Configure DHCP relay (dhcp-helper)
mbox can function as a DHCP relay to forward host/client DHCP requests to an external DHCP server. Please refer to this link for more details on mbox DHCP features.
When configuring dhcp-relay interfaces, following conditions apply:
mbox must be reachable to upstream DHCP server
can assign dhcp-relay to specific interfaces only
when dhcp-relay is configured on the interface, we can not enable dhcp-server (eg. configure mbox to assign IP addresses) on the same interface
NOTE: we can not have both dhcp-server and dhcp-helper running on the same mbox, because both of these services are using the same opening ports (UDP/67/68). mbox can either act as a dhcp-server or dhcp-helper (while dhcp client is supported at all circumstances as this is just a interface specific utility).
CONFIGURATION STEPS
configure a L2TPv3 tunnel
configure VLAN interfaces on LAN ethernet port, assign each VLAN to a bridge
configure VLAN interfaces on L2TPv3 tunnel, assign each VLAN to the same bridge
CONFIGURATION EXAMPLES
!interface eth1enableip address 10.89.4.245/24ip dhcp-helper 202.10.10.99!interface vlan 1 200enabledescription "voice vlan"ip address 172.16.1..245/24ip dhcp-helper 202.10.10.99!Useful troubleshooting commands:
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tcpdump interface xx port 67 (use this to check dhcp request and reply. xx is the interface enabled with dhcp-relay)