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Cheeseman1969
Cheeseman1969
New Member
June 16, 2020
Question

DHCP not working when we lose our ISP

  • June 16, 2020
  • 1 reply
  • 6465 views

Just like the title says, we lose DHCP from the fortinet 501E when we lose our ISP. DHCP is setup on the router and nothing else is giving out those IP's on our network. Weird how this is going on. Our AP are ruckus and once it loses the DHCP IP, it can't get back online. If we connect in via wire and manual IP, it all works. 

Currently Windstream has an issue and this is how we found out about it. It happened last time we lost internet but though it was the AP's. But investigating this, we saw that no DHCP leases are going out. 

Thank

    1 reply

    ede_pfau
    SuperUser
    ede_pfau
    SuperUser
    June 17, 2020

    Are you sure the APs are not cloud-managed?

     

    FortiOS version? The DHCP server functionality is rock solid IMHO and losing internet access is far from influencing this. You could sniff your outbound traffic to see what's happening.

    Cheeseman1969
    Cheeseman1969Author
    New Member
    June 17, 2020

    Yes our AP's are cloud managed BUT if we wire in, our laptops/desktops does not get a DHCP lease either. Nothing does. It is like it just quits. We thought it was an issue with the AP, but now, need to fix this first. 

     

    ede_pfau
    SuperUser
    ede_pfau
    SuperUser
    June 18, 2020

    Then the DHCP funtionality is provided by the APs...

    Let's look at the traffic:

    open a console window and

     

    diag debug enable

    diag deb app dhcps -1

     

    and then connect a client. Repeat with internet off, and post it here.

     

    (to stop: diag deb app dhcps 0 and diag deb dis)

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