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Mac Address Filter

johnie_PM

I'd like to know about MAC Address Filtering in Sopho UTM 9 firewall. I have 5 Vlans,

  • vlan2-management (10.1.0.0/24)
  • vlan3-Server (10.2.0.0/24)
  • vlan4-Office-Group (10.3.0.0/24)
  • vlan5-Branch-Group (10.4.0.0/24)

I also have DHCP Server on UTM for vlan4 and vlan5. I don't want any client to receive ip address that are obtained from DHCP server for vlan4 and vlan5. I want to get specific MAC address to get dhcp from UTM. 

My target : I don't want any client to get IP Addresses from dhcp server (for vlan4 and vlan5) except white list MAC Address.

Best Rg,

Johnie Paul 



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  • Look at the advanced settings of a dhcp server.

    I don't think there should be any other dhcp server for that vlan.

    A bunch of entries like this show up in the dhcp server log

    2021:06:02-01:23:48 utm dhcpd: DHCPDISCOVER from 11:22:33:44:55:66 via eth0: unknown client
    2021:06:02-01:23:52 utm dhcpd: DHCPDISCOVER from 11:22:33:44:55:66 via eth0: unknown client
    2021:06:02-01:23:56 utm dhcpd: DHCPDISCOVER from 11:22:33:44:55:66 via eth0: unknown client
    2021:06:02-01:24:05 utm dhcpd: DHCPDISCOVER from 11:22:33:44:55:66 via eth0: unknown client

    The problem however is one can assign their own static ip. So maybe a packet filter white list.

    Maybe this will help- support.sophos.com/.../KB-000034810

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