DHCP Offer with a yiaddr field value of 0.0.0.0 are not relayed by DHCP relay on T0 or T1

Products

• VMware NSX Networking

Issue/Introduction

Symptoms:
DHCP Offer with a yiaddr field value of 0.0.0.0 are not relayed by DHCP relay on T0 or T1

Environment

VMware NSX-T Data Center 2.5.x
VMware NSX-T Data Center 2.x
VMware NSX-T Data Center
VMware NSX-T

Cause

When a DHCP offer has a yiaddr field value of 0.0.0.0, the packet is recognized as invalid and dropped by the DHCP relay on the T0 or T1.
This can be the case with PXE DHCP servers which only provide PXE information and no IP addresses.

Resolution

Currently there is no resolution.

Workaround:
The possible workaround are:
- Deploy a DHCP proxy directly to the segment instead of using DHCP Relay.
- Use DHCP with options (option 60 for PXE for example).