Guest Wi-Fi basics

  • Guest Wi-Fi provides an isolated wireless network which is independent from your main WLAN.
  • Guest clients have internet connectivity and restricted LAN connectivity.
  • Follow Guest Wi-Fi extras for additional tuning.
  • Create an open wireless network independent from the main WLAN.
  • Provide internet connectivity to guest clients and restrict LAN connectivity.

Set up a guest network interface.

# Configure network
uci -q delete network.guest_dev
uci set network.guest_dev="device"
uci set network.guest_dev.type="bridge"
uci set"br-guest"
uci -q delete network.guest
uci set network.guest="interface"
uci set network.guest.proto="static"
uci set network.guest.device="br-guest"
uci set network.guest.ipaddr=""
uci commit network
service network restart

Set up a wireless interface bound to the guest network interface.

# Configure wireless
WIFI_DEV="$(uci get wireless.@wifi-iface[0].device)"
uci -q delete wireless.guest
uci set wireless.guest="wifi-iface"
uci set wireless.guest.device="${WIFI_DEV}"
uci set wireless.guest.mode="ap"
uci set"guest"
uci set wireless.guest.ssid="guest"
uci set wireless.guest.encryption="none"
uci commit wireless
wifi reload

Secure the guest network and isolate its clients if necessary.

Configure a DHCP pool for the guest network.

# Configure DHCP
uci -q delete dhcp.guest
uci set dhcp.guest="dhcp"
uci set dhcp.guest.interface="guest"
uci set dhcp.guest.start="100"
uci set dhcp.guest.limit="150"
uci set dhcp.guest.leasetime="1h"
uci commit dhcp
service dnsmasq restart

Configure firewall for the guest network. Allow to forward traffic from the guest network to WAN. Allow DHCP requests and DNS queries.

# Configure firewall
uci -q delete firewall.guest
uci set firewall.guest="zone"
uci set"guest"
uci set"guest"
uci set firewall.guest.input="REJECT"
uci set firewall.guest.output="ACCEPT"
uci set firewall.guest.forward="REJECT"
uci -q delete firewall.guest_wan
uci set firewall.guest_wan="forwarding"
uci set firewall.guest_wan.src="guest"
uci set firewall.guest_wan.dest="wan"
uci -q delete firewall.guest_dns
uci set firewall.guest_dns="rule"
uci set"Allow-DNS-Guest"
uci set firewall.guest_dns.src="guest"
uci set firewall.guest_dns.dest_port="53"
uci set firewall.guest_dns.proto="tcp udp"
uci set"ACCEPT"
uci -q delete firewall.guest_dhcp
uci set firewall.guest_dhcp="rule"
uci set"Allow-DHCP-Guest"
uci set firewall.guest_dhcp.src="guest"
uci set firewall.guest_dhcp.dest_port="67"
uci set firewall.guest_dhcp.proto="udp"
uci set"ipv4"
uci set"ACCEPT"
uci commit firewall
service firewall restart

Connect to the guest network. Check your internet connectivity.

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

Collect and analyze the following information.

# Restart services
service log restart; service network restart
service dnsmasq restart; service firewall restart
# Log and status
logread; netstat -l -n -p | grep -e dnsmasq
# Runtime configuration
pgrep -f -a dnsmasq
ip address show; ip route show table all
ip rule show; ip -6 rule show; nft list ruleset
head -v -n -0 /etc/resolv.* /tmp/resolv.* /tmp/resolv.*/*
# Persistent configuration
uci show network; uci show wireless; uci show dhcp; uci show firewall
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  • Last modified: 2023/10/15 20:21
  • by vgaetera