Manual Mesh inception

These steps will outline setting up a B.A.T.M.A.N. mesh manually. I've put these steps in SystemD unit files but there's a few options you'll get to decide if you want to use the other services.

Systemd Unit files

For the Mesh Client you can specify which adapter to use and if you want to use hostapd to broadcast a wireless network bridged off the mesh then you can comment out the creation of the mesh-bridge.

Mesh Gateway

# Load Module
/usr/bin/modprobe batman-adv

# Enable IP Forwarding
/usr/bin/sysctl -w net.ipv4.ip_forward=1

# Ad-Hoc
/usr/bin/ip link set mtu 1532 dev wlan0
/usr/bin/iw wlan0 set type ibss
/usr/bin/ip link set wlan0 up
/usr/bin/iw wlan0 ibss join mesh 2462 HT20

# B.A.T.M.A.N. config
/usr/local/sbin/batctl if add wlan0
/usr/bin/ip link set bat0 up
/usr/local/sbin/batctl gw_mode server

# Set Gateway IP
/usr/bin/ip addr add 192.168.202.1/24 broadcast 192.168.202.255 dev bat0

# Start the dhcp server on bat0
/usr/bin/systemctl start dhcpd4@bat0

# This sets up routing
/usr/bin/iptables -t nat -A POSTROUTING -o int0 -j MASQUERADE
/usr/bin/iptables -A FORWARD -i int0 -o bat0 -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
/usr/bin/iptables -A FORWARD -i bat0 -o int0 -j ACCEPT

Cleanup

/usr/bin/ip link set wlan0 down
/usr/bin/ip addr flush dev wlan0
/usr/bin/iw wlan0 set type managed
/usr/bin/rmmod batman-adv
/usr/bin/ip link set mtu 1500 dev wlan0
/usr/bin/ip link del mesh-bridge
/usr/bin/iptables -t nat -D POSTROUTING -o int0 -j MASQUERADE
/usr/bin/iptables -D FORWARD -i int0 -o bat0 -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
/usr/bin/iptables -D FORWARD -i bat0 -o int0 -j ACCEPT

Mesh Client

# Load Module
/usr/bin/modprobe batman-adv

# Ad-Hoc
/usr/bin/ip link set mtu 1532 dev wlan0
/usr/bin/iw wlan0 set type ibss
/usr/bin/ip link set wlan0 up
/usr/bin/iw wlan0 ibss join mesh 2462 HT20

# B.A.T.M.A.N. config
/usr/local/sbin/batctl if add wlan0
/usr/bin/ip link set bat0 up
/usr/local/sbin/batctl gw_mode client

# Bridge Setup
/usr/bin/ip link add name mesh-bridge type bridge
/usr/bin/ip link set dev eth0 master mesh-bridge
/usr/bin/ip link set dev bat0 master mesh-bridge
/usr/bin/ip link set up dev eth0
/usr/bin/ip link set up dev bat0
/usr/bin/ip link set up dev mesh-bridge

# Set the mesh-bridge IP
/usr/bin/ip addr add 192.168.202.2/24 broadcast 192.168.202.255 dev mesh-bridge

Cleanup

/usr/bin/ip link set wlan0 down
/usr/bin/ip addr flush dev wlan0
/usr/bin/iw wlan0 set type managed
/usr/bin/rmmod batman-adv
/usr/bin/ip link set mtu 1500 dev wlan0
/usr/bin/ip link del mesh-bridge