
We saw the following behavior:
When the loopback is disabled, the server still replies to the ICMP requests, but with ICMP redirect (redirect for network)
The ICMP redirect message is sent fromt the source IP address and MAC of the physical NIC.
Then, another ICMP request is sent, and here is also a weird behavior:
The request is sent from the source IP address of the load balancer and source MAC of the server, destination IP address of the loopback adapter (that is the VIP) and destination MAC of the load balancer.
It is clear that this ICMP request is from the same "ICMP session" that was just sent, because it is being sent milliseconds after the first request and ICMP redirect reply. It is not a new health check, because a new health check will be sent after
the interval configured (5 seconds after the first ICMP request).
I don't know if this request is being sent from the server, which means that it spoofs a request from the load balancer by using its IP address as the source, or is it a request being sent from the load balancer, which means it spoofs a request from the server
by using its MAC address as the source.
My question is, if anyone saw such behavior of:
1.) ICMP redirect from the server on Windows 2008 R2 when the loopback is disabled.
2.) A seconds request within the same timeframe of the first request, not a part of a second health check.
I configued the loopback adapter properly, with the weakhostsend and weakhostreceive enabled, and with forwarding enabled (using netsh).
I tested the same topology with Windows Server 2003 Enterprise Edition Service Pack 2.
On this OS, when the loopback is disabled, it just not sending an ICMP reply at all.
Thanking in advance, Udi Dahan.

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Microsoft Loopback Adapter ping failed

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