No internet - DHCP

[robinh007]

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

[funkylicious]

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 ?

[dingjerry_FTNT]

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.