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duetgroup_tech
duetgroup_tech
New Member
May 19, 2020
Question

Fortigates incompatibility with Telenet DOCSIS 3.1 E-ROUTER

  • May 19, 2020
  • 1 reply
  • 13994 views

Hello all.

 

 

If you are using a Fortigate with the Belgian Cable ISP Telenet, you should know that there is a known incompatibility between Fortigates and the new Telenet DOCSIS 3.1 E-ROUTER. This is the kind of router that they install for all new clients. For now, it is possible to request Telenet to install a DOCSIS 3.0 modem and that solves the issue, but going forward this could become a big problem, especially if they require all their clients to switch to DOCSIS3.1.

 

The problem seems to be that Fortigates don't support Unicast DHCP. 

 

As far as I can tell the incompatibility is known to Telenet, but I don't know if Fortinet knows or not. I have opened a TAC case to find out.

 

    1 reply

    mjcrevier
    mjcrevier
    New Member
    May 19, 2020

    I saw similar issues with Netgear modems used by Comcast in the States. Wonder if they use the same hardware.

    emnoc
    emnoc
    New Member
    May 19, 2020

    Can you explain unicast DHCP? The whole purpose of DHCP is the client has no "address" so how is unicast used here? Outside of a DHCP-relay concept, DHCP is broadcasted 

     

    Ken Felix

    duetgroup_tech
    duetgroup_techAuthor
    New Member
    May 20, 2020

    From what I understand, "Unicast DHCP" is a misnomer.

    Unicast refers to the Broadcast flag set in the Bootp flags. The Fortigate sets it to "Broadcast", whereas regular Windows/MacOS clients set it to "Unicast".

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