Stop dhcpdiscover/dhcpoffer to specific mac adress

[T53N]

Hello all,

I have a ASUS RT-AC87U router with Merlin firmware. I'm very happy with the firmware and hardware. The pas few weeks I noticed something in the logfiles. a specific mac adress keeps asking for a ip-adress. Is there something to do to stop this proces? I have no idea wich device is the cause of this, I don't think this is a device of mine.

Thanks in advance!

Jul 12 21:04:09 dnsmasq-dhcp[15147]: DHCPDISCOVER(br0) 56:fa:3e:92:e2:42
Jul 12 21:04:09 dnsmasq-dhcp[15147]: DHCPOFFER(br0) 192.168.1.145 56:fa:3e:92:e2:42
Jul 12 21:04:09 dnsmasq-dhcp[15147]: DHCPDISCOVER(br0) 56:fa:3e:92:e2:42
Jul 12 21:04:09 dnsmasq-dhcp[15147]: DHCPOFFER(br0) 192.168.1.145 56:fa:3e:92:e2:42
Jul 12 21:04:10 dnsmasq-dhcp[15147]: DHCPREQUEST(br0) 192.168.1.77 56:fa:3e:92:e2:00
Jul 12 21:04:10 dnsmasq-dhcp[15147]: DHCPACK(br0) 192.168.1.77 56:fa:3e:92:e2:00 UPCGW_E200
Jul 12 21:05:05 dnsmasq-dhcp[15147]: DHCPDISCOVER(br0) 56:fa:3e:92:e2:42
Jul 12 21:05:05 dnsmasq-dhcp[15147]: DHCPOFFER(br0) 192.168.1.145 56:fa:3e:92:e2:42
Jul 12 21:05:05 dnsmasq-dhcp[15147]: DHCPDISCOVER(br0) 56:fa:3e:92:e2:42
Jul 12 21:05:05 dnsmasq-dhcp[15147]: DHCPOFFER(br0) 192.168.1.145 56:fa:3e:92:e2:42

 

[garyd9]

See: http://www.snbforums.com/threads/block-dhcp-answers-for-specific-mac-address.18454/

(That won't stop the client from asking for an address, but it'll cause the router to reject it... which might help you to pinpoint what's going on.)

 

[sfx2000]

Jul 12 21:04:10 dnsmasq-dhcp[15147]: DHCPREQUEST(br0) 192.168.1.77 56:fa:3e:92:e2:00
Jul 12 21:04:10 dnsmasq-dhcp[15147]: DHCPACK(br0) 192.168.1.77 56:fa:3e:92:e2:00 UPCGW_E200
Jul 12 21:05:05 dnsmasq-dhcp[15147]: DHCPDISCOVER(br0) 56:fa:3e:92:e2:42

It probably is something on your network - you have something at 192.168.1.77 (UPCGW_E200) - it's the same OUI for the DHCP Discover - could be a wifi direct interface or something similar...