@lkakas Well then I don't have a quick fix for you, let's hear what @Clive_A says about this.

@lkakas ok, yes then it seems strange, I have an ER8411 myself but haven't had the same problem, have you tried changing the network cable? I use SFP+ WAN1 for internet but have previously used...

@lkakas you should upgrade to the latest firmware, the one you have is old and a lot has been fixed in the last year

@Cdn_Brad use a DDNS provider that is supported by TP-Link, I myself use no-ip which works well with TP-Link. connect to vpn site to site with FQDN

@uguryilmax Are there hundreds of users or is it max a hundred? Hundreds of users then you need an ER8411, if there are max hundred users then an ER7412-M2 or ER707-M2 is enough

@Gusimelo yes it is possible but you must include ip pool on OpenVPN or Wireguard in Ipsec site to site remote and local networks, on the OpenVPN server you should not do anything if you have a full...