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DHCP relay agents do not function in NSX (2147322)

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Symptoms

When configuring DHCP relay agents on distributed logical router in NSX for vSphere, you experience  these symptoms:
  • Virtual machines configured on Logical Switches where a DHCP relay agent is configured do not obtain IP addresses.
  • The DHCP server does not receive any initial DHCP discovery packets from the relay agent.
  • DHCP discovery packets are dropped in transit due to TTL expiry.

Purpose

Upgrading to NSX for vSphere 6.2.5 resolves the issue.

Cause

Distributed logical router sets an IP TTL (time to live) of 10 for forwarded DHCP requests from relay agents. If your DHCP server is 10 or more hops away, the TTL will expire in transit and the DHCP discovery packets gets dropped.

Resolution

This issue is resolved in VMware NSX for vSphere 6.2.5, available at VMware Downloads.

To work around this issue if you do not want to upgrade, configure a DHCP server closer (fewer than 10 hops) to the virtual machines requesting addresses and point the DHCP relay to this server. An Edge Services Gateway (ESG) can be configured for this purpose if required.

Additional Information

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See Also

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zh_cn,2149232

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