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Overview
This document will show you how to configure a DHCP server listening to multiple VLANs. However, Abiquo recommends that you use a DHCP relay server to provide VLAN configuration.
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A DHCP server only allows 200 VLANs. If more VLANs are needed, you should set up a DHCP relay server. Abiquo recommends that you always use a DHCP relay server to provide VLAN support because it is difficult to scale this DHCP Server-only Configuration. |
Install needed packages
You need to install vconfig. This is used to create VLANs.
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# yum install vconfig |
Create configuration scripts
To generate needed files, we will use Abiquo dhcpd config script.
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# ./abiquo-dhcpd-config.py -s eth1 -v 2-200 -n 10.0.0.0 -- Generating file -- * vlans-config Script to generate VLANs and assign IPs * dhcpd Script to configure dhcpd listen interfaces -- End -- |
Configure DHCP
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server
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Ensure that the vlans-config service always starts before the dhcpd service. |
VLANs init script
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# cp vlans-config /etc/init.d/ # chkconfig vlans-config on # service vlans-config start |
DHCP server
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# cp dhcpd /etc/sysconfig/dhcpd # service dhcpd restart |
Add a single out-of-range VLAN tag
To create a single out-of-range VLAN tag e.g. a new public VLAN, edit your script at /etc/init.d/vlan-config and look for text like this:
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