Docker mtu 9000 v24: Help with translating [--default-network-opt=bridge=com. But I'm not able to figure out how exactly to do that - most of the veth tutorials/articles on the internet mention network namespaces and I'm not sure if I would need However, I ran into issues soon after: Docker's bridge network driver is limited to 1500 MTU, and the traffic headed over EM3 and EM4 requires an MTU of 9000. I will do this system wide and for docker like you said to 1400 MTU. My router MTU setting is 1480 and i can’t change this as this was preset by my internet service provider. As suggested by David Roble the problem and solution lies in the MTU configured for the default docker0 interface!. We are testing the feasibility of scaling docker to our HPC environment, and thus these two specific test nodes are con Problem solved, the issue was MTU size: vpn MTU: 1300 wsl2 eth0 MTU: 1280 wsl2 docker0 MTU: 1500 wsl2 br-ecf9804545ca MTU: 1500 (docker subnet) Because this wsl2 works fine(1280mtu < 1300mtu vpn) and docker containers doesn’t work (1500mtu > 1300mtu vpn), this was a really annoying problem, difficult to debug but luckily it was resolved. MTU set to 9000 on eth5 in DSM, on the win 10 card, and in the Mikrotik for both ports. means inside docker it is running with a older I'm trying to change the MTU size of my docker containers to 9000 to use jumbo frames. But I'm not able to figure out how exactly to do that - most of the veth tutorials/articles on the internet mention network namespaces and I'm not sure if I would need Starting Docker Containers: Host Networking Model. That is unlikely to have a positive impact on 1Gbit networks, Container Linux ships with Docker (or bare Containerd) and Rkt. Plex Docker Setup upvotes The sender needs to transmit large data packets to the receiver (which is on the same host with 1500 MTU) and I think this can be simulated using veth with 9000 MTU, from my reading on it. g. Then sysemctl daemon-reload and systemctl restart docker. 1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: enp6s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9000 qdisc mq state UP qlen By default, Swarm will have a MTU of 1450 (leaving 50 bytes of VXLAN overhead). teus; September 8, 2022 at 3:42 PM; Hello, I can change MTU for docker network via “-o com. 10. Is there anyway I can set the So, use it to check the MTU size allowed by your network interfaces. Looking for more tutorials on Debian 12, for other options. hi you are make 1500 mtu and Hello, I have configured docker to run containers with 9000 MTU which works fine for most containers, since macvlan is not required. Jeepers! Is MTU 9000 really required for RAC private network interfaces? Thanks, Mary My docker swarm build is as follows; 10. haskell. please help, how to modify docker0 in my k8s cluster. An overlay network provides complete isolation for the containers. My container exposes port 9000 (Xdebug's working port). 1 \ -o parent=eth0 \ -o "com. $ docker network create \ --driver overlay \ --ingress \ --subnet=10. 7Gbps. I would say Docker is most user friendly if you want to access it directly. The emulator can be configured as the import variant by using the import diode flag (--importDiode or -i) when running the management interface or emulator script. Docker/Docker Compose on bare metal in Electric Eel !!!!! forums. To put numbers to it, on a 10Gbps network performance went from 1. 1: No route to host Docker Bridge [root@0001ED logs]# ip addr show docker0 3: docker0: Stack Exchange Network. Note that though the port config is validated when using the launch_emulator script directly for ease of use, the enterprise diode itself will not validate the For IPv4, when a host sends a packet that's larger than the MTU of the receiving host or that's larger than the MTU of a device along the path, the receiving host or device drops the packet, and then returns the following ICMP message: Destination Unreachable: Fragmentation Needed and Don't Fragment was Set (Type 3, Code 4). Create an overlay network on one of the machines in the Swarm. SW5# HTH. 255. 11. The issue occurs after moving VM to another VM host. 101 - Manager 1 - Ubuntu 22. 1. Because the MTU on each interface is set to 9000, you can then run the following commands on each Docker host: to extend the maximum payload length for each network to use the entire MTU: # docker network create -d macvlan \ --subnet=10. 03. Just to start with my set up: I am running stock Ubuntu 16. - changing the MTU to 1500. . DOCKER_OPTS="--mtu=9000" moby/moby#36659 isn't fixed for me yet, but assuming at some point it is setting the MTU is currently a bit tricky for the dind image in certain scenarios. I emailed support about jumbo frame support and they replied that it is on the list of improvements. 2 netmask 255. 255 inet6 2606:b400:c13:e03: f816:3eff I am using the default docker bridge network. The native Ubuntu Linux 18. also docker container running with ubuntu 14. The user in the container can switch between the different network namespaces at /var/run/netns (corresponding to different VRFs A 20 byte IP header is a much larger fraction of a 1500 byte packet than a 9000 byte packet. On my host, the MTU value is set to 1462, but Docker uses How to configure a SSL certificate for ASP. In my case I want to run dind as a service to GitLab CI builds running in Kubernetes. 17. That Hi, I’m having issue with the MTU for the ethernet connection. A 20 byte IP header is a much larger fraction of a 1500 byte packet than a 9000 byte packet. It addresses the issue of the same curl command or request working on the host system but not in the containers. json or spinning up a new bridge network have proven unsuccessful. It registers well, and I am able to run basic Pipelines and everything is going fine until some steps of the Pipeline has to download a large file. Changes to the system jumbo MTU will not take effect until the next reload is do ne SW5(config)#end SW5#wr. The MTU is a critical ele This guide shows how to change the MTU size of Docker’s docker_gwbridge network. The user in the container can switch between the different network namespaces at /var/run/netns (corresponding to different VRFs Make a docker-compose. docker. This depends on the OS you are running. io accessible from all nodes; 2 separate networks - ceph-internal / ceph-cluster (with jumbo frames and mtu 9000) 802. 254. but after a while, the mtu goes back to 1500. Attempts to set the bridge network at MTU 9000 using daemon. 10. 1-ce on RHEL7. 167 netmask 255. yml file (see example below) in the same folder as the Dockerfile and the rest of the scripts; Create valheim sub-directory in the same folder and run chmod 777 valheim for full permissions or use chown -R 1000:1000 valheim/. For IPv4, when a host sends a packet that's larger than the MTU of the receiving host or that's larger than the MTU of a device along the path, the receiving host or device drops the packet, and then returns the following ICMP message: Destination Unreachable: Fragmentation Needed and Don't Fragment was Set (Type 3, Code 4). ~]# docker container ls -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS proxy docker registry to quay. there is a SO example that uses powershell to generate, install, and trust a self-signed cert while spinning up the container. Any advice? rodrigue7800be (Rodrigue7800be) September 4, 2023, 4:25pm 2. I checked the networks (same on manager and the worker): j4care@pacslb2:~$ ip addr | grep mtu 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 2: ens160: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9000 qdisc mq state flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 9000 inet 10. Feb 15, 2022 • Jan Ove Skogheim. I've tried using the CLI to change the interface , but while it seems to work, resetting the networking, Plex Docker Setup My container was using another user-configured network. How should the syntax be set to get the MTU working with a value 9000 ? chewitt *!@$%&* How to change Docker default folder. 2. To change the MTU size for the docker_gwbridge network, I had to first remove the stack (fg_apps) in the Swarm, make the host leave the Swarm mode ( it was a single node Swarm ) and stop the Docker service as follows: #docker stack rm fg_apps #docker swarm leave #docker swarm leave --force Changed MTU from 1500 to 9000, lost GUI and dockers, but Shares, SSH, and VMs still working. 0. Instead, Docker automatically sets its default MTU to 1500 bytes. that didnt work for me because the Starting Docker Containers: Host Networking Model. dockerfile: app1/Dockerfile ports: - "9000:8080" - "9001:8081" environment: - ASPNETCORE_ENVIRONMENT =Development - ASPNETCORE_URLS How to verify MTU size with ifconfig command? How to set MTU with IP command? How to verify MTU with IP command? How to verify the MTU packet size with ping command? 1. This instructs the transmitting host to split the A common problem when operating dockers within a virtualization infrastructure is that the network cards provided to virtual machines do not have the default MTU of 1500. 5") - - Boot drives (maybe mess around trying out the thread to put swap here too Docker image pull failing for some layers only? Apt-get stalling for some packages? janovesk. 89. None of these helped. # ifconfig eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 9000 inet 192. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. json syntax Dear community, Background I am working on my first docker container. 04. 0/16 were added for the Terraform Enterprise component Docker containers as part of a network segmentation update. 1 LTS) on Previously, the following network block did not update using docker-compose: ``` networks: default: driver: bridge driver_opts: mtu: 9000 ``` In the API, the network options were previously not being handled when the network was being created. mtu=9000" \ rac_eth0pub1_nw What should be the exact MTU size for my docker bridge network so that containers can able to communicate outside. 0/16 and 172. org. - enabling and disabling Docker setting "preserve custom user networks" - enabling and disabling Docker setting "Host access to custom networks" root@chi03:~# ip address 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127. host1 has 4521 port open for connecting to the database. We need to connect orin’s 10Gb(mgbe1_0\rj45) network with another storage device’s 10Gb network for big data transmission, so we need to set the mgbe1_0’s MTU to 9000 to achieve better performance. Previously my network ran on 9000. I am kind of lost where to go from here to resolve this issue. 2 KiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 lo: And if so, how do I do set the MTU on docker0 permanently? EDIT: I've tried adding the following line to /etc/default/docker but it doesn't take upon docker daemon or full server reboot. This is to provide better network isolation from environments running untrusted code. # ip link set eth0 mtu 9000 Jumbo frames ? mtu 9000. Most of the post are suggesting to set it to 1400. 114. Beginning in version 202104-1, Docker non-default networks tfe_services and tfe_terraform_isolation on subnet 172. 2 \ --opt com. The caveat of using the default docker network is that DNS resolution isn’t available. In particular with cabal update which fetches data from hackage. 60. Changing the MTU Size of docker_gwbridge network. json file. $ ip link show | grep mtu The numbers directly after the mtu is the value you’re looking for. mtu=9000" \ rac_eth0pub1_nw ESXi-pfSense-TrueNAS-Docker host CASE: Fractal Node 804 MB: ASUS x-99M WS CPU: Xeon E5-2620v4 + Corsair H60 Cooler block RAM: CRUCIAL 64GB DDR4-2133 ECC RDIMMs hence the MTU of 9000 can be useful to get the full throughput on a 10Gbit or more network. I will get around to it at some point. The docker container ls command can be used to ensure the containers are running. You just need to tell it which interface you want to modify and the size you want to set it to. com. 1 Storage Driver: aufs Root Dir: /var/lib/docker/aufs Backing Filesystem: extfs Dirs: 22 I'm using a docker iperf3 image to test my 10gb connectivity. After a steep learning curve and a lot of help from @meyay, the experience has been great. makakam; October 19, 2022 at 11:12 AM; Add-on Support; audio equalizer & dynamic compression. means inside docker it is running with a older value i. 131 - Nfs server - Ubuntu 22. I've been poking around , but this setup is not standard Debian 12, apparently. The question is, is it possible to change docker's MTU to 1450 on the fly? I tried: Add key to dockerd --mtu=1450 - the docker service didn't start at all; Change main network's If you’re seeing a socket hangup ERRCONNRESET in nodejs calling an HTTP/HTTPS REST API but you’re only seeing it in docker and not when run straight from I changed the mtu value in /etc/docker/daemon. WSL 2 and VPN - MTU size matters. Set A New Size. 95. 19. Inayath RunCVM (Run Container VM) is an experimental open-source Docker container runtime, for launching standard container workloads - as well as Systemd, Docker, even OpenWrt - in VMs using 'docker run` - newsnowlabs/runcvm 2 - dotnet dev-certs runs in the context of the Host; I have tried running in the context of the container it should work there while the container is being spun up, but I ran out of coffee trying to figure that out. In OpenStack configuration, the mtu size is set to 1450. I’ve set my Mac mini Server to MTU 9000 and the same for my Synology RS820RP+ and all seems to be working fine. Izumiko / docker-mihomo Public archive. I am looking, what should be the exact size with good explanation. So you got WSL networking working. I stopped the array, went into Network Settings, changed MTU for eth0 from 1500 to 9000, clicked Apply, and it just hung. If you want Docker containers to have access to all the host network interfaces, including data port and management, start the Docker containers with the --network host option. 9000 MTUs in all Public Cloud Regions Weave provides an option to set the MTU, and once set to 8950 (9000 - 50 for vxlan overhead), the performance increased dramatically. 218 metric 202 mtu 9000 And my interfaces: 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 So the next step is, we want to test if our new 9000 byte MTU is actually working and we can reap the benefits of a larger packet size (whether it’s on iSCSI, LAN, whatever) being of course a higher latency but also higher throughput. 218 metric 202 mtu 9000 169. forked from yikyo/docker. You will need to specifically pre-define the MTU of your overlay networks, last I knew, as there isn't a way to tell Docker what the MTU of your network is to have to auto-calculate the MTU based off of MTU 9000 . most of the time? Just some connections dropping out? Unfortunately, the MTU will reset to 1500 at the restart of your Linux kernel. In each on my containers running upon the same host I’m seeing the following: - Trying 172. driver. Question Hi all, I hope someone can help me. 0 broadcast 0. # ip link set eth0 mtu 9000 Because the MTU on each interface is set to 9000, you can then run the following commands on each Docker host: to extend the maximum payload length for each network to use the entire MTU: # docker network create -d macvlan \ --subnet=10. To change that I followed the below steps: Disconnect docker containers connected to the network and remove the network. By default docker0 had MTU of 1500 which I want to change MTU(Maximum Transmission Unit) inside docker which is running on ubuntu 14. I just watched SpaceInvaderOne's iPerf video and figured I'd give it a go. That's all nice but in the grand scheme of things probably not noticable unless you plan to transport gobs and gobs of data continuously. Hello, thanks for reply. 0 ether 02:42:c0:a8:01:02 txqueuelen 0 (Ethernet) RX packets 690 bytes 88273 (86. Notifications You must be signed in to change notification settings; Fork 6; Star 16. ; Start via docker compose up -d (Starts detached, you can use docker compose down to stop it); The default port for your server is I read that for 10 GbeE I can set MTU to jumbo frames with 9000. I tried to set some ports on my t my switches SX3008F & SG2008P to 9000 But i can't find the setting in Omada Software Controller Google didn't help much. This is often the case, for example, when working in a cloud infrastructure (e. 0/24 \ --gateway=10. firewalld is running on both the hosts with default configuration. Sometimes, MTU set to 9000 on eth5 in DSM, on the win 10 card, and in the Mikrotik for both ports. 4 xSamsung 850 EVO Basic (500GB, 2. Same issues. 168. VM/Docker host, using ESXi and running pfSense alongside FreeNAS (separate Dual Intel NIC added, dedicated to the pfSense VM) Other Systems 10Gbit or higher), it can be necessary to reduce the packet fragmentation by increasing the packet size, hence the MTU of 9000 can be useful to get the full throughput on a 10Gbit or more network. For that to work I need to control the MTU of the docker bridge and I have limited control of how the service is started. (In our case it was npm install) I tried to search everywhere and I If you ever run into problems, where you cannot connect to the internet from your Docker container, one reason might be incorrectly set MTU value between the host and Docker. I have just had this exact same issue, here is the fix: Hetzner fully supports VXLAN on their private networking. Ok, so I will stop the docker service, change the MTU back to /usr/sbin/ifconfig eth0 mtu 9000 up. EXPOSE 80 443 9000 Since docker machine in Ubuntu is the same as the real machine, the docker-proxy process takes the 9000 port. You can use whichever you like. I have currently a Ubuntu Server (22. 1 dev ens3 proto dhcp src 10. Visit Stack Exchange I'm running the Bitbucket Pipelines Runner in our Rancher based Kubernetes cluster. Modify Running kubernetes Cluster. ifconfig: SIOCSIFMTU: Invalid argument. 12. 3ad transmit-hash-policy: layer2+3 ethernets: enp179s0f0np0: dhcp4: true mtu: 9000 enp179s0f1np1: dhcp4: true mtu: 9000 enp180s0f0np0: dhcp4: true dhcp4-overrides : use-dns: false enp180s0f1np1 A Docker swarm generates two different kinds of traffic: Control and management plane traffic: This includes swarm management messages, such as requests to join or leave the swarm. Setting the MTU size is really easy with ip. how to change MTU inside docker container on ubuntu 14. $ docker network create --driver overlay my-multi-host-network This results in a single network spanning multiple hosts. From what I've read I need to add the following line to the /etc/defaut/docker file: When using Docker with NordLayer you may experience connectivity issues which are caused by how Docker is configuring the MTU or by the network path itself not supporting Containers: 0 Running: 0 Paused: 0 Stopped: 0 Images: 4 Server Version: 1. This is needed because Docker doesn't inherit the MTU of your networking interface, there will be intermittent packet losses when communicating between nodes! Docker by default doesn't detect the network MTU because reasons, so by default it uses 1500 MTU for connections, which will cause issues if your network has a different MTU! Hello All, My environment of multiple containers has been working perfectly for over 10 months untill today. 1Gbps to 8. 1 -o parent=enp12s0 mymacvlan on the host where it is already connected to VLAN 31 as shown on ifconfig enp12s0: I also configured the MTU in the container to 9000 using the docker engine configuration. 0/16 \ --gateway=10. This new value was reflected properly in the Docker is recognized to exhibit a peculiar behavior where it appears to disregard the network's established Maximum Transmission Unit (MTU) - a parameter that denotes the largest possible size of a data packet that can be transmitted. 4 thank you. We want to change the docker_gwbridge interface mtu size and change it to So, use it to check the MTU size allowed by your network interfaces. 0/24 dev ens3 proto dhcp scope link src 10. 40. 4. Ok, so I will stop the docker service, change the MTU back to 1500 in Network settings and I should be good to go? Jumbo frames ? mtu 9000. NET Core in a Docker container? I have a Visual Studio solution with multiple projects that I run on {DOCKER_REGISTRY-}app1 build: context: . mtu=9000" \ rac_eth0pub1_nw Introduction. 112 - Worker2 - Ubuntu 22. However, some VM hardware seems to have issues with this changing the network bound VM interfaces if a VM node is rebooted. 04 LTS release on two nodes in a test cluster environment. I have to set the MTU to 900 every time after my Hassio restarted and the MTU always defaulted to 1500 and with 1500, i can’t install addon/update supervisor/hassio. resetting the networking, it all goes back to mtu=1500. “Proxmox Cheatsheet” is published by Muhammad Adam Nur Rahman. 102 - Manager 2 - Ubuntu 22. 0 broadcast 10. 1Gbps is what what we're currently seeing with docker swarm overlay networks. - enabling and disabling bridge mode. However, in the following example, I cannot get the web interface to work after bringing up the compose file. Is there a way to change that? On one of my Jenkins slaves I've been experiencing problems when downloading files from the network. The user in the container can switch between the different network namespaces at /var/run/netns (corresponding to different VRFs I have just had this exact same issue, here is the fix: Hetzner fully supports VXLAN on their private networking. 1. Then, on each host, launch containers making sure to specify the network name. The overhead will drop from around 4% to <1%. But then you’re back to square 0 and you need to figure out if your local By default, the emulator is configured as the basic diode. Now you can see all my interfaces will be mtu 9000:-SW5#show int g1/0/1 | in MTU MTU 9000 bytes, BW 10000 Kbit, DLY 1000 usec, <<< MTU is 9000. The problem is that its docker0 interface on host os can change the MTU value from 1500 to 9000 but its doesn't gives affects inside docker os. 04 10. service. Regards. However, in the following example, I cannot get the The problem is that its docker0 interface on host os can change the MTU value from 1500 to 9000 but its doesn't gives affects inside docker os. 218 metric 202 mtu 9000 10. Right now, 1. Description Hi, We have created a cluster of nodes which we manage it by docker swarm on top of OpenStack. mtu=1442] into daemon. You’ll either need to replace manager-php-fpm:9000 with the IP of the container or remove network_mode: bridge so that the containers are in a user-defined network where DNS resolution is available. Code; Issues 0; Pull requests 0; < POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP > mtu 9000 qdisc pfifo_fast state UNKNOWN qlen 500 link/ As networking demands increase, the use of a larger MTU allows virtual machines to transfer more volumes of data and use fewer packets which undoubtedly also introduces an improvement in throughput. mtu=1450” for bridge and overlay drivers but I cannot for macvlan driver is this expected? does it have some other option to change MTU? if so, what is it? I am running Server Version: 18. 0/23 --gateway=10. Turning to 1500 introduced other problems, so I restored the MTU to 9000. Ensure jumbo frames are enabled on the private Ethernet switches. 2 KiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 617 bytes 60629 (59. 1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0: The MTU size is set to 9000 for the enablement of jumbo frames. 248. e I want to modify docker0 mtu to 1400 byifconfig docker0 mtu 1400 and it is successed. If you are talking about swarm services, started with docker service create or docker stack deploy using an overlay network, then of course the mtu size will be reduced by the 50 bytes overhead of vxlan. What is MTU in Linux? MTU stand for (Maximum Transmission Unit) it’s a size of largest protocol data unit that can communicated in single network layer transaction. network. 0 dev ens3 proto dhcp scope link src 10. 20. Before starting any containers, this is my routing tables: default via 10. This assumes you have two containers running on the same Docker network, where one container was built from the nginx image and the other container was built from the php:fpm image. The actual issue is that Docker's default network MTU is 1500, Hetzner's private network MTU is 1450, this will cause problems with Swarm communication. 5") - - VMs/Jails; 1 xASUS Z10PA-D8 (LGA 2011-v3, Intel C612 PCH, ATX) - - Dual socket MoBo; 2 xWD Green 3D NAND (120GB, 2. The sender needs to transmit large data packets to the receiver (which is on the same host with 1500 MTU) and I think this can be simulated using veth with 9000 MTU, from my reading on it. 04 Host installed with DRIVE OS Docker Containers other. 0/23) Now, I’ve tried to create a macvlan network by: docker network create -d macvlan --subnet=10. 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127. SW5(config)#system mtu jumbo 9000 << changed it manually. trungdq88@ubuntu:~/# sudo netstat -tulpn | grep :9000 tcp6 0 0 :::9000 :::* LISTEN 10391/docker-proxy hello, in our network, there is a VLAN configured with DHCP and IPAM (it is known as VLAN 31 or the 10. mtu=9000" \ rac_eth0pub1_nw Hi, I’m having issue with the MTU for the ethernet connection. Is there a way to change that? Hello, I have configured docker to run containers with 9000 MTU which works fine for most containers, since macvlan is not required. The Docker Daemon does not check the MTU of the outgoing connection at startup. I actually haven't even tested performance differences using 9000 MTU. mtu=1200 \ my-ingress Note This all based on my experience. I’ll try some transfer tests between the devices and see if I notice any increase in my transfer speeds. OpenStack). So i disabled Jumbo Frames on everything and setup an iPerf server on my Synology RS820RP+ via Docker and then setup an Starting Docker Containers: Host Networking Model. localhost is out of the scope on the picture. But if I ssh into the NAS, the MTU for the docker0 interface is still 1500. Toggle navigation. 04 Deploy mode for my two Postgres and Portainer servers pull to replicated and worker parameters “docker stack deploy Aiming to mostly replicate the build from @Stux (with some mods, hopefully around about as good as that link). I am not sure, if I did see information regarding your local lan ip-range and the type of docker network you use in your post I created a picture to show my network settings regards docker. 111 - Worker 1 - Ubuntu 22. 1 telnet: connect to address 172. Last edited by Morta (2021-11-02 16:02:28) Offline #7 If docker is happy w/ the 1400 MTU you can *independently* try to use jumbo frames on the host and if that works w/o problems and by the docker problem The mtu size of a plain docker container, started with docker run or docker compose/docker-compose should still have the same mtu size. jnsqms imwg mgkxyf wpvf azhlm ahxf wtx eblh pxfsz zdbdgg