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robinh007
robinh007
Explorer III
April 26, 2025
Question

No internet - DHCP

  • April 26, 2025
  • 2 replies
  • 663 views

Hi,

 

This query is related to DHCP.

 

I configured the DHCP lease time to 7 days, and everything is functioning correctly overall. However, a few users encountered an issue where they received an IP from DHCP but were unable to access the internet. Releasing and renewing the IP resolved the problem.

 

Upon investigation, I discovered a known issue (Bug ID: 1069208) in v7.4.7 related to DHCP.

 

Bug ID: 1069208 indicates that if a DHCP offer contains padding while using a DHCP relay, the relay removes the padding before forwarding the packet.

 

Please confirm whether this bug is related to the issue we are facing.

 

#fortigate

2 replies

funkylicious
SuperUser
funkylicious
SuperUser
April 26, 2025

hi,

it maybe the case that you hit that bug, if your FGT acts as a relay and not the server itself that assigns ip to users.

how is the issue manifesting? do they get a valid ip/dns/gateway ? does ping towards 8.8.8.8 work or is it more a dns issue where they cannot resolve hostname into an ip ?

have you done any tshoot while this is happening or can you reproduce the issue ?

 

"jack of all trades, master of none"
dingjerry_FTNT
Staff
dingjerry_FTNT
Staff
April 26, 2025

Hi @robinh007 ,

 

You did not provide your FGT config and your DHCP config on FGT, we can't confirm it for you.

 

If you are not using DHCP relay + offering padding, no, you are not hitting this bug.

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