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DHCPD issue with Firepower 7.0.1-7.1.0

babiojd01
Beginner
Beginner

So i have been deploying cisco FDM managed firewalls. I noticed an interesting bug with DHCP and 7.x code. If install a config via a backup, configure via API and upload a config, or deploy a template to a 7.x code using CDO to the  firewall it botches DHCP. Clients will run through the entire scope and request every IP address. Its a constant DHCP Decline via wireshark. Has any else seen this? I can duplicate it and have. If i stick with 6.6 code it seems to work.

3 REPLIES 3

balaji.bandi
VIP Guru VIP Guru
VIP Guru

personally, i will not use FW as DHCP Server, but sometimes requirements may change.

 

Since this is new code, there may be bugs around worth looking at below release notes :

 

https://www.cisco.com/c/en/us/td/docs/security/firepower/70/relnotes/firepower-release-notes-700/bugs.html

 

if this is a major issue worth contacting Cisco TAC.

BB

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It ended up being something with NAT. Without the destination interface specified in the nat it cause a major DHCP malfunction.

It gets better, if i put a static ip from the same subnet it tells me another device has that IP. Something is really messed up. I have one device plugged into the firewall port.

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