Hot!FortiOS 6.0.3 Issues with Fortigate DHCP server and Cisco WAPs

Author
Jim Manley
New Member
  • Total Posts : 1
  • Scores: 0
  • Reward points: 0
  • Joined: 2018/11/29 14:10:40
  • Location: Fort Worth, Texas
  • Status: offline
2018/12/11 09:23:41 (permalink)
0

FortiOS 6.0.3 Issues with Fortigate DHCP server and Cisco WAPs

I updated a Fortigate 81E to FortiOS 6.0.3.  After doing so, the DHCP services to wireless devices connecting via Cisco WAPs broke.  After a bit of wiresharking it appears that the way FortiOS processes the DHCP Offer packets has changed.  In particular, the server seems to ignore the DCHP Discover's broadcast bit and sends out the DHCP Offer as a broadcast at the IP and MAC layers.  This is different than what FortiOS 5.4.4 does.  The difference is enough to impact my Cisco gear.
 
I've submitted a ticket along with explanation and wireshack captures to Tech Support but they've been strangely quiet about it.
 
Has anyone else noticed this behavior?
 
Thanks.
 
Jim
#1

1 Reply Related Threads

    Toshi Esumi
    Expert Member
    • Total Posts : 1293
    • Scores: 93
    • Reward points: 0
    • Joined: 2014/11/06 09:56:42
    • Status: offline
    Re: FortiOS 6.0.3 Issues with Fortigate DHCP server and Cisco WAPs 2018/12/12 17:29:02 (permalink)
    0
    DHCP discovery is regularly ignored if you reboot the server side because after the reboot it doesn't know previous assignment for those clients. The client side needs to request a new IP when the discovery process times out.
    https://en.wikipedia.org/wiki/Dynamic_Host_Configuration_Protocol#DHCP_discovery
    So that part is normal but something else must have been changed to break it.
    #2
    Jump to:
    © 2019 APG vNext Commercial Version 5.5