i'm still new to OpenWRT and constantly learning a lot.
I have a WL-WN577A2 with 2 radios. I managed to run independent wifis (guest) with separate zones.
Basically, I want to use one wifi for VPN access my home wireguard router (GLiNet AC750S).
Following the documentation I was able to set up the interface / zone and after setting up a static route to the wireguard peer to get my VPN running.
However, after setting up the Wireguard client, I was not able to access internet anymore. I can get to my local pages (isp router config site etc). Even if I only setup the wireguard client in a separte zone with no connections to the radios, wifis, lan interfaces / zones, I got the same result: no internet. That interfering of zones without firewall configuration puzzles me and seems illogical.
I installed VPN-Policy Routing, but didn't find a Luci config page nor any way to manage it.
The easy info first: the router is behind an isp router (fritzbox). Without intentional port forwarding the router is not exposed to the internet. The setting is for easy remote access within the home network.
Neither Lan, wifi1 or wifi2 are forwarded to wg0 but to wan instead. Does the wireguard interface intercepts also the whole traffic from the other interfaces as well? My intention was to send the traffic down the tunnel for connected interfaces. By the way: If I connect wifi1 to wg0 thats is working correctly with full internet access incl. DNS.
@vgaetera: I read the page but do not understand how to establish the right route. I tried to activate a route exclusively for wg0 but its not working. Maybe thats because of the interception of the wg interface? A guide for my example would be extremly helpful with additional explanation why the setting has to be that way for learning highly appreceated.
The kernel maintains a routing table which contains instructions for where to send traffic. Essentially, the kernel controls everything.
Other processes can hook into the kernel to modify the routing table. WireGuard is one such process. With your original configuration, WireGuard was telling the kernel "modify the routing table so that everything (0.0.0.0/0) goes via wg0".
From the OpenWRT command line, route -n will show you the routes known to the kernel. That may help you to see the internal logic behind the answer to the question "where do I send this?".
OK, I hope I am makeing progress and learning with VPN and wireguard and openwrt.
Installing vpn-policy-routing and using the command uci set network.@wireguard_wg0.route_allowed_ips='0'
is freeing my wan/lan/wifi2.
wan/eth0.2/192.168.0.1 set as default gateway. That's the gateway from my isp route in my home network. So LAN and all devices connected / routed to wan work like charm.
For testing and conveniance a set up 3 wifi zones. the first (wifi1) routed to wg0, a the second (wifi1a) and third (wifi2) to wan.
As wlan1/wifi2 is my open 5G wifi it routes always to wan. wlan0 is / shall be my VPN wifi so is is routed wg0.
If I route it to my second zone it is open like wifi2. That is working. Thanx so far.
But if I try to set up the connection of wlan0/wifi1 to wg0 internet is blocked. VPN-Policy-Routing shows wg0/X.X.X.16 as gateway. That is the IP from my wg client. the wg server has 10.0.0.1. Under a full wireguard set up, I had to add a static route from X.X.X.16 to X.X.X.1 before it was working correctly. Now this is not working anymore. With or wihout static route. I read https://forum.openwrt.org/t/solved-site-to-site-vpn-with-wireguard-and-openwrt/72764/21 but could not understand how to adopt this to my problem.
The wireguard server shows the connection, but no real traffic.
If the issue persists, collect the diagnostics and post it to pastebin.com redacting the private parts:
ubus call system board; uci show network; uci show firewall; uci show dhcp; \
uci show vpn-policy-routing; /etc/init.d/vpn-policy-routing support; wg show; \
ip address show; ip route show table all; ip rule show; iptables-save; \
head -v -n -0 /etc/resolv.* /tmp/resolv.* /tmp/resolv.*/*
Thanx for the suggestion and help. I did it as described but it looks like a step back. wifi2 - the free wifi - doesn't allow any connections anymore and wifi1 - set as wireguard tunnel - connects but doesn't allow any internet traffic.
May I also ask for a favor: I would appreciate any explanation for changes to better understand why the change is necessary and maybe how to identify the error. (and to avoid need for help next time as I (and outher readers) hopefully better understand the problems.)
But the response times and quality of support here is awsome!!
Weird, perhaps it's related to some hardware-specific wireless issues.
Try to disable extra Wi-Fi interfaces/SSIDs, save the changes and restart the router.
Test Wi-Fi interfaces separately, only enabling one at a time.
After letting rest my device for some hours its working normal now. If no device was connected over some hours it takes some time before internet is available after connection. I will have a look.
It's my private server within my home network. Access over DynDNS provider and forwarded ports on my ISP router.
What else to tell:
After establishing the vpn routing:
PBR showed an error with the wireguard gateway X.X.X.16 (I'm still uncertain, shouldn't it be the X.X.X.1 address
from the wireguard server subnet? After disabling the routing policy, the error disappeared, but nevertheless, internet was not accessible all the time with the wireguard wifi network.