Thank for your help !
the traffic is output.
the management and virtual machines are on the same vmnic0 .
i tried esxtop, but i got this output :
~ # esxtop
no termcap entry for a `xterm-256color' terminal"(PDH-CSV 4.0) (UTC)(0)","\\localhost.\Memory\Memory Overcommit (1 Minute Avg)","\\localhost.\Memory\Memory Overcommit (5 Minute Avg)","\\localhost.\Memory\Memory Overcommit (15 Minute Avg)","\\localhost.\Physical Cpu Load\Cpu Load (1 Minute Avg)","\\localhost.\Physical Cpu Load\Cpu Load (5 Minute Avg)","\\localhost.\Physical Cpu Load\Cpu Load (15 Minute Avg)","\\localhost.\Physical Cpu(0)\% Processor Time","\\localhost.\Physical Cpu(1)\% Processor Time","\\localhost.\Physical Cpu(2)\% Processor Time","\\localhost.\Physical Cpu(3)\% Processor Time","\\localhost.\Physical Cpu(4)\% Processor Time","\\localhost.\Physical Cpu(5)\% Processor Time","\\localhost.\Physical Cpu(6)\% Processor Time","\\localhost.\Physical Cpu(7)\% Processor Time","\\localhost.\Physical Cpu(_Total)\% Processor Time","\\localhost.\Physical Cpu(0)\% Util Time","\\localhost.\Physical Cpu(1)\% Util Time","\\localhost.\Physical Cpu(2)\% Util Time","\\localhost.\Physical Cpu(3)\% Util Time","\\localhost.\Physical Cpu(4)\% Util Time","\\localhost.\Physical Cpu(5)\% Util Time","\\localhost.\Physical Cpu(6)\% Util Time","\\localhost.\Physical Cpu(7)\% Util Time","\\localhost.\Physical Cpu(_Total)\% Util Time","\\localhost.\Memory\Machine MBytes","\\localhost.\Memory\Kernel MBytes","\\localhost.\Memory\NonKernel MBytes","\\localhost.\Memory\Free MBytes","\\localhost.\Memory\Kernel Managed MBytes","\\localhost.\Memory\Kernel MinFree MBytes","\\localhost.\Memory\Kernel Reserved MBytes","\\localhost.\Memory\Kernel Unreserved MBytes","\\localhost.\Memory\Kernel State","\\localhost.\Numa Node(0)\Total MBytes","\\localhost.\Numa Node(0)\Free MBytes","\\localhost.\Numa Node(1)\Total MBytes","\\localhost.\Numa Node(1)\Free MBytes","\\localhost.\Memory\PShare Shared MBytes","\\localhost.\Memory\PShare Common MBytes","\\localhost.\Memory\PShare Savings MBytes","\\localhost.\Memory\Swap Used MBytes","\\localhost.\Memory\Swap Target MBytes","\\localhost.\Memory\Swap MBytes Read/sec","\\localhost.\Memory\Swap MBytes Write/sec","\\localhost.\Memory\Total Compressed MBytes","\\localhost.\Memory\Total Saved By Compression MBytes","\\localhost.\Memory\Memctl Current MBytes","\\localhost.\Memory\Memctl Target MBytes","\\localhost.\Memory\Memctl Max MBytes","\\localhost.\Power\Power Usage Now Watts","\\localhost.\Power\Power Usage Cap Watts","\\localhost.\Group Cpu(1:idle)\Members","\\localhost.\Group Cpu(1:idle)\% Used","\\localhost.\Group Cpu(1:idle)\% Run","\\localhost.\Group Cpu(1:idle)\% System","\\localhost.\Group Cpu(1:idle)\% Wait","\\localhost.\Group Cpu(1:idle)\% Ready","\\localhost.\Group Cpu(1:idle)\% Idle","\\localhost.\Group Cpu(1:idle)\% Overlap","\\localhost.\Group Cpu(1:idle)\% CoStop","\\localhost.\Group Cpu(1:idle)\% Max Limited","\\localhost.\Group Cpu(1:idle)\% Swap Wait","\\localhost.\Vcpu(1:idle:4097:idle1)\% Used","\\localhost.\Vcpu(1:idle:4097:idle1)\% Run","\\localhost.\Vcpu(1:idle:4097:idle1)\% System","\\localhost.\Vcpu(1:idle:4097:idle1)\% Wait","\\localhost.\Vcpu(1:idle:4097:idle1)\% Ready","\\localhost.\Vcpu(1:idle:4097:idle1)\% Idle","\\localhost.\Vcpu(1:idle:4097:idle1)\% Overlap","\\localhost.\Vcpu(1:idle:4097:idle1)\% CoStop","\\localhost.\Vcpu(1:idle:4097:idle1)\% Max Limited","\\localhost.\Vcpu(1:idle:4097:idle1)\% Swap Wait","\\localhost.\Vcpu(1:idle:4098:idle2)\% Used","\\localhost.\Vcpu(1:idle:4098:idle2)\% Run","\\localhost.\Vcpu(1:idle:4098:idle2)\% System","\\localhost.\Vcpu(1:idle:4098:idle2)\% Wait","\\localhost.\Vcpu(1:idle:4098:idle2)\% Ready","\\localhost.\Vcpu(1:idle:4098:idle2)\% Idle","\\localhost.\Vcpu(1:idle:4098:idle2)\% Overlap","\\localhost.\Vcpu(1:idle:4098:idle2)\% CoStop","\\localhost.\Vcpu(1:idle:4098:idle2)\% Max Limited","\\localhost.\Vcpu(1:idle:4098:idle2)\% Swap Wait","\\localhost.\Vcpu(1:idle:4099:idle3)\% Used","\\localhost.\Vcpu(1:idle:4099:idle3)\% Run","\\localhost.\Vcpu(1:idle:4099:idle3)\% System","\\localhost.\Vcpu(1:idle:4099:idle3)\% Wait","\\localhost.\Vcpu(1:idle:4099:idle3)\% Ready","\\localhost.\Vcpu(1:idle:4099:idle3)\% Idle","\\localhost.\Vcpu(1:idle:4099:idle3)\% Overlap","\\localhost.\Vcpu(1:idle:4099:idle3)\% CoStop","\\localhost.\Vcpu(1:idle:4099:idle3)\% Max Limited","\\localhost.\Vcpu(1:idle:4099:idle3)\% Swap Wait","\\localhost.\Vcpu(1:idle:4100:idle4)\% Used","\\localhost.\Vcpu(1:idle:4100:idle4)\% Run","\\localhost.\Vcpu(1:idle:4100:idle4)\% System","\\localhost.\Vcpu(1:idle:4100:idle4)\% Wait","\\localhost.\Vcpu(1:idle:4100:idle4)\% Ready","\\localhost.\Vcpu(1:idle:4100:idle4)\% Idle","\\localhost.\Vcpu(1:idle:4100:idle4)\% Overlap","\\localhost.\Vcpu(1:idle:4100:idle4)\% CoStop","\\localhost.\Vcpu(1:idle:4100:idle4)\% Max Limited","\\localhost.\Vcpu(1:idle:4100:idle4)\% Swap Wait","\\localhost.\Vcpu(1:idle:4101:idle5)\% Used","\\localhost.\Vcpu( ..................(long output)