Search Results for: pat
Juniper Screenos : Redundant multi-exitpoint ISP routing failover using multiple vrouters, multiple OSPF areas and eBGP
Introduction As you most likely already know, Juniper screenOS supports a couple of dynamic routing protocols (OSPF, BGP, RIP). These protocols can be used to build very powerful and redundant networks, however there are some screenos specific issues with these implementations, and these issues may introduce a little bit of complexity in the design and […]
Nessus/OpenVAS wrapper for ike-scan
ike-scan is a great tool to audit VPN/IPSec implementations. This tool, which runs under Lunix, Unix, MacOS and Windows, can be found at www.nta-monitor.com/tools/ike-scan/ (Latest version at time of writing is 1.9). My Nessus ike-scan NASL wrapper may or may not work with earlier versions or newer versions, so test test test) Some of the […]
Monitoring your network with Powershell
I have written a small powershell script that will help you to monitor various hosts on your network. Instead of using ping to see if a host is alive, this script will connect to tcp ports, so you can also monitor hosts behind firewalls (or hosts that cannot be pinged). In addition to this, you […]
Using Fedora 9 as an OSPF / BGP router (Quagga / Zebra) and set up BGP between Linux and Juniper ScreenOS
In this post, I’m going to show you how to set up a Linux host (Fedora Core 9) and use it as a BGP enabled router. In order to fully understand the setup & configuration, please have a look at this blog post first, because I’ll use the setup in that post as a foundation […]
Juniper ScreenOS BGP Basics : a simple iBGP test case
As explained in one of my earlier posts, ScreenOS supports a couple of ways to provide for dynamic routing. Today, I’m going to explain some basic implementations of BGP on ScreenOS. Unlike my post on OSPF, I won’t be going too much into all the details of what BGP is and how it works, but […]
Dynamic Distribution Lists not working as expected (0 recipients during mail routing)
Today, I encountered an interesting problem which appeared to be strange behaviour in Exchange 2007 at first, but fianlly ended up being a small configuration mistake. It just was not that easy to troubleshoot(but in the end, it all makes sense) This is what happened : I created a dynamic distribution list, based on company […]
Using 2 internet links with Juniper screenos Firewalls to separate traffic (pbr) and apply traffic shaping
Scenario : you have 1 Juniper firewall, which has 2 internet connections : an expensive but reliable 4Mbit connection, and a fast, less expensive, but less reliable 20Mbit connection. Goal : use the reliable connection for smtp traffic (1Mbit) and http traffic (3Mbit), and route all other internet traffic over the other connection The techniques […]
Using OSPF on Juniper Netscreen Firewalls
Introduction to OSPF OSPF is a link-state (dynamic) routing protocol that operates within an autonomous system. OSPF falls within the group of Interior Gateway Protocols. Devices that use OSPF will advertise link state information. The devices generate Link State Advertisements (LSA’s) for directly connected links, and will forward LSAs received from other devices to ensure […]
Windows Live Writer unable to connect to WordPress Blog
Keywords : Invalid response document returned from XmlRpc server – System.Xml.XmlException: Unexpected end of file while parsing Name has occurred – After moving my old Sharepoint based blog to WordPress, I have encountered some problems when trying to connect Windows Live Writer to WordPress. When trying to connect Live Writer to my blog, I received […]
Free tool – PVE TCP Ping Utility – v1.0.0.1
I wanted to share a small utility that I wrote a while ago, allowing you to run a non-interactive ‘ping’ to a tcp port (e.g. from within a script). This could for example allow you to bring up a VPN tunnel from a script (by generating traffic to a target host), to determine whether a […]
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