cyanogenmod - USB reverse tethering - netcfg not found (marshmallow CM13)

I have been attempting to get reverse tethering working on my phone. I have a Galaxy S5 (g900t), running cyanogenmod 13 (marshmallow)...rooted, and with busybox.

*Edit: I've made some progress. I ran this on my ubuntu machine:

sudo ip addr flush dev eth0
sudo ip addr flush dev usb0
sudo brctl addbr br0
sudo brctl addif br0 eth0 usb0
sudo ip link set dev br0 up
sudo dhclient br0

And then I ran this in the adb shell:

dhcptool rndis0

After doing this, I seem to have internet.

I can do wget -s google.com. However, it only works as su.

root@klte:/ # wget -s google.com
Connecting to google.com (4.59.40.99:80)
Connecting to www.google.com (4.59.40.99:80)

2000@klte:/ $ wget -s google.com
wget: bad address 'google.com'

I verified that I can do wget as a regular user when I am connected through cell network or wifi.

So my question is:

Why would I be able to apparently access the internet as su, but not as a regular user? I've checked my ifconfig and route settings, and they all look the same either as su or regular user. Does anyone see what I'm doing wrong?

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Config setting printouts

These settings are all the same, whether I run them as su or not. Here is my ifconfig:

1|root@klte:/ # ifconfig rndis0
rndis0    Link encap:Ethernet  HWaddr 62:91:0C:85:FD:6B  
          inet addr:192.168.22.6  Bcast:192.168.22.255  Mask:255.255.255.0
          inet6 addr: fe80::6091:cff:fe85:fd6b/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:582 errors:0 dropped:0 overruns:0 frame:0
          TX packets:126 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:62495 (61.0 KiB)  TX bytes:15839 (15.4 KiB)

And here is my route table:

root@klte:/ # route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
default         192.168.22.1    0.0.0.0         UG    0      0        0 rndis0

192.168.22.0    *               255.255.255.0   U     0      0        0 rndis0

And it appears that my DNS servers are set correctly:

root@klte:/ # cat /etc/resolv.conf  
nameserver 8.8.4.4
nameserver 8.8.8.8

Answer

I just recently stumbled across what seems to me to be a much better (or at least easier) solution for reverse tethering: gnirehtet

It sets up a VPN on the android which redirects all traffic across an adb reverse port connection. Doesn't even require root at all.