VLANs in OpenWrt 21

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The VLAN Konfiguration has changed in OpenWrt 21.02 – Bridge VLAN Filtering and Distributed Switch Architecture (DSA) change the way we configure the network segmentation in a Guest, IOT and LAN Network.

00:00 Intro
00:58 TLDR – Chapter overview
01:15 Recap VLANs
04:24 Recap Version 19
08:13 Version 21 – 802.1Q VLANs
08:51 implicit/explicit configuration
10:53 Version 21 – DSA and bridges
12:12 Bridge VLAN filtering
16:07 egress/ingress/tagged/untagged explained
20:50 adding Wi-Fi to a VLAN
22:04 configuring a 2nd access point
24:30 Best practices and tips

Related videos:

Extend a Guest Wi-Fi to a second accesss point https://youtu.be/4t_S2oWsBpE
Configure the Firewall on OpenWrt https://youtu.be/UvniZs8q3eU
Wi-Fi Fast Roaming https://youtu.be/kMgs2XFClaM
Build a managed switch with OpenWrt https://youtu.be/yCV-08tSwe8

Commands I type or use:

cd /etc/config
cp network network.bak
opkg update
opkg install diffutils
while true; do clear ; diff network network.bak ; sleep 1 ; done

to check if IP4 forwarding is active:

cat /proc/sys/net/ipv4/ip_forward
(0: not active, 1: active)

to disable forwarding (does not survive reboot):

echo “0” (gt) /proc/sys/net/ipv4/ip_forward

(replace (gt) with the “greater” sign)

to survive reboot:
add net.ipv4.ip_forward=0
into the /etc/sysctl.conf file

The Linux Kernel DSA Documentation is here: https://www.kernel.org/doc/Documentation/networking/dsa/dsa.txt

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