Author Archives: rtoodtoo

About rtoodtoo

Genco has worked for more than 10 years either as a Network or Support Engineer. Currently lives in the Netherlands and works as a Technical Support Engineer at Juniper Networks.

Panorama address object mismatch with firewall

Panorama is a nice management tool. It is nice compared to NSM and Security Director:) On the other hand, I had to deal with an issue which is address group content on panorama was different than the firewall. Here is an example;

Panorama had AddGroup1 = Addr1 , Addr2, Addr3
Firewall had AddGroup1 = Addr1, Addr2, Addr3, Addr4

Security rule (Block_IPs) referencing AddGroup1 address group object had the action block but we needed to delete this Addr4. I don’t even want to think how this sync issue happened. The problem is that panorama pushed objects are read-only, you can’t delete them. What did I do?
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SSH client preference

There are various SSH clients for Windows platforms and up until couple of months ago I was thinking that the best SSH client for me was SecureCRT but I discovered another one called Mobaxterm. This product really took my attention, primary reason of which is the richness of the feature set. Fist look at what protocols it supports;

In my daily job,  I no longer have to use Filezilla and Rdesktop as it supports RDP and SFTP, The beauty of this is that each connection stays in its own tab so you only use one window for all connections.

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Slow file transfer and TCP Zero Window Probe

Slow file transfers must be really bothering everyone. I have a ZyXEL NSA325 NAS device which has a gigabit interface but I am getting extremely low throughput. Unfortunately this has been a problem I think since I bought this device. Now I could finally get hold of time to troubleshoot the issue. Here is my topology I used in testing this scenario.

nas-tcp-window-zero

As per the topology above, my laptop and this NAS device are connected to two ports of this Juniper EX2200 switch. I have enabled jumbo frame on the ports, laptop and NAS device.

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Palo Alto Networks #1: Initial Configuration (for beginners)

This post aims to give an introduction to configuring Palo Alto Networks firewall for initial deployment as it is for beginners, I would like to cover the following topics;

  • Configure management interface settings (i.e IP Address, default gateway) via console
  • Assign IP addresses to ethernet interfaces and default gateway
  • Configure NAT and Security Policies to allow Internet access to internal clients

For this purpose, we will be using the following simple topology;

palo-alto-networks-initial-configuration-for-beginners

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Differences between Juniper SRX and Palo Alto Networks firewalls

Once you are familiar with one firewall, sometimes it is difficult to be comfortable on another firewall. Here I will list 2 things that you do differently on these firewalls. At least these were the first things I noticed.

1) PING

On an SRX firewall, if you ping a remote address, command will be accepted.

However if you run the same command on a Palo Alto firewall, you get an invalid syntax.

However this isn’t really the difference I would like to tell. The correct syntax on Palo Alto is like this

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OSPF route withdraw

OSPF has slightly different way of removing routes compared to BGP. On this short post, I will present how a link failure is propagated to other routers on OSPF domain. For this test, I have the following topology section in which AREA3 is connected to AREA0 and we simulate a link failure on the Junos router J39 which has the subnet 10.37.24.0/24

ospf-route-removal-withdraw

Before the failure, we can see that 10.37.24.0/24 is contained in router LSA.

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BGP Route Refresh in JUNOS

What happens when you change a BGP import routing policy in your neighbor configuration? Changes take effect immediately or we need to issue the soft-inbound command to request the routes? Let’s see by an example.

We received the route 10.83.0.0/24 from 10.82.1.9 already as you see below.

Now I change the local preference from 2000 to 1999 in the import policy and commit the config.

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