PC<->eth1(usb adapter)<->eth0<->internet

[VladyslavVolskyi]

Hello Everyone, who is reading this topic

Could You help me to make suck kind of work.
I want to connect my PC with ethernet cable to usb adapter(USB-Ethernet)-> eth1 on raspberry pi(raspbian) routing trafic from eth1 to eth0, and eth0 will be connected to router with Internet. What and how should i do it, that at the result my PC will have Internet conection.
I use Raspbian stretch lite.
The main problems i have:

1) which ip address should be gived on each device and how, as i used a lot of different utilities.
2) How to route trafic from eth0<->eth1. Tried different programs and itables too, but it is very difficult for me.


At the end i want to achieve - filter packages from my PC on rpi. I am a new user of rpi and raspian.

[vladnt]

You must configure NAT
something similar..... ))))
1. Add or fix string net.ipv4.ip_forward=1 in /etc/sysctl.conf
2. iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

Google search iptables NAT )

[thagrol]

You could use bridging rather than NAT. With bridging, you PC would get it's IP address etc from your router.

Take a look at https://wiki.debian.org/BridgeNetworkConnections it's for debain but that's what raspbian is based on.

[pi-anazazi]

...I use some raspis with 2 (two) USB-ethernet adapters in bridged mode running Wireshark (monitoring internet traffic of the "PC" in your example, which is coupled to one of the USB-RJ45), using the built-in RJ45 to access the (headless) raspi.

Bridging the two USB-devices (as sudo):

Code: Select all

ifconfig eth1 -arp promisc 0.0.0.0 up 
ifconfig eth2 -arp promisc 0.0.0.0 up 
brctl addbr br0 
brctl addif br0 eth1 
brctl addif br0 eth2 
ifconfig br0 -arp promisc 0.0.0.0 up