Understanding Firewall Filters

When you start firewall service, the default configuration denies access to all incoming packets from remote computers except ports for remote configuration. This provides a high level of security. You can then add new IP filters to allow server access to those clients who require access to services.

To learn how IP filters work, read the following section. To learn how to create IP filters, see “Managing Firewall Service” on page 49.

What is a Filter?

A filter is made up of an IP address and a subnet mask, and sometimes a port number and access type. The IP address and the subnet mask together determine the range of IP addresses to which the filter applies, and can be set to apply to all addresses.

IP Address

IP addresses consist of four segments with values between 0 and 255 (the range of an 8 bit number), separated by dots (for example, 192.168.12.12). The segments in IP addresses go from general to specific (for example, the first segment might belong to all the computers in a whole company, and the last segment might belong to a specific computer on one floor of a building).

Subnet Mask

A subnet mask indicates which segments in the specified IP address can vary on a given network and by how much. The subnet mask is given in Classless Inter Domain Routing (CIDR) notation. It consists of the IP address followed by a slash (/) and a number from 1 to 32, called the IP prefix. An IP prefix identifies the number of significant bits used to identify a network.

For example, 192.168.2.1 /16 means the first 16 bits (the first two numbers separated by periods) are used to represent the network (every machine on the network begins with 192.168) and the remaining 16 bits (the last two numbers separated by periods) are used to identify hosts (each machine has a unique set of trailing numbers).

Chapter 3 IP Firewall Service

45

Page 44 Page 46
Page 45
Image 45
Apple 034-2351_Cvr manual Understanding Firewall Filters, What is a Filter?, IP Address, Subnet Mask
Page 44 Page 46

034-2351_Cvr specifications

The Apple 034-2351_Cvr is a remarkable product designed to enhance the user experience for various Apple devices. Known primarily as a protective cover, the 034-2351_Cvr is tailored to meet the demands of both functionality and style.

One of the main features of the 034-2351_Cvr is its premium materials that provide durability while maintaining a lightweight profile. Made from high-quality polycarbonate and soft-touch silicone, the cover not only protects devices from scratches and minor drops but also offers a comfortable grip. The edges of the cover are reinforced to absorb shocks, ensuring your device remains secure under everyday use.

Another defining characteristic is the precise cutouts and tailored design that allows for seamless access to all ports and buttons. Users can easily charge their devices, utilize speakers, and access buttons without needing to remove the cover. This focus on user accessibility aligns perfectly with Apple’s ethos of simplicity and ease of use.

In terms of technology, the 034-2351_Cvr features advanced features that cater to modern-day needs. It provides compatibility with wireless charging, ensuring that users can charge their devices without the hassle of removing the cover. This convenience is especially valuable for users who travel frequently and rely on wireless charging solutions.

Additionally, this cover incorporates antimicrobial properties, helping to reduce the growth of bacteria on its surface. This is increasingly important for users who are aware of hygiene, especially during a time when sanitization has become a priority in everyday life.

Design-wise, the 034-2351_Cvr is available in a range of colors and finishes, allowing users to personalize their devices according to their style. Whether one prefers a sleek matte look or a vibrant glossy finish, there is an option to suit every aesthetic.

Furthermore, the cover is designed to fit securely without adding bulk, preserving the slim profile of the device it protects. This maintains the sleek Apple design language while offering essential protection.

In conclusion, the Apple 034-2351_Cvr is more than just a protective accessory. With its combination of high-quality materials, advanced technologies, and stylish design, it embodies the essence of modern device protection, making it an essential accessory for Apple device users.
Top Page Image Contents