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DHCPREQUEST on wlan2 (lots)


i8igmac
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wlan2 ->192.168.97.1

eth0 -> 192.168.96.1

(dnsmasq.conf)

interface=eth0
dhcp-range=192.168.96.50,192.168.96.150,12h
interface=wlan2
dhcp-range=192.168.97.50,192.168.97.150,12h

so, if a device connects over eth0 or wlan2, dnsmasq will do a fantastic job...

i have a machine struggling to connect and keeps attempting a dhcp request...

May  7 08:17:04 kali dhclient: DHCPREQUEST on wlan2 to 255.255.255.255 port 67

clients that connect to wlan2 should get a new ip on the 192.168.97.subnet.

im not sure what machine continues to flood dhcprequest...

here is a network packet, i dumped with this command

tcpick -yH -C -i wlan2 "port 67"

01 01 06 00 f1 13 af 3f ff ff 00 00 0a 00 00 05 00 00 00 00 00 00 00 00 00 00 00 00 00 c0 ca 81 ee 5c 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 63 82 53 63 35 01 03 0c 06 69 70 68 6f 6e 65 37 0d 01 1c 02 03 0f 06 77 0c 2c 2f 1a 79 2a ff 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

01 01 06 00 f1 13 af 3f ff ff

ill read about this packet and find the source and destination ip. witch might be this first string...

Edited by i8igmac
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Employ a notification system: hard-block all MAC addresses that start with AF:A3:3F on the router and wait for the owner of the affected machine to come ask you why their internet is broken.

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  • 2 weeks later...
On 5/11/2016 at 2:21 AM, cooper said:

Employ a notification system: hard-block all MAC addresses that start with AF:A3:3F on the router and wait for the owner of the affected machine to come ask you why their internet is broken.

Lol, I dub it the "smoke 'em out" method

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In dutch it's called "een piep-systeem" - a beeping-system. In dutch, when you say someone 'starts to beep' ("begint te piepen") it has a slang meaning of someone being childish and/or making noise about being sorry for themselves. The use of that phrase is usually reserved for kids who are being annoying because they want something they cannot have (candy/toy/their way/whatever). In this case, it's beautifully suitable to both viewpoints to the situation - an alarm going off because something has gone awry vs someone being prissy because they discovered you made it impossible for them to have their way.

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