GNS3 LINUX DUPLICATE PACKETS TUN0 INSTALL
GNS3 LINUX DUPLICATE PACKETS TUN0 WINDOWS

In Debian/Ubuntu variants: apt-get install uml-utilities In RHEL/CentOS variants: yum install uml-utilities In Linux we will be creating a loopback (TAP) interface, connect the GNS3 router to it and configure NAT using IPTables to forward packets from the loopback interface to the physical network port of the computer. A package is needed which can be installed using the following commands. In case the physical computer is using WiFi the problem will arise because a secured WLAN uses WPA/WEP hence the GNS3 router will fail to communicate with your WiFi router itself. In this case directly connecting the router to the physical computer’s ethernet port shown in the previous step does not make it work because the GNS3 router will also be needing a public IP address to communicate. Your setup comes under this scenario if your physical machine uses WiFi to communicate with your modem or you are using a modem which assigns a public IP address directly to the physical interface of your computer. (WiFi or physical interface has a public IP address) Connecting GNS3 to the Internet – Scenario 2 That’s all, now scroll down to the last part of configuring NAT and DNS servers. Try pinging a public IP address such as 8.8.8.8, if you ping a domain name such as you’ll receive an “Unrecognized host or address, or protocol not running” error as we have not yet configured DNS. If you assigned the IP address manually a default route has to be added to ensure internet connectivity. If you had choose the DHCP way of assigning IP address you will see the following line *Mar 1 01:24:31.751: %DHCP-6-ADDRESS_ASSIGN: Interface FastEthernet0/0 assigned DHCP address 192.168.1.101, mask 255.255.255.0, hostname R1 R1(config-if)#ip address dhcpĮlse assign the a static IP address R1(config-if)#ip address 192.168.1.3 255.255.255.0īring this interface “up” R1(config-if)#no shutdown Now if the modem/router connected to the physical computer has a built in DHCP server use the following command to configure the router port to recieve IP address via DHCP. Select and add the network interface of the physical computerĬonnect a router to this cloud using an ethernet link, open the console of the router and navigate to the interface which is connected to the cloud node.

GNS3 LINUX DUPLICATE PACKETS TUN0 WINDOWS

Place a cloud node in your topology, right-click select configure and from the drop down list under the ethernet tab select “Local Area Connection” on Windows or “eth0” on Linux and click OK. Open GNS3 as an administrator (Windows) by right clicking it and selecting “Run as administrator” or as a root user (Linux) by using the sudo command. This is the simplest means of connecting GNS3 to the internet. In this scenario your physical machine is connected to a modem/router using a RJ45 cable and the ethernet port of your computer has a private IP address assigned manually or via DHCP. (Physical interface has a private IP address)

Connecting GNS3 to the Internet – Scenario 1 Apart from making configuration changes to your operating system NAT has to be configured on the emulated router that connects to the internet. But if you are using a WiFi connection/Data card/a device that requires you to assign a public IP on the physical interface getting your lab to access the internet requires a few more commands in Linux or a few more clicks in Windows. If you just have an ADSL modem/router connected to the ethernet port of your physical machine having a private IP address it is very simple to get your lab to the internet. There are many ways to do this based on what internet connection you are using.

Connecting GNS3 to the internet is just another step to bring your emulated network lab closer to real gear.

Gns3 linux duplicate packets tun0