Cisco Systems OL-12172-01 manual 15-15, Outside to Inside

Page 15

Chapter 15 Firewall Mode Overview

Transparent Mode Overview

If the destination MAC address is not in the security appliance table, the security appliance attempts to discover the MAC address by sending an ARP request and a ping. The first packet is dropped.

5.The web server responds to the request; because the session is already established, the packet bypasses the many lookups associated with a new connection.

6.The security appliance forwards the packet to the outside user.

An Outside User Attempts to Access an Inside Host

Figure 15-11shows an outside user attempting to access a host on the inside network.

Figure 15-11 Outside to Inside

Host

Internet

209.165.201.2

Management IP 209.165.201.6

92410

Host

209.165.201.3

The following steps describe how data moves through the security appliance (see Figure 15-11):

1.A user on the outside network attempts to reach an inside host.

2.The security appliance receives the packet and adds the source MAC address to the MAC address table, if required. Because it is a new session, it verifies if the packet is allowed according to the terms of the security policy (access lists, filters, AAA).

For multiple context mode, the security appliance first classifies the packet according to a unique interface.

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

4.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.

 

 

Cisco Security Appliance Command Line Configuration Guide

 

 

 

 

 

 

OL-12172-01

 

 

15-15

 

 

 

 

 

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Contents 15-1 IP Routing Support15-2 An Inside User Visits a Web Server15-3 An Outside User Visits a Web Server on the DMZ15-4 An Inside User Visits a Web Server on the DMZ15-5 An Outside User Attempts to Access an Inside Host15-6 DMZ User Attempts to Access an Inside Host15-7 Transparent Firewall NetworkAllowing Layer 3 Traffic Allowed MAC AddressesPassing Traffic Not Allowed in Routed Mode MAC Address vs. Route Lookups15-8 Using the Transparent Firewall in Your Network Transparent Firewall Guidelines15-9 15-10 Unsupported Features in Transparent Mode15-11 How Data Moves Through the Transparent Firewall15-12 8shows an inside user accessing an outside web server15-13 An Inside User Visits a Web Server Using NAT15-14 An Outside User Visits a Web Server on the Inside Network11 Outside to Inside 15-1515-16

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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