I need to connect a wifi device to my Linux computer. There is no router in between the two. Just my computer and the device. The device has a fixed IP, 192.168.0.10. It has its own Wifi interface built in It isn't capable of connecting to a router. It has a fixed IP address.
My home wifi network uses 192.168.1.x. It has a router. It works fine. My computer connects to it via its built in wifi interface.
I have added a USB wifi interface (dongle) to my computer to connect to the device. My computer displays the device properly in a network manager scan. So the device is available for connections.
Next I edit the connection for the device in network manager. The SSID is filled in from the scan. I select Ad-hoc mode. Band, Channel, etc. are all automatic.
Next I edit wifi security. The device is open security wise, so I select None.
Next I edit the IPV4 tab. Under connection method I select Manual.
The next fields are DNS server and Search Domains. In a point to point connection, there will be no DNS server. I leave the boxes blank.
Next up is adding the static IP address, netmask and gateway.
I set the address of my interface to be 192.168.0.123, because it was recommended by another user who connected with an Apple device. I set netmask to 255.255.255.0.
The next thing to set is the gateway address. Here is where I get confused. What is a gateway in the context of a peer to peer connection ? I try to leave it blank, but it won't let me. So I put in 0.0.0.0. I also tried the address of the interface (192.168.0.123) and the address of the device (192.168.0.10)
Then there is a route field. I add a route for the ip address 192.168.0.10, using a netmask of 255.255.255.0 and again it asks for a gateway. I tried 0.0.0.0, the device address and the interface address.
I don't touch any of the IPV6 settings because the device doesn't support IPV6 addresses.
I save everything and connect to the device successfully.
I run "arp -a" and the device is found connected to the interface. Yippee !
Pinging the device fails. Destination Host Unreachable.
When I ping the device and watch in wireshark I see an ARP broadcast message "Who has 192.168.0.10 ? Tell 192.168.0.123". 192.168.0.123 is the static IP for the interface. And that is as far as the process gets.
When I watch the other interface and do a ping to a local device, I see the same ARP broadcast message, but also a reply message to it. 192.168.1.142 is at <device MAC> And then the process continues successfully.
So what am I missing in the setup of my adhoc connection such that the OS knows that a message sent to my device (192.168.0.10) gets routed through the USB wifi interface, ie the ARP broadcast message gets a reply ?
Thanks.
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