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Check the manual on capture setup. In a switched environment, you can only see frames which the switch delivers to your laptop, which is limited to frames whose destination MAC address is the one of your laptop, or a multicast or broadcast one, or a unicast one of a device which has not responded yet. While DHCPDISCOVERY messages are sent to broadcast address, DHCPREQUEST are not, and lease renewal is done using DHCPREQUEST (the device selectively contacts only the DHCP server from which it got the lease).
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