- Протестировано с Ubuntu, Debian, CentOS / RHEL и Amazon Linux 2. Вся наша установка сводится к запуску сценария автоматической настройки с githab, мы лишь подготовим систему, пропишем и значный ключ IPSec, логин и пароль для VPN + откроем порты для VPN в VPS от Oracle. Другие варианты установки + дополнительная настройка IKEv2 (рекомендуется) смотрите в документации автора скрипта. Небольшой эксперимент создания интернет-шлюза на Ubuntu Server. У меня дома компьютер с установленной Windows 10 и VirtualBox. Давайте создадим четыре виртуальные машины router, pc-1, pc-2 и server. Все виртуальные машины находятся в одной сети / При этом у виртуальной машины router два сетевых интерфейса: enp0s3 (сетевой мост) — смотрит в домашнюю сеть, получает ip-адрес от роутера.  У виртуальной машины router два интерфейса и она будет обеспечивать выход в интернет для pc-1, pc-2 и server. Настройка сети для router. Сначала нужно посмотреть, как называются сетевые интерфейсы в системе: $ ls /sys/class/net enp0s3 enp0s8 lo. I would like to turn my Ubuntu into a router. I want to route traffic between eth0 (/24) interface and eth1 (/8) interface. I have the following /etc/network/interfaces configuration  I have the exact same environment, where Linux host turns as a router between two NIC networks. And 'ping -I' between interfaces also doesn't succeeds, although routing functionality works fine. This option takes also an IP address  When you trying to ping using Lo as source, mention that one of the pings are still running between both Ethernet cards: $ ping -I lo ping: Warning: source address might be selected on device other than lo. PING () from lo: 56(84) bytes of data. If the length of the prefix is used sign router ubuntu, ip assumes a full-length host route. This means that the first host is contacting the router on used sign Used Sign Router Keyboard router ubuntu Learn how your comment data is processed. If your company grows and you plan on having a bigger network infrastructure, then you can check managed routers as they will probably offer more flexibility to your needs. It prints out the number of deleted routes and the number of rounds made to flush the routing table. Improve this answer.

For the sake of simplicity, we are going to configure a simple static router between two networks. Given the netmask of the first host, we are able to determine that the first network has an IP address of In order to be able to route packets from one network to another, you need to have two network interfaces : one in the Netgear Modem Router Sign In Ubuntu first network and another one in the second network. In order to keep the tutorial simple, we are going to assume that both hosts are using the router as the default gateway for their respective networks.

This means that the first host is contacting the router on the Now that you have your network interfaces names, you will configure your router with a static IP addresses. In this case, we are not using the NetworkManager : we are managing interfaces using the ifupdown utility pretty much like in old distributions.

Now that you have your router connected to both networks, you will need to add a static route between your two networks in order for them to communicate. Having two network interfaces does not mean that your kernel will naturally route packets from one interface to another.

In our case, we want to delete routes that are pointing to the In order for the packets to flow from the first network to the second, your first network card need to point to the second one and vice-versa.

First, you can create a route from the first network adapter IP address to the second network IP address. Using this rule, all packets coming using the Similarly, you can add another route in the opposite direction in order for your packets to be able to flow back.

Now that your routes are added, there is one last step that you need to configure in order for your hosts to be able to ping each other. Even if routes exist, the Kernel will not naturally forward packets to corresponding network interfaces without configuration. Now that IP forwarding is enabled, you should be able to ping from a host on the first network to a host on the second network.

Now that your setup is ready, you should be able to add new hosts to both networks and start communicating between the two networks. In this tutorial, you learnt how you can easily configure a Linux system as a static router. This setup can be quite useful if you plan on building a small network infrastructure for your company.

Instead of buying and having to configure a Cisco router, you can simply use a Raspberry Pi as a static router. If your company grows and you plan on having a bigger network infrastructure, then you can check managed routers as they will probably offer more flexibility to your needs. If you are interested in Linux System Administration , we have a complete section dedicated to it on the website, so make sure to check it out!

Not every network, especially the small and home office network, can afford it. Linux provides a zero-cost solution for the IP forwarding.

If you have a Linux system in your network, you can use it for the IP forwarding. The below section explains this process step by step with a practical example. Since the process of setting IP address varies in each OS and you can use any OS to simulate the different networks, it's not feasible for me to provide step by step instructions for each OS.

However, if you are using the Linux system for testing, you can follow the same steps which I will use to configure the IP address on my Linux system. Make a list of all gateway IPs which you assigned in your network. Now, configure all these gateway IP addresses in the Linux system.

I can assign both gateway IPs to a single network interface or can assign them to two separate network interfaces individually. Since Linux allows us to configure multiple IP addresses on a single network interface, the second option would be a waste of resources. Select available Ethernet network interface from the left pane and the Edit option from the right pane and hit the Enter key. When adding IPs, in step2, make sure you add IP with the subnet-mask in slash notation.

Slash notation is the other way to write the subnet mask along with the IP address. To know more about the slash notation and how to make or use it, check this tutorial. Subnetting Tutorial - Subnetting Explained with Examples. The nmtui tool, which we used to set the IP configuration, automatically applies all changes when quit form it.

So, technically we don't need to restart the network service. We use this command to verify that everything is configured properly.

Confirm the IP configuration. To print the IP configuration of all network interfaces, use the "ip addr" command. At this point, systems from different networks can access the default gateway, but they can't access the system of another network.

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