[SOLVED] odd, arch linux pushing windows boxes off of the cable modem?

egenix · 2011-05-09 08:37:56

Just moved house and had cable internet installed. Two laptops in the house owned by other people can not connect to the cable modem via wifi while my
arch linux box is connected to it. I tripple checked this is the problem. Had both windows boxes online with wifi, then I connect the arch box using wpa_supplicant and dhcp and the windows boxes come offline everytime. The box im using is an imac 27' dual booting linux and osx. Osx using the same wifi card does not however knock the windows boxes off of the cable modem. I am fairly sure this has something to do with the way wpa2 psk talks to the modem, however as I dont fully understand this I cant be sure.
To set up archs password I started with a simple wpa_supplicant.conf file like so

ctrl_interface=/var/run/wpa_supplicant
ctrl_interface_group=network
update_config=1

then to get a password psk I issued

wpa_password "essid here" "a number that came with the router here" >> /etc/wpa_supplicant.conf

then just

dhcpcd wlan0

This brings up the network and runs really really well, however the windows boxes drop off the internet and just say they are connected with no internet access, I also have an htc desire running android that has no problem staying connected if the arch machine is connected or not.
The encryption on the cable modem, which is a dual cable modem and wifi box is

wpa2-personal
psk is TKIP + AES

Any help in understanding how im annoying the windows boxen would be greatly appreciated

Last edited by egenix (2011-05-11 10:52:16)

tomk · 2011-05-09 08:46:39

Any logs available on the modem/router?

egenix · 2011-05-09 08:50:56

ill just check: no, it says unsupported in the logs section. The cable modem / wifi box is a

Cisco EPC3925 EuroDOC SIS 3.0 Voice Gateway

Last edited by egenix (2011-05-09 08:54:47)

egenix · 2011-05-11 10:56:52

Found the problem, I was accidentally performing a Man In the Middle attack on the windows boxes, I bought up the wlan0 interface via DHCP
on wifi, however the ethernet port eth0 (not being used) had

eth0 192.168.0.1 netmask 255.255.255.0 broadcast

and

DAEMONS=[network ....]

and in this case the routers IP address is

192.168.0.1

so I assume arch was answering arp requests for 192.168.0.1, have now commented out the eth0 and network in DAEMONS, as I like to bring all interfaces up myself.

Last edited by egenix (2011-05-11 11:01:16)

Arch Linux

#1 2011-05-09 08:37:56

[SOLVED] odd, arch linux pushing windows boxes off of the cable modem?

#2 2011-05-09 08:46:39

Re: [SOLVED] odd, arch linux pushing windows boxes off of the cable modem?

#3 2011-05-09 08:50:56

Re: [SOLVED] odd, arch linux pushing windows boxes off of the cable modem?

#4 2011-05-11 10:56:52

Re: [SOLVED] odd, arch linux pushing windows boxes off of the cable modem?

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