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Network Services

Meraki device changes to Repeater Mode

When adding a second, or additional Meraki device onto an existing network; or in the case of an already configured multiple-device wireless network, you may noticed that one of the device operates or switches into “Repeater Mode”.

If you are used to configuring multiple access points as gateways (preferred method), you may not immediately identify that one of the devices has changed into operating as a Repeater.

If you have not intestinally configured the device in this manner, and prepared the site for this kind of setup, you may find the device in repeater mode has trouble with connectivity, and drops users off the network, especially when there is a high amount of users / traffic. This will especially be evident if the devices do not have a strong signal between each other, often not such a major issue when the access points are both setup as gateways. Pushing all the traffic from one device, to another access point over wireless is obviously not an ideal scenario if Ethernet cable access is available.

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Windows Server 2012 R2 Asynchronous Credits

We recently came across an issue with several new Windows 2012 R2 boxes in a particularly organisation having mysterious file save errors and mapped drive disconnects.

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What’s new in Windows Server 2016

 

With Windows Server 2016 set for release this year, we take a look at some of the exciting features that have been included in technical previews so far.

Nano Server

Possibly the most interesting feature is the introduction of Nano Server. Nano Server is a purpose built operating system, scaled down to act as a platform of containers (more information below). Reducing the server footprint, Nano Server will require fewer patches and updates, improved resource utilization, less OS components and features as well as tightened security.

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Configure Default Computers and User OU’s in Active Directory

 

By default, machines joined to a new domain are added to the Computers OU. For any managed network, it is important to ensure machines are placed in a production OU as soon as they are joined to the domain, to ensure the correct polices are applied and applications are deployed.

You can automate this administrative step so newly machines added to the domain will be placed a pre-determined OU, negating the need for an administrator to go into the server to make the change.

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Windows Provisioning and BYOD

What is it?

Provisioning packages can be created and deployed to windows 10 devices by using Windows Imaging and Configuration Designer (IDC). IDC creates provisioning packages which can be deployed to Windows 10 devices, including home devices which are not added to a domain. It allows quick configuration of a device without having to re-image. A provisioning packages is a set of rules that can be applied to both domain and non-domain (home) workstations / laptops and home devices, opening the door for a simplified approach to the complexities of managing a BYOD solution in the enterprise.

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How to implement basic Class of Service on a Juniper SRX

Lets say you have a network with VoIP handsets internally and a SIP proxy externally. You will want to make sure the SIP traffic gets better treatment at the firewall, particularly if the internet and VoIP traffic is running over the same WAN link. So how do you implement this in JUNOS?

The steps in a nut shell are:
– setup the class-of-service schedulers and
– then map the schedulers to the forwarding class
– then apply the firewall rules to move the packets into the forwarding class
– Then apply the firewall filter to the interface

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Is your internet link performing badly?

Is your internet link performing badly?      Have you checked duplex settings on the WAN interface?

Recently when looking at a customers network i noticed that their internet WAN interface was in half duplex mode.  This is a common misconfiguration and results in poor performing internet links.

On a Juniper SRX you can see the interface statistics, including the duplex information by issuing the below command

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What is a PTR record and how do you add one?

A PTR record is almost the exact opposite of an A record.  An A record resolves a hostname, for example, mail.contoso.net, into an IP address, such as 192.168.1.123.  Conversely, a PTR record resolves an IP address back into a hostname.

PTR records are mostly used to determine if a mail server is really associated with the IP address where the connection was initiated from.  This is akin to receiving a package with a return address that says it is from Perth, but the actual postmark on the box said it came from Singapore.  Many spammers spoof (fake) the address from where the email is coming from in order to bypass anti-spam measures. Click Here To Read More

Setting up IDP on the Juniper SRX

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Juniper

 

Intrusion Detection Prevention (IDP); or sometimes known as IPS, is a feature of the Juniper SRX range. IDP is available on the branch SRX’s all the way through to the datacentre versions and is a fantastic item under the IT Services feature set. IDP is particularly useful as another layer of security to inspect data transmissions between client and server and perform an actions upon it, a good example is IDP’s ability to detect known Shell code buffer overflow exploits that are out there in the wild and stop them in their tracks AND also block that IP for set period of time, like 1 hour, 1 day or a week! These buffer overflow style attacks are typically launched at a server once traditional enumeration steps have been performed by the remote attacker. To thwart the enumeration attacks juniper makes use of SCREENS, but that is a discussion for another time.

so how do we configure an SRX for IDP?

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