FTD DHCP Server Issue

[i.leridant]

Hello everyone,

I am installing a FTD (5516-X)with FMC for a PoC to my customer. 

I have configured a dhcp server on my inside interface.

My 5516-X is linked with a switch in this interface, configured in access mode, vlan 2.

I disabled dhcp snooping for my test.

When I configure : interface vlan 2 => ip add dhcp the switch gets its IP and it is stable :

DHCPD: assigned IP address 10.0.0.109 to client 0063.6973.636f.2d66.3837.622e.32 30.3064.2e35.3763.312d.566c.32.

When I plug my laptop, I have this :

dhcpd_create_automatic_binding() adding NP rule for client 10.0.0.106
DHCPD: assigned IP address 10.0.0.106 to client 0134.e6d7.4cef.30.
DHCPD/RA: Delete binding 10.0.0.106 from radix tree.
DHCPD: returned 10.0.0.106 to address pool inside.
dhcpd_create_automatic_binding() adding NP rule for client 10.0.0.107
DHCPD: assigned IP address 10.0.0.107 to client 0134.e6d7.4cef.30.
DHCPD/RA: Delete binding 10.0.0.107 from radix tree.
DHCPD: returned 10.0.0.107 to address pool inside.
dhcpd_create_automatic_binding() adding NP rule for client 10.0.0.108
DHCPD: assigned IP address 10.0.0.108 to client 0134.e6d7.4cef.30.
DHCPD/RA: Delete binding 10.0.0.108 from radix tree.
DHCPD: returned 10.0.0.108 to address pool inside.

Does someone has any idea of what is going on ?

Thanks for your help !

[MaciejWlazlinski]

We are having exactly the same issue FTD - we had to gave up WIN DHCP cause FTD was starving our DHCP server by booking new IP address each time the client restarted VPN session (Please see the screen shot from test environment) generating that random long  "Unique ID" at WIN DHCP instead of simply providing the MAC address of the host

[MaciejWlazlinski]

additionally due to the fact that "Unique ID" is different every time we are having issues with our DNS cuase DNS scavenging is now in trouble due to the lack for possibility to getting rid of old host entries in time :/

[usmanlodhi1001]

Exactly I am Facing the Same Issue with 5516X is there any solution?