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High TCP packet retransmission between Windows VM ?

Posted on 2015-01-21
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Last Modified: 2015-01-28
People,

Can anyone please assist me with some explanation and suggestion of how to fix this issue or even guide me where to troubleshoot further for the High TCP packet retransmission between Windows VM ?

This is detected by the network operations team and it is my current problem that I'm facing with the Terminal Server users in remote sites connecting to the data center.

Here's the envrionment:

VMware ESXi 5.1 update 1 running on HP Blade BL 465c G7/8

User connecting from the remote desktop in various geographical sites, to the Load Balanced virtual IP (managed by Riverbed SteelApp appliance)

Windows Server 2008 R2 SP1 Terminal Servers running Oracle forms application which talks to another VM running Windows Server 2008 R2 SQL Server 2008 R2

The TCP retransmission happens between the two types of VMs above in the different and the same ESXi hosts so it is always happening no matter where the Vm is.

There is no CPU ready or vRAM memory contention or vCPU over provisioned in all ESXi host (all under 1:3 ratios pCPU to vCPU ratio).

Any idea would be greatly appreciated.
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LVL 118
ID: 40563789
Are you using the VMXNET3 and VMware Tools must be installed to support this virtual network interface in the VM?
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Author Comment

by:Senior IT System Engineer
ID: 40563871
Yes I'm using VMXnet 3 for all VMs 2008R2.
All of the VM already installed with latest VMware tools
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LVL 61

Expert Comment

by:gheist
ID: 40564879
ESXi 5.1 U1 aka 5.5.0 had exact problems with packet loss on same host. Just upgrade and you will be fine.
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LVL 7

Author Comment

by:Senior IT System Engineer
ID: 40568952
Where is exactly saying that ESXi 5.1 Update 1 is having a problem with this packet loss & retransmission ?


can you please show me the KB article to convinve my manager to perform the upgrade ?
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LVL 61

Expert Comment

by:gheist
ID: 40569033
He can choose not to upgrade or try to call vmware support with outdated version. Their answer will always be upgrade to latest update and check again.
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Author Comment

by:Senior IT System Engineer
ID: 40569062
Ok does this problem listed somewhere in the KB article or solved in ESXi 5.1 Update 3 release note?
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gheist earned 500 total points
ID: 40569066
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LVL 61

Expert Comment

by:gheist
ID: 40569073
Basically problem exhibits as loss of TSO-fragmented packets, once receiving ACK host stops re-sending them, though it surely re-transmits hopelessly to avoid fakely reported loss...
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LVL 7

Author Comment

by:Senior IT System Engineer
ID: 40569119
Ok,
In this case can I just upgrade the ESXi hosts directly (inline) from 5.1u1 to Update 3 ?
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Expert Comment

by:gheist
ID: 40569207
Exactly!
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