Ubuntu Laptop as a wireless hotspot on bridge mode
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nixnotwin
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Published on 2011-01-15T03:58:03Z
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2011/01/15
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I have a wired router to which my ubuntu laptop connects via ethernet. The wierless NIC of the laptop acts as a wireless hotspot on master mode. I use hostapd fo this. I have bridged eth0 and wlan0, so my wireless clients that connect to my laptop over wifi get ip from the wired router via dhcp, so the devices get registered at the wired router ( and the laptop is just an access point). I use the following commands to get my laptop+accesspoint working:
sudo brctl addbr br0
sudo brctl addif br0 eth0
sudo hostapd /etc/hostapd/hostapd.conf &
sudo dhclient -d br0 &
sudo ifconfig wlan0 192.168.1.15 netmask 255.255.255.0 up
sudo brctl addif br0 wlan0
These commands enable me to access internet on my wireless clients and also on the laptop which is acting as wireless accesspoint. But if I reboot the wired router (without rebooting the laptop that is acting as accesspoint), Internet access on the laptop+accesspoint gets lost, but on wireless clients it works fine. Even I have not been able to figure out a command which will reset the laptop interfaces to default settings, so everytime the router reboots, I have to reboot the laptop too to get into default settings so that I can re-enter the above mentioned commands. My first question is How can I have my bridge+accesspoint up and running even-though the router reboots? And is there a command to set the interfaces to a default state? (ifdown -a doesn't work, after issuing the command the bridge still remained).
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