To create the rule file for eth0, run the following command: vi /etc/sysconfig/network-scripts/rule-eth0Īdd the following contents to the rule file (adjust the IP address accordingly, and make sure that you specify the IPv4 address in the configuration): from 10.0.1.4/32 table eth0-rt If you have more network interfaces, create the same set of rule-eth# and route-eth# files for each interface by using the corresponding IP and subnet details. Replace the IP address and subnet information accordingly in every step. Use the following steps to create one set of rule-eth# and route-eth# files per network interfaces. To make sure that the network services are restarted, run the following command: systemctl restart networkĬreate corresponding rule and route files, and add appropriate rules and routes to each file. If the line isn't there, add it manually. Verify that the NM_CONTROLLED=no line is added to both the /etc/sysconfig/network-scripts/ifcfg-eth0 and /etc/sysconfig/network-scripts/ifcfg-eth1 files. Sed -i 's/NM_CONTROLLED=yes/NM_CONTROLLED=no/' /etc/sysconfig/network-scripts/ifcfg-eth1 Sed -i 's/NM_CONTROLLED=yes/NM_CONTROLLED=no/' /etc/sysconfig/network-scripts/ifcfg-eth0 To do this, run the following commands: cp -rp /etc/sysconfig/network-scripts/ifcfg-eth0 /tmp/ifcfg-eth0.bkpĬp -rp /etc/sysconfig/network-scripts/ifcfg-eth1 /tmp/ifcfg-eth1.bkp
Change the value of NM_CONTROLLED from yes to no. To make the change persistent and applied during network stack activation, edit /etc/sysconfig/network-scripts/ifcfg-eth0 and /etc/sysconfig/network-scripts/ifcfg-eth1 (eth2, eth3, and so on, if the VM has more than two network interfaces). Sed -i '/HWADDR/,$d' /etc/sysconfig/network-scripts/ifcfg-eth1 Sed -i '/DHCP_HOSTNAME/,$d' /etc/sysconfig/network-scripts/ifcfg-eth1 Sed -i 's/DEVICE=eth0/DEVICE=eth1/' /etc/sysconfig/network-scripts/ifcfg-eth1 To do this, run the following commands: cat /etc/sysconfig/network-scripts/ifcfg-eth0 > /etc/sysconfig/network-scripts/ifcfg-eth1 You can create new network interface configuration files based on the ifcfg-eth0 file (by modifying the DEVICE line and removing the DHCP_HOSTNAME and HWADDR lines from the new file). Make sure that a configuration file exists for each network interface in the /etc/sysconfig/network-scripts/ directory. Interfaces (the output of ip address show): lo: inet 127.0.0.1/8 scope host loĮth0: inet 10.0.1.4/24 brd 10.0.1.255 scope global eth0Įth1: inet 10.0.1.5/24 brd 10.0.1.255 scope global eth1Īdd two routing tables to /etc/iproute2/rt_tables by running the following commands: echo "200 eth0-rt" > /etc/iproute2/rt_tablesĮcho "201 eth1-rt" > /etc/iproute2/rt_tables x VMsĪssume that the VM has two network interfaces that have the following settings: Configure multiple network interfaces for RHEL/CentOS 7. Run all the commands in the following sections by using root privileges (by switching to the root or by using the sudo command utility). For example, traffic that belongs to eth1 can't be processed correctly by the defined default route.
Otherwise, traffic can't be processed correctly. These rules enable the VM to send and receive traffic that belongs to a specific network interface. When you add multiple network interfaces to a Linux VM, you have to create routing rules. Configure guest OS for multiple network interfaces The configuration can also be used on a VM that has more network interfaces on the same or different subnets in the same VNET. Connectivity is tested from another VM in the same virtual network (VNET) or subnet.įor details, see the following screenshot.The VM has two network interfaces in the same subnet.
This article provides the required configuration for multiple network interfaces to work in an Azure Linux VM that's based on the following sample scenario: A common scenario is to have different subnets for front-end and back-end connectivity, or a network that's dedicated to a monitoring or backup solution. You can create an Azure VM that has multiple network interfaces attached to it.
MAC ADDRESS UBUNTU 18.04 HOW TO
This article discusses how to configure multiple virtual network interfaces in Azure Linux virtual machines (VMs) that run the most common Linux distributions.
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