How To Configure Dual NICs

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Copyright © 2018 Userful Corporation. All rights reserved.
(Updated 2018.01.30)

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Introduction

Userful software appliance allows admin to use dual Network Interface Cards (NICs) to create a stripped down subnet intended to isolate Userful content traffic. In certain cases doing this improves the overall stability of the network as traffic going to the zero clients will not compete for bandwidth with regular internet / intranet traffic.


This document outlines the steps required to configure dual NICs on the Userful host.

Steps to Configure Dual NICs

Configuring DHCP Server
  • Connect the first NIC cable to your corporate network using a CAT5e cable.
  • Connect the second NIC to a switch dedicated for Userful content traffic using CAT5e cable for a gigabit network or CAT6a cable for the 10gig network.
  • Next configure the DHCP server by following the below-mentioned steps:
  • Open Control Center and navigate to Settings > Network Settings tab and click the "Edit" button next to the second network interface intended to be used for the subnet.
  • Select the "Manual Network Config" option and configure the static address of the network card to the desired address. When created, the DHCP server will use the values entered to create the DHCP scope. For more details, refer to DHCP Server details section.
Please Note that no DNS or gateway is provided and is unnecessary. Network traffic in that subnet should not cross to the other adapter and vice verse.
  • Click the “Enable a DHCP Server on this network interface” checkbox to turn it on.
  • Click Save to complete the process.


Note: Do not change/edit the settings for the first NIC if it is configured to get Automatic IP Address from the router or the DHCP server.



DHCP Server Details

When the DHCP server is created, the static address assigned to the network adapter is declared as reserved and the server consumes the whole subnet excluding the one reserved.

For example: if the network interface is configured for 192.168.10.10 / 255.255.255.0, then the DHCP server will be configured to serve 192.168.10.1 to 192.168.10.254 on the 255.255.255.0 subnet with 192.168.10.10 reserved for the network adapter that the static address is configured on (therefore no IP conflicts occur).

To ensure that the packets are routed correctly, it is strongly recommended that the configured DHCP be given a unique subnet that does not overlap the intranet that the other network card is connected to. For example, if the other network card is on a 192.168.1.x / 255.255.255.0 subnet, then the isolated NIC could be assigned 192.168.2.1 / 255.255.255.0 with the 192.168.2.x subnet being used for the isolated network.

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