My VM RHEL4 cannot get status network link down

[chonwa]

Hi All,

RHEL4 on VM cannot get status network link down.

when I unplug network cable.

- ESX found interface down

- but VM RHEL4 not detect that !, It show still up (mii-tool)

Please help share you idea for my case.

ESXi 5.1.0, RHEL4

Thank you,

[ssbkang]

Hi,

So are you using vSwitch0 for virtual machine traffic and vSwitch2 for ESXi Management traffic?

Steven.

[chonwa]

Hi skan070,

     I using

       vmnic1-- vSwitch0     for Management

and  vmnic0-- vSwitch2     for vm

Thank you,

chonwa

[ssbkang]

Hi Chonwa, What I think is, as VMware vNICs aren't actually physical interfaces, as long as the vNICs are connected to virtual machine, mii-tool might think they are still up (VMware layer). Sorry for not giving you a clear answer, haven't used mii-tool before. Regards, Steven.

[chonwa]

Hi skan070,

Thanks for your reply

It's mean  network interface in VM never down, if I just unplug cable ?

nic on VM will down in ONLY case I disconnect vmnic (VM>edit setting) right?

     Actually, I want to test bonding interface (eth0,eth1) on O/S level (not teaming on ESX)

when I unplug physical interface for eth0, but eth0 not down !!

Thank you,

Chonwa

[ssbkang]

Hi Chonwa,

It's just my guess, not quite sure how mii-tool works!

Do you have another virtual machine with different OS? It will pay off to check if it's mii-tool that cannot detect the ethernet down!?

Regards,

Steven.

[chonwa]

OK Steven,

     Another one VM is Window server 2008 R2

In the same problem I unplug network cable but on VM it still UP (up but can't ping to GW)

Thank you,

Chonwa

[ssbkang]

Hi Chonwa,

Hmm? So after you unplug a physical cable, virtual machine still thinks the ethernet is still up?

I just did a test, not with a physical cable but logically, the virtual machine lost the network connectivity right away.

I will take a look into it more.

-S

[chonwa]

Steven,

     I ever test with logic (vm>edit setting), status on VM is down normally.

Why no anyone found this problem?

Thanks,

Chonwa

[rhishimagdum]

Hi,

I'm also facing the same problem. By any chance, did you find the answer ?

[bharathl]

I think after you disconnect the Physical NIC as there are no NICs connected to virtual switch its behaving like a private isolated network.The switch can still pass the traffic between the VMs connected to it if they are on the same vlan.

[rhishimagdum]

That means there is no way VM can detect physical link status ?