DHCP Failure due to BOOTP Broadcast

Forum|Forum|3 years ago
October 19, 2022
6 replies
4877 views

Is there any way to set the Fortigate DHCP client on wan1 to use the Unicast BOOTP flag? I'm using an 80F (7.x firmware) on Optimum Fiber and due to their network configuration, they're ignoring DHCPDISCOVER's with the Broadcast flag set. This is identical to Re: Fortigates incompatibility with Telenet DOCSIS... - Fortinet Community

FortiGate

Jean-Philippe_P

Staff & Editor

Hello jdconti,

Thanks for posting on the Fortinet Community Forum!

I found documents that can help you :

https://community.fortinet.com/t5/FortiGate/Technical-Tip-Diagnosing-DHCP-on-a-FortiGate/ta-p/192960

or

https://community.fortinet.com/t5/FortiGate/Technical-Tip-DHCP-address-leases-on-a-FortiGate-unit/ta-p/195446

Can you tell me if it solved your problem or if you need more assistance please?

Kindest regards,

Jean-Philippe - Fortinet Community Team

jdcontiAuthor

Visitor III

Hey Jean-Philippe,

That was useful but only confirms my suspicion regarding the broadcast BOOTP flag. In many ISP deployments that utilize DHCP relaying they often discard DHCPDISCOVER packets with the broadcast flag set. Is there any to toggle the BOOTP flag on the wan1 DHCP client to unicast? If not, there should be... I'm also wondering how the issue was fixed in 6.x firmware for the previously mentioned Telenet issue, could you provide details?

Thanks!