Cisco Systems OL-12172-01 manual DMZ User Attempts to Access an Inside Host, 15-6

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Chapter 15 Firewall Mode Overview

Routed Mode Overview

The following steps describe how data moves through the security appliance (see Figure 15-4):

1.A user on the outside network attempts to reach an inside host (assuming the host has a routable IP address).

If the inside network uses private addresses, no outside user can reach the inside network without NAT. The outside user might attempt to reach an inside user by using an existing NAT session.

2.The security appliance receives the packet and because it is a new session, the security appliance verifies if the packet is allowed according to the security policy (access lists, filters, AAA).

3.The packet is denied, and the security appliance drops the packet and logs the connection attempt.

If the outside user is attempting to attack the inside network, the security appliance employs many technologies to determine if a packet is valid for an already established session.

A DMZ User Attempts to Access an Inside Host

Figure 15-5shows a user in the DMZ attempting to access the inside network.

Figure 15-5

DMZ to Inside

Outside

209.165.201.2

10.1.2.110.1.1.1

Inside

DMZ

 

92402

User

Web Server

10.1.2.27

10.1.1.3

The following steps describe how data moves through the security appliance (see Figure 15-5):

1.A user on the DMZ network attempts to reach an inside host. Because the DMZ does not have to route the traffic on the Internet, the private addressing scheme does not prevent routing.

2.The security appliance receives the packet and because it is a new session, the security appliance verifies if the packet is allowed according to the security policy (access lists, filters, AAA).

3.The packet is denied, and the security appliance drops the packet and logs the connection attempt.

 

Cisco Security Appliance Command Line Configuration Guide

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OL-12172-01

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Contents IP Routing Support 15-1An Inside User Visits a Web Server 15-2An Outside User Visits a Web Server on the DMZ 15-3An Inside User Visits a Web Server on the DMZ 15-4An Outside User Attempts to Access an Inside Host 15-5DMZ User Attempts to Access an Inside Host 15-6Allowed MAC Addresses Transparent Firewall NetworkAllowing Layer 3 Traffic 15-7Passing Traffic Not Allowed in Routed Mode MAC Address vs. Route Lookups15-8 Using the Transparent Firewall in Your Network Transparent Firewall Guidelines15-9 Unsupported Features in Transparent Mode 15-10How Data Moves Through the Transparent Firewall 15-118shows an inside user accessing an outside web server 15-12An Inside User Visits a Web Server Using NAT 15-13An Outside User Visits a Web Server on the Inside Network 15-1415-15 11 Outside to Inside15-16

OL-12172-01 specifications

Cisco Systems OL-12172-01 is a pivotal component in the landscape of networking and telecommunications, particularly catering to the needs of businesses seeking robust and efficient networking solutions. This particular offering is part of Cisco's ongoing commitment to providing advanced networking technologies that enhance connectivity, security, and overall operational efficiency.

One of the main features of Cisco OL-12172-01 is its capability to support enterprise networking environments through highly scalable and flexible architecture. The device is designed to address the growing demands for bandwidth and connectivity in corporate networks, enabling seamless communication and data exchange among various devices and applications. With support for high-speed Ethernet connections, the OL-12172-01 can significantly improve the performance of network operations, ensuring minimal downtime and optimal user experiences.

Security is a hallmark of the Cisco OL-12172-01. The device comes equipped with advanced security protocols that protect sensitive data and mitigate the risks associated with network vulnerabilities. Features such as integrated firewall capabilities, Virtual Private Network (VPN) support, and intrusion prevention systems are vital in safeguarding corporate information against cyber threats. This ensures that businesses can operate confidently in a digital landscape laden with potential risks.

Another significant aspect of the OL-12172-01 is its compatibility with various Cisco technologies, enhancing its versatility. It integrates seamlessly with Cisco’s Software-Defined Networking (SDN) solutions, allowing for dynamic network management and automation. This adaptability means businesses can respond quickly to changing network demands and efficiently manage resources without incurring excessive costs.

The OL-12172-01 also boasts comprehensive management and monitoring tools. Through Cisco's management software, network administrators can easily configure, monitor, and troubleshoot their networks. These tools provide insight into network performance metrics, enabling proactive measures to ensure optimal functionality.

In summary, Cisco Systems OL-12172-01 is a feature-rich device designed for modern enterprise networking. With advanced security measures, high-speed connectivity, and compatibility with cutting-edge technologies, it empowers businesses to optimize their network infrastructure while maintaining high levels of protection. As organizations continue to evolve their IT landscapes, the OL-12172-01 remains a reliable solution for enhancing operational efficiency and safeguarding essential data.
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