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