Issues with DHCP Relay following upgrade to 7.4.3 on 40F and 7.4.2 on Fortiswitch 124F

Forum|Forum|2 years ago
February 26, 2024
14 replies
14132 views

Hello

I have recently upgraded my Fortigate 40F unit to 7.4.3 and associated Fortiswitch 124F connected with Fortilink to version 7.4.2

Ever since i have done this my DHCP relay no longer works. DHCP from the Fortigate interfaces work fine but when i enable DHCP relay there is no DHCP response and i cannot see any DHCP traffic being forwarded to my DHCP server. I can ping my server with no issue.

Any assistance would be helpful.

Show previous replies

Martin_HancockAuthor

New Member

I am testing with an access port. My switches are connected via Fortilink

jsauer

New Member

I'm having a similar issue with DHCP relay and 7.4.3 (was .2, upgraded and issue still there). I'll be downgrading to 7.2.7 tonight to test and can report back my results tomorrow when I'm in the office again.

Martin_HancockAuthor

New Member

Hi @jsauer

Do you have forti switches as well?

jsauer

New Member

No, Ubiquiti switches and access points. The VLANs all worked before I put the Fortigate in (was running a Sophos UTM) and with DHCP relay enabled on that device.

Martin_HancockAuthor

New Member

Hi there

i have an update

after speaking to my WAN provider it turns out there was an issue at their end to do with Circuit ID Insertion selected as “PPoE Relay". Once they changed this to something else the DHCP traffic could communicate with no issue.

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