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DHCP moving between VLAN

asked 2023-02-13 15:32:31 +0000

AL gravatar image

updated 2023-02-13 15:33:32 +0000

Client connected to Cisco Meraki Access Points

Client connected to VLAN 5 and gets IP from that VLAN

When client moves to another floor and that is on VLAn 4 the client does not get VLAN IP from VLAN 4 but retains it IP from VLAN 5

I have done a wireshark trace and this is what I see from the client (no Dicovery or Offer but directly to Request and Ack)

I would assume when moving to another VLAN, the Discovery process would kick in

Trace of DHCP request (filtered by client MAC address)

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answered 2023-02-13 15:55:47 +0000

SYN-bit gravatar image

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.

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Asked: 2023-02-13 15:32:31 +0000

Seen: 360 times

Last updated: Feb 13 '23