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The Basics of Pulling an IP Address: What You Need to Know

When it comes to understanding the internet, knowing how to pull an IP address is a fundamental skill. An IP address (Internet Protocol address) is a unique identifier that is assigned to each device connected to the internet. It is used to identify and locate a device on the network, enabling communication between two or more devices. In this article, we will discuss the basics of pulling an IP address, including what it is, why it’s important, and how to do it.

What is an IP Address?

An IP address is a numerical label assigned to each device connected to a computer network that uses the Internet Protocol for communication. It uniquely identifies each device on the network and allows data packets to be routed from one device to another. An IP address consists of four numbers separated by periods, such as 192.168.1.1.

Why is Pulling an IP Address Important?

Pulling an IP address can be useful in many situations. For example, if you are troubleshooting a network issue or trying to track down malicious activity on your network, you may need to pull an IP address in order to identify the source of the problem or determine which device is responsible for the malicious activity. Additionally, if you are trying to access a website or service that requires authentication, you may need to pull your own IP address in order to gain access.

How Do You Pull an IP Address?

Pulling an IP address can be done in several ways depending on your operating system and what type of information you need. On Windows systems, you can use the ipconfig command in Command Prompt or PowerShell; on Mac systems, you can use the ifconfig command in Terminal; and on Linux systems, you can use the ip command in Terminal. Additionally, there are websites that allow you to look up your public IP address without having to run any commands or install any software.

In conclusion, knowing how to pull an IP address is essential for understanding how networks work and troubleshooting any issues that may arise with them. With this knowledge in hand, you’ll be able to identify devices on your network and access services that require authentication with ease.

This text was generated using a large language model, and select text has been reviewed and moderated for purposes such as readability.

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How to assign public IP address to Docker container, so that I can access them on my network?

I know there are several similar questions, but none seems to work for me. I’ve scoured the internet for answer for two days. I have following situation:

VM host (VMware ESXI 5.5) with centos 7, running Docker 17.06. Two docker containers, running an app. Developers need to access that app via IP in our company network. I can’t use port mapping, because the app that will connects to the containers, will throw an error of mismatching IPs (input host ip vs. container ip, which is returned to connected app). I tried creating docker network:

docker network create –driver bridge –subnet=10.0.20.0/24 –gateway=10.0.20.1 –opt “ com.docker.network.bridge.name ”=“docker1” shared_nw And then run my container:

docker run --name container1 --net shared_nw --ip 10.11.40.xxx -d someimage I am able to ping my laptop (ie. 10.140.134.56) from inside the container, but not the other way. I also tried using macvlan drivers, but to no avail.

docker network create –driver macvlan –subnet=10.0.20.0/24 –gateway=10.0.20.1 -o parent=eth0 shared_nw According to what I found online, this should be quite easy to achieve, but I haven’t been able to do so.

To use public IP thats part of company network, you would need to use macvlan driver. What is the issue that you are facing with macvlan driver? Are you trying to ping from host to container where container is located or across the network? If you are trying to ping from same host, you need a macvlan interface on host as well. In the bridge example you mentioned above, you gave subnet of 10.0.20.0/24, but ip you have mentioned 10.11.40.xxx , not sure if that is a typo. bridge network would not help your usecase since nat translation is done. For more details of Docker macvlan network plugin, you can refer my blog here( https://sreeninet.wordpress.com/2016/05/29/docker-macvlan-and-ipvlan-network-plugins/ )

Yes, I that is a typo. IP of my VM is 10.11.40.166 and my created docker network has 10.11.40.0/24. My container has ip 10.11.40.180. With the setting docker network create –driver bridge –subnet=10.11.40.0/24 –gateway=10.11.40.1 –opt “ com.docker.network.bridge.name ”=“docker1” shared_nw I was able to ping from inside the container to my PC (docker exec -it Source ping 10.140.134.56), but I am not able to ping the container from my laptop (ping 10.11.40.180).

Is the container running directly on the laptop or is there a VM in the middle? Try checking the route table in the laptop. Not sure if the nat rule is allowing 1 direction to work, but not work in another direction.

In a typical bridge network case, I have seen that the container ip is reachable from host and host ip is reachable from container. This would still not solve your public ip problem which you mentioned in your original question.

The Docker with all containers is running in VM. But our developers need to access these containers directly via ip from their computers, so they can test the changes they made to the code.

Since bridge with port mapping is not an option for you and that you want to use public ip address for container, macvlan driver is the way to go.

I’ve already tried that, is there something wrong with my setting? Or could it be, that the router does not support multiple mac adresses from single source?

is this what you are trying? Host has an underlay interface eth0 Container running on host with macvlan driver with parent interface eth0

You are trying to ping container from host?

With macvlan bridge driver, you cannot directly ping host to container, it is blocked. You need to create 1 more macvlan interface in same host and then container can communicate to host.

For macvlan driver across hosts, promiscuous mode needs to be turned on the interfaces.

No, you don’t understand. I need to ping container from another PC in the same network. I don’t care about host and containers.

Ok. In macvlan, since a single interface has multiple mac and ip, some interface drivers drop packets in ingress unless promiscuous mode is turned on. That is 1 thing I would check in your case.

It is off. It must be turned on for the switch, that means, all the virtual machines in the network would have promiscuous mode and I can’t do that.

I’m not sure if I understand your use case but I understand u do not want promiscuous mode on. But, if it is for developer’s support access via http to these applications, maybe a dedicated http reverse proxy would do? How To: attach container-based fabio/nginx/… (I used fabio for automatic service discovery based configuration) to the network you use to communicate between containerized applications (in my case it was an overlay network) and expose needed endpoints via mapped IP:port on that “router”. This way application communication scheme does not change. For improved security, it can be made accessible from your development network only. Extra features are available on proxy should you need these.

I will look into it, but from the brief reading I am not sure, it will help. My use case is following:

Our developed app needs ip and port to establish a connection to the second app. For example 10.11.40.166:2100. I have container running, which have IP 172.17.0.2 with open port 2100. So our app connects to 10.11.40.166 on port 2100 which is forwarded to our containers port 2100. BUT the app inside the container will send back response with it’s “real” IP (172.17.0.2), and there is our conflict. Our developed app compares the input IP (10.11.40.166) and the “actual” (172.17.0.2) and throws an error.

so do I get it correctly :

u want to access dockerized server by second out-of-docker client application that u now develop and that application is on non-docker network (10.11.x.y) - correct ?
You do not intend to move this client application into container - correct ?
If you publish server on 10.11.x.y then client app does some ip header comparison (what and why?) and throws an error ? ??

its only with macvlan ? or i can do it other way ?

Yes, that developed app is on non-docker network and I do not intend to move it to container, because it would be complicated for the developers if they would want to test their code (localhost). They can run the developed java app on their machine and just connect to the containers. And yes, it uses the IP and port as a unique key, so when the app connects, it asks for host details (such as hostname, ip, port, …) And that is different from user input, so it ends with error, that it cannot connect on given endpoint. Is it understandable now?

docker network create -d macvlan --subnet=172.16.9.0/24 --gateway=172.16.9.1 -o parent=eno16780032 pub_net

docker run --net pub_net --ip 172.16.9.148 -v /mnt/tomcat_PROD/conf:/opt/tomcat/conf -v /mnt/tomcat_PROD/redouteapps:/opt/tomcat/redouteapps -p 8030:8030 -d centos_java8_tomcat8.5.16

That is correct, you can’t ping the container from your host. But can you ping it from other pc in that network?

do i need to create a macvlan interface in the host ?

Docs »
Docker »
Docker Containers with Public IPs

Docker Containers with Public IPs ¶

If you need to assign public routable IP addresses directly to each individual Docker containers, using routed networks will greatly simplify your configuration.

Why routed networks? ¶

By routing a network directly to your server, allows you full control over address assignments and segmentation within the network as well as mobility as it can easily be routed to a new destination if needed.

Full control ¶

It is especially useful when running virtual machines or containerized applications that need public addressing, as it both simplifies your configuration and allows you full control over address assignment of your applications.

When a routed network prefix is routed to a server or a network device, it can be subnetted into smaller networks allowing you to create multiple networks from the prefix, inside the host or hypervisor.

Increased mobility ¶

Routed networks are defined by a network prefix and a next-hop address. The next-hop is the servers primary IP address. By changing the next-hop a whole network can easily be moved between servers.

Creating a network ¶

In this example, we have a bare-metal server where we want to provide publicly routable IPv4 and IPv6 addresses. The server has been assigned the following primary public addresses:

IPv4 address: 82.103.187.2/20 IPv6 address: 2a00:9080:9:187::1/64

The following routed subnets have been created and are being routed to the servers primary IPs:

82.103.188.0/29 2a00:9080:9:69::/64

Creating the Docker bridge network my-net using our routed IPv4 and IPv6 networks 82.103.188.0/29 and 2a00:9080:9:69::/64 .

We will configure the first usable address of each prefix as the gateway. Docker assigns the gateway IP address to the bridge interface on the host. Docker containers using the my-net network will use this IP as their default gateway to reach the Internet.

Creating containers ¶

When starting a container and specifying the my-net network, Docker will automatically assign an available address from the network to the container. On Docker networks with both IPv4 and IPv6, one of each address family will be assigned to the container.

Example of creating a new container, specifying the my-net network created above:

Assuming you want to directly assign a specific IPv4 and IPv6 address to the container:

Useful resources ¶

https://docs.docker.com/network/bridge/
https://docs.docker.com/engine/reference/commandline/run/

Assign Public IP Address to Docker Container without Port Binding

MACVLAN creates multiple virtual network interfaces with different MAC addresses. This way if your system has multiple IP addresses with MAC addresses then we can create multiple virtual network interfaces each having their own IP address and MAC address.

MACVLAN doesn’t need to learn(identify) mac addresses of the systems within the network to distribute traffic as it knows every mac address, this makes it fast and easy to setup than bridge type networking.

Problems with docker containers port binding:

If a container uses port 8000 of host then no other containers can use that port.
Binding multiple ports to container can be done by specifying port range but this operation takes more time depending on no. of ports to bind.
IPTables rules become cumbersome as no. of bindings increase.

Advantages of MACVLAN:

IPTables aren’t affected.
No port binding.
Easy to setup.
Faster than bridge networking.

Creating MACVLAN network:

Host IP: 188.40.102.103

Host subnet: 188.40.76.0

Host Mask: 26

Host gateway: 188.40.76.1

Host ethernet interface: eth0

Above command creates network named ‘macvlan_bridge’

Running a container using ‘macvlan_bridge’ network:

Host contains multiple publicly accessible IP addresses with MAC addresses.

Host additional IP/MAC: 88.99.102.115/00:50:56:00:60:42

Above command runs nginx container with ip ‘88.99.102.115’ attached to this container, you can verify by hitting ‘88.99.102.115’ where you will be welcomed with nginx page.

This way overall network setup will become clear and easy to handle.

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docker containers with "public" IPs, bridged network

I basically followed this guide: Docker Containers with Public IPs

We already have a similar setup working in another location, but I can't get it working in a new environment. Sadly, my predecessor hasn't documented anything, so im trying to reverse engineer the setup.

Docker Host: 10.10.60.41/24

with docker bridged network: docker network create --subnet=10.60.0.0/16 --opt "com.docker.network.bridge.name"="br-ext" ext

routes on docker host:

run a docker container: docker run --network=ext -itd --name=web nginx

That docker container gets IP 10.60.0.2 assigned.

ping 10.60.0.2 or curl 10.80.0.2 from the docker host is working fine...as expected.

But the docker container is not reachable from the network. A network route for 10.60.0.0/16 to the primary IP of the docker host 10.10.60.41 is set.

The two setups are basically identical, except subnets etc. But it looks like I'm missing something here...any help would be greatly appreciated.

Thanks in advance and have a nice day!

EDIT -answer to larsks

yes packets can reach the host/container: 10.10.60.6 > 10.60.1.25

even a ICMP reply is send

on the host 10.10.60.6 sending the ICMP requests, no replies

additional Infos: when sending ICMP reuqest from one of the docker container to 10.10.60.6 , this works

on 10.10.60.6 it look like this:

requests and replies to the Docker host(?)

You say, "A network route for 10.60.0.0/16 to the primary IP of the docker host 10.10.60.41 is set", but where is that set? Can you show the configuration? – larsks Aug 13, 2022 at 22:24
If you attempt to access the container from elsewhere on the network, do the packets reach your host (e.g., using tcpdump )? – larsks Aug 13, 2022 at 22:25
routes are set an the gateway: # ip r [..] 10.60.0.0/16 via 10.10.60.41 dev ens3 [..] – mab Aug 15, 2022 at 7:38
...and the second question? – larsks Aug 15, 2022 at 11:26
It's really better if you update your question when adding new information, because it's not possible to format things usefully in comments. In any case, I've added an answer since that last comment that hopefully helps a bit. – larsks Aug 15, 2022 at 15:30

2 Answers 2

I've reproduced your environment in virtual machines in order to take a look at the problem. You can find the complete configuration here .

In this configuration, I have the following three nodes:

node1 is the docker host @ 10.10.60.41 .
node2 is the router at 10.10.60.1
node3 is a random other host on the network at 10.10.60.20 .

I've created the docker network as in your example, so that on node1 , the container host, I have bridge br-ext configured like this:

And the following routing table (you can ignore the routes to 192.168.121.0/24 ; this is an artifact of how vagrant handles configuration):

And on node2 , the network router, I have:

On node3 , I have:

With the above configuration in place, if I run on node1 :

And on node3 I run:

I see in the output of tcpdump :

So, the ICMP echo requests are showing up on node1 , which means that our networking routing is correct ( node3 is sending the requests via node2 , the network router, which is correctly passing them on to node1 )...but we're not seeing any replies. What could be the reason?

One mechanism we can use to diagnose this is to enable packet tracing in our netfilter configuration on node1 :

Now when we attempt to ping from node3 to node1 , we see the following kernel logs:

(Don't forget to disable tracing at this point: iptables -t raw -F PREROUTING .)

Looking at the above logs, we see that our packet eventually entered the FORWARD chain, where it failed to match any terminal rules and eventually fell off the bottom, where it gets handled by the default policy:

Which has been set to DROP by the Docker installation:

The solution here is to add a new rule explicitly permitting traffic from the host network to the container network. On node1 :

With this rule in place, I can now ping successfully from node3 to the nginx container on node1 :

I can also successfully access the Nginx instance running in the web container:

And connectivity in the reverse directions works as well; on node1 :

This may not exactly match your configuration: for example, in your output, your FORWARD chain has a default policy of ACCEPT , which suggests that maybe something else is going on...but hopefully it suggests a few ways that you can troubleshoot the problem.

If you'd like to update your question with additional information about your environment, I would be happy to take another look.

Many thanks again! Indeed this works...i tested it again in another environment, with no problems at all, except i had to add iptables -P FORWARD ACCEPT and then it worked. I have to open a support request with the cloud provider, I think...it has to be something in their environment. – mab Aug 16, 2022 at 12:20
just a little follow up, it turned out it's like I already suspected... Subnets defined locally on the instances are unknown to Openstack and are not routed between the VMs. i didn't know that... Many thanks – mab Aug 17, 2022 at 14:20

You cannot ping a Docker container from an external host by default. By default, any service running inside a Docker container is not "Published" (Docker terminology) and cannot be reached from outside. You have to explicitly define/allow the services you want to be published when you run your container. In Your case i don't see in you docker run command any port publishing, and you are using nginx so i guess you should publish 80 at least.

Hi and thanks for your reply I know what you mean, but it's not what I/we want. When i publish/expose port 80 of the nginx service/container, then i can reach the nginx i.e. |DOCKER_HOST_IP]:80. But we want the container to be reachable over it's own IP i.e. 10.60.0.2. – mab Aug 15, 2022 at 7:34
So what you want is only possible by using other network drivers than bridge. I think for your scenario you can use IPVLAN Network driver. Here a link that describes all docker network drivers with details ' youtube.com/watch?v=bKFMS5C4CG0 ' – Salar Aug 15, 2022 at 11:34
@Salar, that's incorrect. This configuration is entirely possible using the bridge driver. – larsks Aug 15, 2022 at 13:57
@larsks I didn't say it is impossible but when you have easier options base on your need why you insist to use the hard way? – Salar Aug 16, 2022 at 8:49
You said, "what you want is only possible by using other network drivers than bridge". I'm pretty sure that is another way of saying, "it's impossible". – larsks Aug 16, 2022 at 11:45

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Engage with us, how do i deploy docker containers on separate public ip addresses.

I'm trying to run multiple containers on separate public IP addresses. I have multiple public IPs on my Linode. How do I assign a container to a specific IP address?

You can specify the IP address on which to run a Docker container along with the port when deploying it. For example, to deploy a container on port 80 of 12.34.56.78 , you could run:

This tells docker to run the container on 12.34.56.78 , and to re-direct requests from the host's port 80 to the container's port 80.

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How to Get A Docker Container IP Address - Explained with Examples

Docker provides the ability to package and run an application in a loosely isolated environment called a container.

I know what you might be thinking – come on, not another post explaining what Docker is, it's everywhere these days!

But don't worry, we are skipping that basic introduction. The target audience for this article should already have a basic understanding of what Docker and Containers are.

But have you ever wondered how to get a Docker Container IP Address?

Docker network explained

First, let's understand how the Docker network works. For that we are going to focus on the default bridge network. When you are using Docker, if you don’t specify a driver this is the type of network you are using.

The bridge network works as a private network internal to the host so containers on it can communicate. External access is granted by exposing ports to containers.

Bridge networks are used when your applications run in standalone containers that need to communicate.

In the picture above db and web can communicate with each other on a user created bridge network called mybridge .

If you’ve never added a network in Docker you should see something similar to this:

The default bridge network is listed, along with host and none . We will ignore the other two, and use the bridge network when we get to the examples.

Docker Container IP Address

By default, the container is assigned an IP address for every Docker network it connects to. And each network is created with a default subnet mask, using it as a pool later on to give away the IP addresses.

Usually Docker uses the default 172.17. 0.0/16 subnet for container networking.

Now to better understand it, we will execute a real use case.

Docker Example

To illustrate this, we will use a Hive and Hadoop environment, containing 5 Docker Containers.

Check out the docker-compose.yml file we are about to execute:

From docker-hive GitHub

No one wants to read a HUGE config file, right? So here's a picture:

Much better! Now let's start up those containers:

We can see 5 containers:

Next let's check our Docker networks:

Wait a minute... there's a new network called docker-hive_default !

By default docker compose sets up a single network for your app. And your app’s network is given a name based on the “project name”, originated from the name of the directory it lives in.

So since our directory is named docker-hive , this explains the new network.

Next some examples on how to get the Docker IP Address.

How to Get A Docker Container IP Address - examples

And now that I have your attention, we are going to unveil the mystery.

1. Using Docker Inspect

Docker inspect is a great way to retrieve low-level information on Docker objects. You can pick out any field from the returned JSON in a fairly straightforward manner.

So shall we use it to get the IP Address from the dockerhive_datanode ?

Didn't you say that Docker uses the default 172.17. 0.0/16 subnet for container networking? Why is the returned IP Address: 172.18.0.5 outside it?

To answer that we have to look at our network settings:

We executed this example in a Compute Engine VM, and in this test, the docker network was assigned a different subnet: 172.18.0.0/16 . That explains it!

Furthermore, we can also lookup all IP Addresses inside the docker-hive_default network.

So we don't need to look up each Container's IP individually:

If you didn't notice, we used jq help to parse the Containers map object.

2. Using Docker exec

In the following example we will work with the dockerhive_namenode .

3. Inside the Docker Container

We can even find other containers' IP Addresses that are inside a container in the same network:

Hive mestastore

Hive server

All examples were executed in a linux distribution Compute Engine VM. If you execute them in macOS or Windows environments the sample commands might change a bit.

Also bear in mind that those IP Addresses in the examples given are internal to the sample docker-hive_default network. So if you have a use case to connect to those containers externally, you would need to use the host machine's external IP (assuming that you are exposing the containers ports correctly). Or if you are using kubernetes, for instance, to manage your Docker containers, let it handle the IP Addresses for you kubernetes-expose-external-ip-address ?.

* Illustrations from icons8.com by Murat Kalkavan .

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[Solved]-How to assign static public IP to docker container-docker

with currently released versions of docker this isn't possible (without a lot of manual work behind docker's back), although it is seldom necessary.

docker exposes network services in containers through the use of port mappings, and port mappings can bind to specific ip addresses on your host. so if you want to have one web server at 192.168.10.10 and another webserver at 192.168.10.20 , first make sure this addresses are available on your host:

then start the first container:

and finally start the second container:

in the above commands, the -p option is used to bind the port mapping to a particular ip address. now you have two containers offering a service on the same port (port 80) but on different ip addresses.

since this question pops up on popular searches (docker assign ip container etc), the (currently) accepted answer is obsolete, and the correct one of @vonc is somewhat inconclusive (including discussion) let us summarize with an example of how it can be done and what the result is:

now the container has 10.30.0.4/24 attached; you can ping 10.30.0.4 from the host on which the commands were run. after docker stop be46 ping's don't work anymore, and after you docker start be46 pings succeed again. on the host, the following route is created:

(so the host assumes 10.30.0.1 ).

note: this completes the task of "assigning given ip to a container", but it is unclear to me for now if you could do that in the "docker swarm" context, and achieve the same level of redundancy we have there (with the assignment of ports to services).

this should now be possible with docker 1.10 and the new docker run --ip option that you now see in docker network connect .

if specified, the container's ip address(es) is reapplied when a stopped container is restarted. if the ip address is no longer available, the container fails to start. one way to guarantee that the ip address is available is to specify an --ip-range when creating the network, and choose the static ip address(es) from outside that range. this ensures that the ip address is not given to another container while this container is not on the network.

see also jessie frazelle 's blog post " ips for all the things ", and pull request docker/docker#19001 .

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Docker – How to assign static public IP to docker container

Is there any way to assign the static public IP to the container. So the container has the public IP. Client can access to container with the IP.

Best Solution

This should now be possible with docker 1.10 and the new docker run --ip option that you now see in docker network connect .

If specified, the container's IP address(es) is reapplied when a stopped container is restarted. If the IP address is no longer available, the container fails to start. One way to guarantee that the IP address is available is to specify an --ip-range when creating the network, and choose the static IP address(es) from outside that range. This ensures that the IP address is not given to another container while this container is not on the network.

See also Jessie Frazelle 's blog post " IPs for all the Things ", and pull request docker/docker#19001 .