This causes the application to wait before it gives up and tries another strategy, and it also saves firewall resources. The safest and most efficient option is to Drop requests. For DNS requests not allowed by the DNS proxy policy, you can configure the proxy to Drop or Deny the requests, or Block the source of requests. The first packets sent by the evasive application are often DNS UDP packets on port 53. This section describes the configuration based on the chronological order of packets we expect to see from evasive applications such as Ultrasurf. The Firebox interfaces in this example have these IP addresses:
![hack router port 53 udp hack router port 53 udp](https://www.howtogeek.com/wp-content/uploads/2016/11/img_581b5269602a7.png)
All network clients must use the Firebox as their default gateway. This example configuration uses a basic network topology, to show how the Firebox can filter all traffic between the clients on the trusted network and the public internet.
![hack router port 53 udp hack router port 53 udp](https://setuprouter.com/router/pci/blw-54mf/port-forwarding-6299-large.jpg)
The WebBlocker configuration is used by the HTTP-proxy and HTTPS-proxy actions.
HACK ROUTER PORT 53 UDP DOWNLOAD
Another strategy includes attempts to download another executable while the application continues to repeatedly try to connect to a server. If all of this fails, the application could try to connect to backup servers located on popular and often allowed data centers such as Microsoft or Amazon Web Services. Some applications try to build an SSL tunnel on either the standard port 443, or another port, such as TCP 53 or another dynamically selected port. Then it tries to connect to the server on HTTP port 80 and then on HTTPS port 443. Typically, the application first sends DNS queries to try to find a server.
![hack router port 53 udp hack router port 53 udp](https://blog-cloudflare-com-assets.storage.googleapis.com/2020/09/raking-sandbox@2x.png)
Many proxy avoidance applications use a similar set of strategies to try to connect to their servers.
HACK ROUTER PORT 53 UDP WINDOWS 7
This example configuration was tested with a Windows 7 network client protected by a Firebox installed with Fireware v11.12.2.
![hack router port 53 udp hack router port 53 udp](https://files.speakerdeck.com/presentations/2622fe10c047013091cd6aa47b581d8f/slide_9.jpg)
This configuration example also includes some of the log messages that indicate the actions of the configured policies and services.
HACK ROUTER PORT 53 UDP HOW TO
This configuration relies primarily on Application Control and WebBlocker, but also describes how to correctly configure outbound DNS, HTTP, HTTPS and TCP-UDP policies. Your network environment might require additional configuration settings. This configuration example is provided as a basic guide. You could use a similar strategy to block other types of evasive applications on your network. This example focuses on how to prevent the use of one proxy application, Ultrasurf, which is a good example of an evasive application. This example demonstrates how to use policies and WatchGuard security services to effectively block evasive applications. Configuration files created with - Policy Manager v11.12.2Ĭonfiguration files created for - Fireware v11.12.2