Set DHCP request to UNICAST for Virgin Media



  • Hi
    I am trying to change my router into modem mode but without any success. No matter what I do pfsense will not get an ip address. It works fine when the modem is in router mode but nothing in modem mode. If I connect my pc to it instead it does get an address. I am led to believe that this is caused by using broadcast mode rather than unicast.

    https://community.virginmedia.com/t5/QuickStart-set-up-and/Super-Hub-2-in-Modem-Mode-Possible-failure/td-p/2860582

    Is there a way to change the dhcp behaviour on an interface to unicast using the advanced settings?

    this is what is recorded in the log
    –--------------------------------------------
    dhclient: PREINIT
    DHCPREQUEST on em0 to 255.255.255.255 port 67
    DHCPREQUEST on em0 to 255.255.255.255 port 67
    DHCPREQUEST on em0 to 255.255.255.255 port 67
    DHCPDISCOVER on em0 to 255.255.255.255 port 67 interval 2
    DHCPDISCOVER on em0 to 255.255.255.255 port 67 interval 5
    DHCPDISCOVER on em0 to 255.255.255.255 port 67 interval 13
    DHCPDISCOVER on em0 to 255.255.255.255 port 67 interval 20
    DHCPDISCOVER on em0 to 255.255.255.255 port 67 interval 14
    DHCPDISCOVER on em0 to 255.255.255.255 port 67 interval 7
    No DHCPOFFERS received.
    Trying recorded lease 192.168.0.3
    bound: renewal in 41037 seconds.

    thanks
    Stephen



  • You can't unicast the initial DHCP request, that's not how DHCP works. Your PC certainly isn't doing that. Guessing maybe you need to power cycle the modem after swapping devices so it allows something else to connect.


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