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readme: add instructions on how to setup a bridged tap.

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Dario Nieuwenhuis 2021-10-19 03:06:37 +02:00
parent 03492be337
commit 55c22b9865
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@ -222,6 +222,45 @@ sudo iptables -t nat -A POSTROUTING -s 192.168.69.0/24 -j MASQUERADE
sudo sysctl net.ipv4.ip_forward=1
sudo ip6tables -t nat -A POSTROUTING -s fdaa::/64 -j MASQUERADE
sudo sysctl -w net.ipv6.conf.all.forwarding=1
# Some distros have a default policy of DROP. This allows the traffic.
sudo iptables -A FORWARD -i tap0 -s 192.168.69.0/24 -j ACCEPT
sudo iptables -A FORWARD -o tap0 -d 192.168.69.0/24 -j ACCEPT
```
### Bridged connection
Instead of the routed connection above, you may also set up a bridged (switched)
connection. This will make smoltcp speak directly to your LAN, with real ARP, etc.
It is needed to run the DHCP example.
NOTE: In this case, the examples' IP configuration must match your LAN's!
NOTE: this ONLY works with actual wired Ethernet connections. It
will NOT work on a WiFi connection.
```sh
# Replace with your wired Ethernet interface name
ETH=enp0s20f0u1u1
sudo modprobe bridge
sudo modprobe br_netfilter
sudo sysctl -w net.bridge.bridge-nf-call-arptables=0
sudo sysctl -w net.bridge.bridge-nf-call-ip6tables=0
sudo sysctl -w net.bridge.bridge-nf-call-iptables=0
sudo ip tuntap add name tap0 mode tap user $USER
sudo brctl addbr br0
sudo brctl addif br0 tap0
sudo brctl addif br0 $ETH
sudo ip link set tap0 up
sudo ip link set $ETH up
sudo ip link set br0 up
# This connects your host system to the internet, so you can use it
# at the same time you run the examples.
sudo dhcpcd br0
```
### Fault injection