Hey, i dont know how mail lists work, as i dont get mails from the whole discussion. I make new Thread with all Details included. I am running Windows 10 Enterprise, Windows 10 Home. My Router is Vodafone Station (Default Router). They might have remote access to fix problems, like all isps do. When i do 1280 MTU, its fine. But its 100mbps maixmum with huge latency drops when i open some websites. My Configurations: [Interface] PrivateKey = HIDDEN Address = 10.0.0.2/32, 2a01::2/128 DNS = 20.199.177.73 MTU = 1280 [Peer] PublicKey = oyq9egDqiRTgxKbvWonrkFavvp9JcIw40EJoWmjRD3Y= AllowedIPs = 0.0.0.0/0, ::/0 Endpoint = 104.248.247.50:51820 PersistentKeepalive = 21 I did not change anything on Interface. Ubuntu Server: ip -a 2: eth0: mtu 1500 qdisc fq_codel state UP group default qlen 1000 link/ether fa:04:72:19:7f:4b brd ff:ff:ff:ff:ff:ff inet 104.248.247.50/20 brd 104.248.255.255 scope global eth0 valid_lft forever preferred_lft forever inet 10.19.0.6/16 brd 10.19.255.255 scope global eth0 valid_lft forever preferred_lft forever inet6 2a03:b0c0:3:d0::16bc:a001/64 scope global valid_lft forever preferred_lft forever inet6 fe80::f804:72ff:fe19:7f4b/64 scope link valid_lft forever preferred_lft forever 63: wg0: mtu 1420 qdisc noqueue state UNKNOWN group default qlen 1000 link/none inet 10.0.0.0/24 scope global wg0 valid_lft forever preferred_lft forever inet6 2a01::/64 scope global valid_lft forever preferred_lft forever Address = 10.0.0.0/24, 2a01:affe:affe:affe:affe:affe:affe:affe/64 Privatekey = HIDDEN Listenport = 51820 PostUp = iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE PostUp = ip6tables -t nat -A POSTROUTING -o eth0 -j MASQUERADE PostDown = iptables -t nat -D POSTROUTING -o etho -j MASQUERADE PostDown = ip6tables -t nat -D POSTROUTING -o etho -j MASQUERADE [Peer] Publickey = P7TiJbnXVvLrVCSosZL3ZK1CZHx5OEJf57Q3oejc8RI= AllowedIPs = 10.0.0.3/32, 2a01::3/128 [Peer] PublicKey = tb9edxZH0vdJYYqC8AyF83mkDjra/CoWIoTB584qWF0= AllowedIPs = 10.0.0.2/32, 2a01::2/128 Tracepath: root@ubuntu-s-1vcpu-1gb-intel-fra1-01:~# tracepath 1.1.1.1 1?: [LOCALHOST] pmtu 1500 1: no reply 2: 10.68.132.5 1.609ms asymm 1 3: 138.197.249.62 6.634ms asymm 2 4: 138.197.250.141 0.811ms asymm 3 5: no reply 6: no reply 7: no reply 8: no reply 9: no reply 10: no reply 11: no reply 12: no reply 13: no reply 14: no reply 15: no reply 16: no reply 17: no reply 18: no reply 19: no reply 20: no reply 21: no reply 22: no reply 23: no reply 24: no reply 25: no reply 26: no reply 27: no reply 28: no reply 29: no reply 30: no reply Too many hops: pmtu 1500 Resume: pmtu 1500 Endpoint is always ipv4. What is the problem here? Now, im in Hotel Wifi and 1420 MTU works. But i didnt make something on Network, i dont understand what is wrong... My Server is Ubuntu Server 20.04 LTS with kernel module.