GNS3 supports a serial console for connection to a serial port of an appliance. Server1 appliance is running inside GNS3 topology. Uncomment a line starting with a keyword #Banner.Ģ.2. Now configure Ubuntu to display a security banner for SSH connections.Īll connections are monitored and recordedĭisconnect IMMEDIATELY if you are not an authorized user!Įdit a configuration file of OpenSSH sever. We can install Vim with the command.Ĭhange the hostname and add a pair hostname and an IP address 127.0.0.1 into the file /etc/hosts.Īfter reboot, the hostname is changed to Server1. I prefer Vim editor to the default installed Nano editor. Once Ubuntu is installed, we will fetch the list of available updates and upgrade the current packages with the commands below. The Server1 is running Ubuntu 16.04.3 LTS Xenial. Picture 4 - RADIUS Authentication Checking The access to the console and vty lines is authenticated against RADIUS server running on the Server1. It is also configured to send traps with the severity 5 - notification and lower (1- alerts, 7 - debugging) to syslog-ng daemon running on the Server1. The switch is synchronizes its time with the Server1 using NTP. This IP address is configured on the Server1 under IPv4 configuration. The switch is acting as default gateway with the IP address 172.16.50.254/24 configured on the interface SVI50. Traffic is loaded based on source XOR destination MAC address across the links. The links are bonded together as a single etherchannel port (L2 port-channel) using the command channel-group 1 mode on. The switchports Gi0/2 and Gi0/3 connect the switch to the Server1 and they are configured as the access ports in VLAN50. The OSPF routing protocol with Message digest (MD5) authentication password is configured on the switch. Rather than explaining every line of the configuration, we will discuss how is the vIOS-Serv-I connected into the other devices. The switch is connected with point-to-point layer3 links to the Cisco ASAv-I. Note: The configuration file of the device vIOS-Serv-I is attached here. The configuration of the services such as bonding, NTP, DHCP, Syslog-ng, DNS and RADIUS running on the server is explained in more details later. The switch vIOS-Ser-I connects Ubuntu Linux Server to DC network. The switch is running Cisco vIOS-L2, version 15.2 and it has assigned 768MB RAM by GNS3. For this reason I only share the configuration of the Cisco 元 switch that is located in our DC. The DC of this size can be hardly emulated on a single PC. Typically, modern horizontally scaled large-size Layer 3 DCs consist of thousands of servers connected to the Top of Rack (ToR) l3 switches and they follow leaf and spine design. Of course, the DC network with a single switch and the server is far away from any known DC network design. DC consists of the two devices - Server1 and the switch vIOS-Ser-I. The article focus on the Data Center (DC) configuration. The article is the fifth of the series of the articles discussing the enterprise network configuration.
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