We've got a corporate VLAN 1 on a Cisco 3650 switch with a DHCP pool configured on cisco ISR4321. Both devices interconnected. On the switches, I've got Meraki AP with corporate SSID that utilize the vlan1 dhcp.
Comcast ------ ISR ------ 3650 ------ Meraki AP
Everything worked perfectly until there was a bad storm and killed the connection overnight. Things came back up but now, some corporate laptops get the dhcp from the vlan 1 (10.40.10.0) which is good and some get dhcp directly from the Comcast modem behind the ISR. The weird part is, the users that get the Comcast IP (10.1.10.0) it shows they are connected to the corporate SSID, how is that possible? And how do I get rid of that? I tried rebooting everything, clearing DHCP, etc... it's almost as if it's cached on the laptops end. Laptops were rebooted as well.
I will get more time to troubleshoot tonight, just trying to get ideas. I could turn off dhcp on the Comcast modem but the ISR gets dhcp from 10.1.10.0 on the outside interface, any ideas?
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