Blog Archives

Adding Networking Services to a VM and Integration with Junos

This post shows a guideline for basic installation of an Ubuntu VM in order to provide basic networking services like NTP, Syslog, RADIUS, FTP, and Cacti Monitoring server for Juniper SRX Router/Firewall. It’s going to be a long post so you’d better fasten your seat belt.


  • vMX/vSRX
  • Any Linux based image
  • VMware/Virtual Box/ESXi

Here we’ll be using vSRX image and Ubuntu Desktop emulated on VMware workstation, below you can find how to setup vSRX on VMware if you needed a reference.


First we’ll start by preparing the VM so as to be able to provide these services.

You’ll need to add 2 NIC for the Ubuntu VM so that you can get Internet access from one NIC and to connect to the SRX via the other NIC. Here we have adapter1 connected as NAT interface, and adapter 2 in connected to the same VMNET/LAN segment of the SRX.

Capture.JPG Read the rest of this entry


Trouble Shooting OSPF Adjacency Problems (2)

In the last post we’ve discussed some of the reasons that could lead to OSPF adjacency problems, in today’s post we are going to look at the below reasons and we shall continue the rest of the reasons in a subsequent post.

  • Mismatched interface types.
  • OSPF priority is set to 0 on both sides.
  • Mismatched area IDs or mismatched area types.

We’ll continue to work on the same topology as below.


Read the rest of this entry

Juniper Aggregated Ethernet Interfaces


In this blog, we’ll be discussing one of the most High Availability protocols that’s broadly used in today’s networks that is Link Aggregation Control Protocol (LACP) and Link Aggregation Groups (ALG)

LACP is a method of bundling several physical interfaces to form one logical interface, which is advantageous in providing more bandwidth and increasing redundancy, On Cisco devices this is referred to as Ether-Channel.

It’s worth noting that the load-balancing hash algorithm for IP traffic uses criteria at Layer 2, Layer 3, and Layer 4. No configuration is necessary to enable load balancing. The load-balancing hash algorithm for non-IP traffic uses source and destination MAC addresses.

LACP exchanges are made between actors and partners. An actor is the local interface in an LACP exchange. A partner is the remote interface in an LACP exchange. LACP is defined in IEEE 802.3ad,  Aggregation of Multiple Link Segments and was designed to achieve the following:

  • Automatic addition and deletion of individual links to the aggregate bundle without user intervention
  • Link monitoring to check whether both ends of the bundle are connected to the correct group

Note that the Junos OS implementation of LACP provides link monitoring but not automatic addition and deletion of links.

The LACP mode can be active or passive. By default, when LACP is configured its mode defaults to the passive mode on aggregated Ethernet interfaces. To initiate transmission of LACP packets and response to LACP packets, you must enable LACP active mode.

Note that LACP exchanges protocol data units (PDUs) across all member links to ensure each physical interfaces is configured and functioning properly. Read the rest of this entry