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Internet via ethernet/microusb

asked 2018-01-13 19:39:31 +0300

thoys gravatar image

Hello together,

i wanna make a feature request for as result of this Questions:

https://together.jolla.com/question/34747/does-jolla-support-ethernet-via-usb-to-ethernet-cable/

https://together.jolla.com/question/177658/internet-via-microusb/

It's a good feature if you can use internet on your mobilphone via LAN/Ethernet over microusb.

If you wanna use your phone in the basement, without good connection or in case u care about radiation and healthy, then you need this feature.

Thanks for makin it

Thoys

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answered 2018-01-15 15:12:16 +0300

DrYak gravatar image

Using a laptop/PC/Raspberry Pi, it's possible to do it on any Sailfish powered device, including older devices like the Jolla 1 which lack actual OTG support. The name of this class of access is called Reverse Tethering.

There's currently NO nice user-friend interface to help automate the manipulations.

On the other hand, as Sailfish is basically a full blown GNU/Linux under the hood, any HOWTO explaining how to do it on the command-line should do (ArchLinux and Ubuntu Ask tend to have nice and clear one).

Basically, you want to do two things :

Networking on the phone

  • First you need to connect the phone in Developer Mode (it shows up as a USB Networking device to the PC).
  • Then, either by using a terminal on the phone, or using SSH ( <- if you have SSH keys, you can even automate this ) you need to add the PC as a default route :
  • For IPv4:

    ip -4 route add default via 192.168.2.1 dev rndis0 metric 10 protocol static
    

    replace 192.168.2.1 with IP address of the PC side of the connection, it might be a higher number if you use DHCP (e.g.: 192.168.2.13)

  • For IPv6, if your laptop actually support masquerading it:

    ip -6 route add default via fe80:: dev rndis0 metric 10 protocol static
    

    replace fe80:: with the actual link-local random IPv6 of the PC side of the connection that was randomly generated upon pluging up. (e.g.: fe80::15d8:83f2:8d62:d74b)

Masquareding on the PC

  • You need to enable IP forwarding and Masquerading
  • Usually, most distro will have user-friendly tools (e.g.: Suse has SuseFirewall, RedHat/CentOS have firewalld, Ubuntu has Uncomplicated Firewall, other might use Shorewall, etc.)
  • Generally, in a user friendly firewall, you can simply assign the ethernet port to some 'external' group, assign the USB Networking to 'internal' group, and enable masquerading between the two.
  • The not user friendly solution :

    echo "1" > /proc/sys/net/ipv4/ip_forward
    iptables -t nat -A POSTROUTING -o rndi0 -j MASQUERADE
    

    Where rndis0 is the name of the USB Network device as seen on the PC. (Modern distro might assign instead static names like enp0s29u1u6i7

  • It is also possible to assign an actual internet-routable IPv6 address to an internal network (if you treat it as a subnetwork with a "longer-than-64bits prefix", with a statically assigned "less than 64bits" suffix, and play around with ndpproxy :

    ip -6 neigh add proxy 2001:: dev rndis0
    

    Where 2001::should be the actual static address that you assign to the smartphone, and rndis0 is the name of the USB interface on the PC.

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Asked: 2018-01-13 19:39:31 +0300

Seen: 687 times

Last updated: Jan 15 '18