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Question
Saturday, April 24, 2010 12:37 PM
Hello,
I have Servers on 10.72.0.0 network and clients are on different network i.e. 10.80.0.0. Even clients are on different subnets based on their departments and workload. The problematic server is hosted on Hyper-V. But other servers on Hyper-V are not behaving like this.
One of my server is unable to ping clients. Though clients are able to ping Server. This is happening on one server only, rest of servers are fine and able to ping clients. Even when i am pinging same subnet server i am getting this
C:\ping mailstore
Pinging mailstore.abc.com [10.72.0.91] with 32 bytes of data:
Reply from 10.72.0.91: bytes=32 time=303632ms TTL=128
Reply from 10.72.0.91: bytes=32 time=303632ms TTL=128
Reply from 10.72.0.91: bytes=32 time=303631ms TTL=128
Reply from 10.72.0.91: bytes=32 time=303631ms TTL=128
Ping statistics for 10.72.0.91:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 303631ms, Maximum = 303632ms, Average = 303631ms
C:\
Please help.
All replies (12)
Tuesday, April 27, 2010 1:06 PM ✅Answered
Hi ,
sorry for confusion, you can omit the above method.
I would check few things with respect to hyper-v
make sure the guest OS has single CPU.
make use of /usepmtimer switch in boot.ini , you can follow the below link
http://support.microsoft.com/kb/895980
Sunday, April 25, 2010 10:45 PM
Hello,
make sure no firewall is blocking ICMP protocol on the server, which mostly is set by default.
Best regards Meinolf Weber Disclaimer: This posting is provided "AS IS" with no warranties, and confers no rights.
Monday, April 26, 2010 2:46 AM
Hello,
make sure no firewall is blocking ICMP protocol on the server, which mostly is set by default.
Best regards Meinolf Weber Disclaimer: This posting is provided "AS IS" with no warranties, and confers no rights.
Meinolf, firewall is off and server is windows 2003.
Tuesday, April 27, 2010 7:43 AM
Hi Hasan,
What is the outpu of ping localhost ?
When did it stopped working ?,
What happen to file shares , can the client be able to access the file shares and vice versa ?, also try to establish RDP from server to client
Make sure you reboot the server in safe mode with networking and test the behavior
Test the behavior by changing the switch port
Update the NIC drivers to the latest , if you can , try replacing the NIC card
Finally a Netmon trace / wireshark trace would give you more information , make sure the client is sending packet to DG , if not there is problem related to either switch port or at the OS level.
Tuesday, April 27, 2010 9:18 AM
Hi Hasan,
What is the outpu of ping localhost ?
When did it stopped working ?,
What happen to file shares , can the client be able to access the file shares and vice versa ?, also try to establish RDP from server to client
Make sure you reboot the server in safe mode with networking and test the behavior
Test the behavior by changing the switch port
Update the NIC drivers to the latest , if you can , try replacing the NIC card
Finally a Netmon trace / wireshark trace would give you more information , make sure the client is sending packet to DG , if not there is problem related to either switch port or at the OS level.
The output of localhost as well as other hosts is
Z:\ping localhost
Pinging FF01.abc.com [127.0.0.1] with 32 bytes of data:
Reply from 127.0.0.1: bytes=32 time=-320722ms TTL=128
Reply from 127.0.0.1: bytes=32 time=-320722ms TTL=128
Reply from 127.0.0.1: bytes=32 time=-320722ms TTL=128
Reply from 127.0.0.1: bytes=32 time=-320722ms TTL=128
Ping statistics for 127.0.0.1:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = -320722ms, Maximum = -320722ms, Average = 1073421102ms
Also i cannot ping clients on other subnet by hostname.
I dont know since when it is going on, i am just handed over the server to fix it. but its been a long time.
Yes clients can access file shares and vice versa, RDP is not working from server to client.
Just to remind you, it is hosted on HYPER-V..........as described above. So it is virtual machine. Services running on it are MOM, ForeFront, SQL.
Which port i should monitor on WireShark?? DNS related traffic or something else??
Tuesday, April 27, 2010 9:51 AM
Hi ,
negative values represents errors, and lookat the average its wierd.
As a first troubleshooting , i would first upgrade the driver or replace it and check.
Tuesday, April 27, 2010 10:23 AM
Hi ,
negative values represents errors, and lookat the average its wierd.
As a first troubleshooting , i would first upgrade the driver or replace it and check.
What in case of HYPER-V OS.......it is virtual machine. should i do something outside in Virtual interface or just uninstal/reinstall driver inside.
Wednesday, April 28, 2010 8:40 AM
Hi
Could you post the route table of the guest os?
The virtual networks setting of this issuer guest os is same as the other guest os?
In the guest os,do any other forms of network access work? (file sharings , web browering etc.....)
Wednesday, April 28, 2010 9:03 AM
Hi
Could you post the route table of the guest os?
The virtual networks setting of this issuer guest os is same as the other guest os?
In the guest os,do any other forms of network access work? (file sharings , web browering etc.....)
Yes network setting is same as other guest OS. Yes it can access file shares from same subnet. But not other subnets as compared to other servers which can access other subnets' shares.
Here is the route table of the guest os
IPv4 Route Table
===========================================================================
Interface List
0x1 ........................... MS TCP Loopback interface
0x10003 ...00 15 5d 00 7a 04 ...... Microsoft Virtual Machine Bus Network Adapte
r #2
===========================================================================
===========================================================================
Active Routes:
Network Destination Netmask Gateway Interface Metric
0.0.0.0 0.0.0.0 10.72.0.254 10.72.0.79 10
10.72.0.0 255.255.255.0 10.72.0.79 10.72.0.79 10
10.72.0.79 255.255.255.255 127.0.0.1 127.0.0.1 10
10.255.255.255 255.255.255.255 10.72.0.79 10.72.0.79 10
127.0.0.0 255.0.0.0 127.0.0.1 127.0.0.1 1
224.0.0.0 240.0.0.0 10.72.0.79 10.72.0.79 10
255.255.255.255 255.255.255.255 10.72.0.79 10.72.0.79 1
Default Gateway: 10.72.0.254
===========================================================================
Persistent Routes:
None
and IPconfig/all
Z:\ipconfig /all
Windows IP Configuration
Host Name . . . . . . . . . . . . : FF01
Primary Dns Suffix . . . . . . . : abc.com
Node Type . . . . . . . . . . . . : Unknown
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . : abc.com
Ethernet adapter Local Area Connection 2:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft Virtual Machine Bus Network Ada
pter #2
Physical Address. . . . . . . . . : 00-15-5D-00-7A-04
DHCP Enabled. . . . . . . . . . . : No
IP Address. . . . . . . . . . . . : 10.72.0.79
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 10.72.0.254
DNS Servers . . . . . . . . . . . : 10.72.0.71
10.72.0.81
Z:\
Friday, April 30, 2010 6:08 AM
Looks the network setting is correct..........confused.........
Could you post a trace result here? From the guest os to the client
have you check the 10.72.0.254 for conform there not deny 10.72.0.79 throght ?
Also please follow the Sainath IRP_MJ_CREATEMVP's suggestion make use of /usepmtimer switch in boot.ini
Thanks
Friday, April 30, 2010 8:12 AM
Looks the network setting is correct..........confused.........
Could you post a trace result here? From the guest os to the client
have you check the 10.72.0.254 for conform there not deny 10.72.0.79 throght ?
Also please follow the Sainath IRP_MJ_CREATEMVP's suggestion make use of /usepmtimer switch in boot.ini
Thanks
Here it is.......yeah i will try his instructions definitely as soon as i will get access to Hyper-V machine.............in the mean time, here are the tracerts
Tracing route to 10.80.4.40 over a maximum of 30 hops
1 <1 ms <1 ms <1 ms 10.72.0.254
2 <1 ms <1 ms <1 ms 10.80.4.40
Trace complete.
Thursday, May 6, 2010 1:54 AM
After reading your post, I understand that you can ping same subnet hosts but other subnet.
We noticed that the delay quite long and negative response when you ping local subnet host.
It seems that this is an unexpected high latency, this issue frequently happens on hyper-v guest machine.
Please following Sainath’s suggestion to updates the BIOS on the computer. Or, modify the Boot.ini file to use the /usepmtimer switch.
In addiction here is an article for you reference
A Windows Server 2003-based server may experience time-stamp counter drift if the server uses dual-core AMD Opteron processors or multiprocessor AMD Opteron processors
http://support.microsoft.com/kb/938448
If there is any update on this issue, please feel free to let us know.
We are looking forward to your reply.
Thanks
Tiger Li