@woozle After several days of testing, it appears the WireGuard VPN on BE550 only functions correctly for a short period immediately after setup. The issue of being unable to ping external networks...

@woozle Thanks so much! I change all 12.x.x.x to 10.x.x.x, then all works. I make big mistake with setting 12.x.x.x for private IP addresses. I thought it was just a private network where I could set...

@Joseph-TP there are two wan informations: two wireguard server settings: two client settings: two connections status: PC (12.0.2.3) wired ping TV(12.0.1.91) wired PC (12.0.2.3) wired ping ASUS...

this is my settings: I connect to vpn only with local network purpose. after connecting the vpn, I can remote to another (12.0.1.0/24) local network smothly. but I can't use internet normally.