My VM RHEL4 cannot get status network link down

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,