VLAN Interfaces on Redhat
This step by step guide is for configuring VLAN interfaces on Redhat based operating systems.
For the following guide we will use the following data:
| Type | Value |
|---|---|
| VLAN Tag | 1000 |
| IP Address | 192.0.2.1 |
| Netmask | 255.255.255.0 |
| Device | em1 |
Step-by-step guide
How to do it:
- Determine whether the 802.1q VLAN module is loaded:
lsmod | grep 8021q
- If it is loaded, go straight to step 3, otherwise:
modprobe 8021q
- With the 802.1q module loaded into the kernel we need to determine what the interfaces are called:
ls /sys/class/net/
- Create a VLAN interface based on the primary interface (usually the lowest numbered ethernet interface – eth0, em1, eno0, bce0 etc.) by opening a new file in your favourite editor
Info: This guide is intended for single interface configurations only, VLAN interfaces on bonded interfaces follow a similar configuration, however the primary interface at this point will be called something like “bond0” as referenced in the bonding guide.
nano /etc/sysconfig/network-scripts/ifcfg-em1.1000
- In this new file, we create the configuration for the VLAN – please replace the data here with the correct interface name, VLAN tag and your preferred IP addressing schema (This should be RFC1918 private address space to avoid issues).
DEVICE=em1.1000 BOOTPROTO=none ONBOOT=yes VLAN=yes IPADDR=192.0.2.1 NETMASK=255.255.255.0 NM_CONTROLLED=no
- Bring up the VLAN interface by either restarting the networking stack or issuing the up command manually
RHEL/CentOS 5: "service network restart" OR "ifconfig up em1.1000" RHEL/CentOS 6: "service network restart" OR "ip link set em1.1000 up" RHEL/CentOS 7: "systemctl restart network" OR "ip link set em1.1000 up"
- The device should now be up and visible under the “ifconfig” or “ip address show” commands. You may test it by issuing a ping command to another machine that is already configured
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