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docs:guide-user:firewall:fw3_configurations:bridge

Bridge firewall

Introduction

  • This how-to describes the method for setting up bridge firewall on OpenWrt.
  • Follow Splitting VLANs to be able to filter traffic between VLAN ports.
  • Follow Wireless configuration to isolate wireless clients from each other.

Goals

  • Filter traffic between bridged interfaces.
    • Isolate LAN clients from each other.

Instructions

Install the packages and enable bridge firewall.

# Install packages
opkg update
opkg install kmod-br-netfilter
 
# Configure kernel parameters
cat << EOF >> /etc/sysctl.conf
net.bridge.bridge-nf-call-arptables=1
net.bridge.bridge-nf-call-iptables=1
net.bridge.bridge-nf-call-ip6tables=1
EOF
/etc/init.d/sysctl restart

Testing

Use ping, ping6 or nmap between LAN clients to verify your firewall configuration.

Troubleshooting

Collect and analyze the following information.

# Log and status
/etc/init.d/firewall restart
 
# Runtime configuration
iptables-save; ip6tables-save; brctl show
lsmod | grep -e br_netfilter; sysctl net.bridge
 
# Persistent configuration
uci show firewall; grep -v -e "^#" -e "^$" /etc/sysctl.conf

Extras

Isolating clients

Isolate LAN clients from each other.

# Disable LAN to LAN forwarding
uci rename firewall.@zone[0]="lan"
uci set firewall.lan.forward="REJECT"
uci commit firewall
/etc/init.d/firewall restart
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docs/guide-user/firewall/fw3_configurations/bridge.txt · Last modified: 2020/10/16 11:46 by vgaetera