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The abovementioned ICMP messages should be enabled in relevant network devices to allow the WSA to determine the MTU for its path through the network. IPv6 does not support fragmentation, and uses a Packet Too Big (Type 2) ICMPv6 message to indicate the inability to fit a packet through a given link.īecause the process of fragmenting packets can have severe impacts on the performance of a TCP flow, the WSA utilizes Path MTU Discovery. This continues until the MTU for the full path is discovered. The client then resends a smaller packet.

If, at some link along the path, a device cannot forward the packet without fragmenting it, an Internet Control Message Protocol (ICMP) Fragmentation Needed (Type 3, Code 4) message is sent back to the source. In the case of IPv4, a device can determine the Maximum Transmission Unit (MTU) of any packet along a path by setting the Don’t Fragment (DF) bit in the IP header of the packet. Path MTU Discovery, as defined in RFC 1191 ( ), is a mechanism for determining the maximum allowable size of a packet along an arbitrary path. It will also provide information useful in basic troubleshooting. That section will cover the monitoring of performance and availability, as well as system resource usage. The last section of this document will explain the most effective ways to monitor the appliance. There is also attention paid to specific features and how they should be configured to increase security, scalability, and efficacy. It will define complexity in this context and describe how to minimize it in policy design. This guide will address how the complexity of a configuration impacts system resources. The WSA policy configuration has implications not only for security efficacy and enforcement, but also for the performance of the appliance. This guide addresses the most common issues related to the surrounding network device configuration. It can also spoof client IP addresses, adding another layer of complexity to the deployment and imposing additional requirements on the supporting network configuration.

At a minimum, it employs server-side IP address spoofing and man-in-the-middle techniques to inspect HTTPS transactions. It is a both a source and destination of web traffic it acts at the same time as a web server and a web client. Each network will have its own specific requirements and challenges.Īs a security device, the WSA interacts with the network in several unique ways. While the best practices documented here are important for all administrators, architects, and operators to understand, they are only guidelines and should be treated as such. It addresses many aspects of a WSA deployment, including the supporting network environment, policy configuration, monitoring, and troubleshooting. This guide is intended as a reference for best practice configuration of the Cisco ® Web Security Appliance (WSA).

Import passwords from iron into firefox 2019