The TI-84 Plus CE is approved for use on the following. Sequence graphing mode shows time series plot. Install Analysis Services in Power Pivot Mode. The steps include running. Patch management software is an. Create the right pre and post installation environment for successful patch operations with. Virtual work; Formulations.
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Facebook. Twitter2Ok guys, this is my first ever article. I rarely want to go to a debate on who is right or wrong an a particular deployment mode because I strongly believe that everyone has different use cases and they all are valid. But on this particular use case, I would like to share my experience with vwire. The main reason I put this together is because there is an article that is written a while ago ( 2012 to be exact ) which I believe is not accurate. A customer of mine asked me about this article a while ago and at that time, I did not really dig down into the technical details.
For some funny reason, this came up again recently and a colleague of mine asking about this particular issue that was outlined in the article.So let me start with vwire mode. From Palo Alto Networks official documentation, 'In a virtual wire deployment, you install a firewall transparently on a network segment by binding two firewall ports (interfaces) together. The virtual wire logically connects the two interfaces; hence, the virtual wire is internal to the firewall.' You can see from the description, virtual wire mode was designed to help us install the firewall transparently onto a network without the need to change broadcast or routing domain. When you have a packet coming into one of the vwire interface pair, then the same exact packet coming out from the other interface.
No changes to the L2 and L3 header. Hen the founders of Palo Alto Networks started the company, Vwire mode came on the idea of how can they proof the value of this new 'Next Generation Firewall' without the need of re-architecting L3 domain and delaying the process. When I joined Palo Alto Networks, vwire mode proven to be quite effective. At that time, not many people heard of Palo Alto Networks NGFW, and as you can imagine, every where we go, there is already a firewall/s installed on the network. To convince someone ( or even myself ) to rip out my routing domain and install another L3 device which then I have to uninstall in a couple of weeks is a massive risk to the business. Vwire provides a less risky deployment with the benefit of having the firewall inline to the traffic.
One can argue that Tap mode is the easiest and non-intrusive way of testing the firewall and I agree with that, but I won't go into Tap versus vwire discussion in this article. I havent seen many vwire deployment lately, but that is due to the fact that Palo Alto Networks now is the leader in the enterprise firewall space and is part of the L3 domain which negate the needs of using vwire mode. But that doesn't mean there is no longer use case for vwire mode.Now, let's go back to the testing that I've done.
Quite simple actually. Using the design of 'router on a stick', I have a router/firewall/L3 device, that sits on the north side of the L2 switch. The router connected to the switch via trunk link, inter-vlan routing is performed by the router. The switch is configured as a L2 switch only. There router has 2 sub-interfaces, each sub-interface acts as the default gateway for the particular vlan. On the south side, I have 2 hosts connected to the switch.
One host in vlan 200 and another in vlan 201. The hosts default gateway is the router's sub-interface.
I then run nginx in Docker on Host 201 to prove I can establish a full 3 way handshake from Host 200 to Host 201. I can successfully ping and browse from Host 200 to Host 201.My aim is now to 'insert' Palo Alto Networks NGFW into this network using vwire mode and achieve the same connectivity without changing any L3 domain.
I configure 2 interfaces to be the vwire interface pair, ethernet 1/3 and ethernet 1/4, then assign ethernet 1/3 to a vwire zone, called trust-vwire, and ethernet 1/4 to untrust-vwire zone. Next, is to configure the vwire configuration itself. Always remember when you insert the firewall into a trunk link, always assign the allowed vlans in the 'Tag Allowed' column, otherwise the firewall drops every vlan and only allow native vlan 0 by default.From Palo Alto Networks official documentation page. Tag Allowed, enter 0 to indicate untagged traffic (such as BPDUs and other Layer 2 control traffic) is allowed. The absence of a tag implies tag 0. Enter additional allowed tag integers or ranges of tags, separated by commas (default is 0; range is 0 to 4,094)'Do not miss this step!
I've seen so many misconfiguration on this and people go into the default mode 'blame the firewall'In short, the topology is as the per below diagram after the 'firewall insertion'. As I mentioned before, the firewall will see the packet twice in a reverse order and this is an expected behaviour.
So far, the testing is looking very good. I am wondering, is there any difference if I use an application that use a stateful protocol instead of stateless such as ICMP.
So I decided to use a simple web server to test TCP 3 hand shake.The flow is the same with the previous test. Generates an HTTP request from Host 200 to Host 201, and as expected, I was able to successfully access the web page with no issue, and this can be proves by quickly running 'show session all filter application web-browsing' on the CLI. As you can see from the tests that I performed, vwire is proven to be useful in an environment where you do not want or cannot change any L3 domain. There are some other useful vwire features and use cases that I won't discuss in this article, such as vwire sub-interfaces.
If time permitted, in my next article I am going to write a more complex use cases for vwire, but I do not see much vwire deployment requests lately, so I might put my time and effort that is more relevant in production such as BGP use cases, troubleshooting, log links feature with Dynamic Address Group ( Ben Burt's idea to publish an article on Log Links), etc.
Topics:.Oracle recommends you take the time to carefully plan your installation.Patch sets provide bug fixes only. A point release includes bug fixes and incorporates all current patch sets.Lists Oracle Application Express release and the schema name of each release.You can install Oracle Application Express or update from previous release using the same installation procedure and the installation scripts.You access the Oracle Application Express development environment, by signing in to a shared work area called a workspace.Signing into a workspace requires you first request a workspace and then sign into it. Oracle recommends you take the time to carefully plan your installation.The installation process involves the following steps:.Plan your installation: During the planning phase, you should determine whether to install a full development environment or runtime environment. A full development environment provides complete access to the App Builder development environment to develop applications. A runtime environment is an appropriate choice for production implementations in which you want to run applications that cannot be modified.You should also determine which Web listener to use. Available options include the Oracle REST Data Services, Embedded PL/SQL Gateway, or Oracle HTTP Server and modplsql.Verify installation requirements: the minimum requirements that your system must meet before you install the software.Install the software: The required installation steps depend upon which Web listener you decide to use.
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Patch sets provide bug fixes only. A point release includes bug fixes and incorporates all current patch sets.Patch sets are a mechanism for delivering fully tested and integrated product fixes. Patch sets provide bug fixes only. Patch sets typically do not include new functionality and they do not require certification on the target system.
Patch sets include all of the libraries that have been rebuilt to implement the bug fixes in the set. All of the fixes in the patch set have been tested and are certified to work with each other.In between major product releases, Oracle may offer a point release. A point release (for example Oracle Application Express release 5.0.3) includes bug fixes and incorporates all current patch sets. Typically, point releases do not introduce new functionality.
You can install Oracle Application Express or update from previous release using the same installation procedure and the installation scripts.The installation script checks for the latest existing Oracle Application Express schema and automatically copies the instance metadata, workspaces, and applications from the previous schema into the current schema. The original schema associated with the previous release is left completely unaltered. Following best practices, Oracle recommends that you create new tablespaces for a new release of Oracle Application Express and follow the appropriate installation instructions as outlined in this document. How you sign in and access Oracle Application Express depends upon your user role.A workspace enables multiple users to work within the same Oracle Application Express installation while keeping their objects, data, and applications private. Each workspace has a unique ID and name. An instance administrator can create a workspace manually within Oracle Application Express Administration Services or have users submit requests.
Oracle Application Express Administration Services is a separate application for managing an entire Oracle Application Express instance.Users are divided into four primary roles:.Instance administrators are superusers that manage an entire hosted instance using a separate application called Oracle Application Express Administration Services. Instance administrators manage workspace provisioning, configure features and instance settings, and manage security.Workspace administrators can perform administrator tasks specific to a workspace such as configuring workspace preferences, managing user accounts, monitoring workspace activity, and viewing log files.Developers are users who sign in to a workspace and create and edit applications.End users can only run existing database or Websheet applications.If you are a developer, an administrator must grant you access to shared work area called a workspace. If you are an Instance administrator, you must sign in to Oracle Application Express Administration Services, determine whether to specify a provisioning mode, create a workspace, and then sign in to that workspace. About Specifying a Provisioning ModeThe Instance administrator determines how the process of provisioning (or creating) a workspace works for a specific Oracle Application Express instance. To determine how provisioning works, an Instance Administrator selects one of the following options on the Instance Settings page:.Manual - In this mode, an Instance administrator creates new workspaces and notifies the Workspace administrator of the login icon.Request - Users request workspaces directly in a self-service fashion. Users click a link on the login page to access a request form.
After the workspace request has been granted, users are automatically emailed the appropriate login information.Request with Email Verification - In this mode, users request workspaces directly by clicking a link on the login page to access a request form. Each user receives an initial email containing a verification link. Clicking this link validates the user's email address and then the request is processed. Then another email is sent to the user containing login credentials (that is, the workspace name, username, and password).
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