No Internet but connection to DNS

To start off, im not an Ubuntu Expert (or even remotely), so please bear with me.

I want to have an ubuntu Server which should be connected to 2 IP Adress Ranges: 10.1.1.X (which is connected to the Internet) and 10.1.5.X (which is connected to a couple local machines).

Now the Setup used to work (I had an Internet Connection) when I used the DHCP Server Adress in 10.1.1.X and I didnt change anything Hardware Wise. I changed the NetworkManager conf and for locally connecting, everything works as it should (I can reach the Server over 10.1.1.200 and 10.1.5.3).

I can even ping my DNS Server from ssh over 10.1.1.200 (10.1.1.10 / 10.1.1.101) but I cannot connect to the Internet:

ip a; ip r; cat /etc/netplan/*.yaml reveals the following:

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group defaul     
                                                                                                                              t qlen 1000

    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00

    inet 127.0.0.1/8 scope host lo

       valid_lft forever preferred_lft forever

    inet6 ::1/128 scope host

       valid_lft forever preferred_lft forever

2: ens160: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group de     
                                                                                                                              fault qlen 1000

    link/ether 00:0c:29:f1:4a:3f brd ff:ff:ff:ff:ff:ff

    altname enp3s0

    inet 10.1.1.200/24 brd 10.1.1.255 scope global noprefixroute ens160

       valid_lft forever preferred_lft forever

    inet 10.1.5.3/24 brd 10.1.5.255 scope global noprefixroute ens160

       valid_lft forever preferred_lft forever

    inet6 fe80::20c:29ff:fef1:4a3f/64 scope link

       valid_lft forever preferred_lft forever

10.1.1.0/24 dev ens160 proto kernel scope link src 10.1.1.200 metric 100
10.1.5.0/24 dev ens160 proto kernel scope link src 10.1.5.3 metric 100

169.254.0.0/16 dev ens160 scope link metric 1000



Let NetworkManager manage all devices on this system

network:

  version: 2

  renderer: NetworkManager

  ethernets:

     ens160:

            addresses:

                - 10.1.1.200/24

                - 10.1.5.3/24

            nameservers:

                addresses: [8.8.8.8, 1.1.1.1]

This is my /etc/resolv.conf

 Generated by NetworkManager

nameserver 8.8.8.8

nameserver 1.1.1.1

If I do host google.com it will only give me:

;; connection timed out; no servers could be reached

Do you guys know what might help ? I have no clue where I went wrong.

Thank you!