0

DHCP moving between VLAN

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

AL
3 ●1 ●11 ●9

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)

image description

edit retag flag offensive close merge delete

1 Answer

Sort by » oldest newest most voted

0

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

flag of Netherlands

18344 ●9 ●301 ●255 https://SYN-b.it

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.

edit flag offensive delete link

Your Answer

Please start posting anonymously - your entry will be published after you log in or create a new account.

Question Tools

1 follower

Stats

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

Seen: 268 times

Last updated: Feb 13 '23

Copyright Wireshark Foundation, 2017-2023 Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.

Powered by Askbot version 0.10.2