ESXi

I have 2x VM's, both located on the same ESXi6 server.

The vswitch is setup correctly and both VM's are on that same switch.

The network is a 1GB interfrace, and both VM's have 1GB interfaces.

However, I can only achieve 1MB/s between the 2 VMs.

Looking for ways to diagnose and fix this issue.

Suggestions, questions, clarifications, please let me know.

SCP between VMs: 0% 1865MB 963.7KB/s 219:48:49

VM1# ethtool eth0

Settings for eth0:

        Supported ports: [ TP ]

        Supported link modes:   1000baseT/Full

                                10000baseT/Full

        Supported pause frame use: No

        Supports auto-negotiation: No

        Advertised link modes:  Not reported

        Advertised pause frame use: No

        Advertised auto-negotiation: No

        Speed: 10000Mb/s

        Duplex: Full

        Port: Twisted Pair

        PHYAD: 0

        Transceiver: internal

        Auto-negotiation: off

        MDI-X: Unknown

        Supports Wake-on: uag

        Wake-on: d

        Link detected: yes

VM2# ethtool eth0

Settings for eth0:

        Supported ports: [ TP ]

        Supported link modes:   1000baseT/Full

                                10000baseT/Full

        Supported pause frame use: No

        Supports auto-negotiation: No

        Advertised link modes:  Not reported

        Advertised pause frame use: No

        Advertised auto-negotiation: No

        Speed: 10000Mb/s

        Duplex: Full

        Port: Twisted Pair

        PHYAD: 0

        Transceiver: internal

        Auto-negotiation: off

        MDI-X: Unknown

        Supports Wake-on: uag

        Wake-on: d

        Link detected: yes

Hi,

Do you have more machines on those hosts which uses  the same interfaces? are you copying over files or similar?

Yes, I have several other VM's similarly configured, and they can transfer files without issues.

Not sure what about these 2 VM's that is causing the problem.

Aditionally, when I transfer the file from VM1 -> physical host and then from physical host -> VM2, those transfers run at the expected/normal speeds for Gigabit ethernet.

It's only when I go directly between the 2 VMs that the issue presents itself.

Try to create new vSwitch without physical NIC, put both VMs into and try to check network speed between them.

We ended up resolving this issue by changing some settings on the vswitch.

Can you share the setting which helped to resolve your issue