Problem to establish a connection with ISP Telekom

[PlanetDyna]

@Trendy: Thanks for your help! Unfourtunately its not working. I have opened a seprate Thread for this issue.

Port-Forwarding not working properly

Hello, even though the problem I describe below probably does not concern OpenWRT, I still ask for your help. Maybe someone has an idea what the problem is. I use three routers in my home network. These are a Draytek Vigor 165, Linksys WRT1900ACS and AVM Fritzbox 7590. The Vigor, Linksys as well as the Fritzbox are connected in this order via WAN port and have their own IP address range. The latter, the Fritzbox, is used exclusively for DECT telephony. The Vigor establishes the Internet connec…