Validate MTU requirements across every layer of your NSX/VCF overlay stack. Enter your physical and VM MTU values to identify mismatches that cause silent packet drops.
Your data stays on your device. All calculations run entirely in your browser — no data is sent to any VirtualBytes server.
Disclaimer: MTU calculations are based on standard encapsulation overhead values. Always verify with your specific hardware vendor documentation and test end-to-end with large ICMP/ping tests (ping with DF bit set) before deploying.
Overlay encapsulation
GENEVE
NSX-T / NSX 4.x — default encapsulation
+58 bytes overhead
VXLAN
Legacy NSX-V / third-party overlays
+50 bytes overhead
No overlay
Physical-only / standard VLAN switching
+0 bytes overhead
Physical underlay
Physical switch MTU ?
Physical NIC MTU on ESXi host ?
VMkernel & VM layer
vmk TEP MTU ?
VM / guest NIC MTU ?
Ethernet frame
Ethernet header overhead ?
Configure and calculate
Adjust your MTU values on the left to see the full path analysis.