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Revision 2
SYN-bit's avatar
18.5k
SYN-bit
updated 2023-02-13 21:25:51 +0000

The client is not aware of a VLAN change, so it will just do a Request. If there is a helper address on the VLAN, then the router/l3-switch will indicate to the DHCP server that the request was from VLAN 4, triggering the DHCP server to respond with a NAK to make the client send a new DISCOVER.

Revision 1
SYN-bit's avatar
18.5k
SYN-bit
answered 2023-02-13 15:55:47 +0000

The client is not aware of a VLAN change, so it will just do a Request. If there is a helper address on the VLAN, then the router/l3-switch it will indicate to the DHCP server that the request was from VLAN 4, triggering the DHCP server to respond with a NAK to make the client send a new DISCOVER.