======LIMITATION ON USING DHCP RELAY OVER VPN======



**Symptoms:** 
  * Limitation on using DHCP Relay over VPN  
  * DHCP Relay not working over the VPN tunnel  
  * PC not getting an IP address over the VPN tunnel  
 

**Facts:**

  * 3CRTPX5-U-96  
  * 3CRX506-96  
  * X5  
  * X506  

**Causes:**


DHCP relay over VPN allows DHCP to operate between a DHCP client at a remote site and a DHCP server at a different site via a VPN tunnel. If you want to allow a DHCP server at one site to provide IP configuration to clients attached to a remote LAN via VPN, use DHCP relay over VPN. For example, a DHCP server might reside at the headquarters of a company. You can configure the devices in the remote branches to relay DHCP requests to the headquarters device, which in turn relays the requests to the DHCP server.
 
 
**Fixes:** You can only use DHCP relay over VPN when the VPN between the two devices is set up to use Internet Key Exchange (IKE).
 



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  * Product(s):  TippingPoint, X Family  
  * Sub Product(s): X505, X506, X5, X506  



--- //[[nce@itclatam.com|David Gonzalez]] 2021/04/16 17:52//