Thanks for your reply. Yes, It is (The MX is always going to use the subnet from the highest VLAN as the source subnet when it's sending the request to the DHCP server). Actually, I have two vlan (ID:163 , 100) in the Addressing & VLANs, and these have in the dhcp relay and shared across the VPN. But only is working DHCP relay en highest VLAN (163), in dhcp relay vlan (100) no work.
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