After upgrading my MacBook Pro 13" Early 2015 to Mojave, it takes about 20-30 seconds to establish a working connection to my home wifi. It connects quickly, gets its IP address via DHCP, and I can successfully ping devices in my home network. Unfortunately it takes 20-30 seconds before I can ping any IP on the internet. DNS can not be the problem since I am pinging IP addresses.
I watched "netstat -nr" while the connection is being established and I can see that different routes are created. Just before I can ping outside IP addresses the following route is being added (192.168.111.0/24 is my home network):
192.168.111.255 ff:ff:ff:ff:ff:ff UHLWbI 0 18 en0 !
Does anyone have an idea how I can solve this?