single VCC IP address to the public network. The principle of Network Address Port Translation is presented in Figure 15.

Home network (LAN)

 

 

 

Internet (WAN)

src:192.168.1.112:1228

192.168.1.254

 

195.112.12.161

src:195.112.12.161:50001

dst:194.112.11.111:80

NAPT router

dst:194.112.11.111:80

 

 

src:194.112.11.111:80

 

src:194.112.11.111:80

dst:192.168.1.112:1228

 

dst:195.112.12.161:50001

 

 

 

Figure 15 Principle of Network Address Port Translation

NAPT may restrict the operation of some IP applications. NAPT also operates as a simple IP firewall because translation is only allowed when the first packet is transmitted from the LAN. This means that the NAPT table entry is created only when a packet is sent from the home network to the Internet. With server support capability, the user can add static entries to the NAPT table allowing the translation always in both directions. This capability is used to add servers (HTTP, NNTP, and FTP), which are visible to the public IP network via the VCC, on the LAN subnet.

NAPT supports most IP-based protocols. Because NAPT operates on the IP and transport layer, the application that includes IP address and port within the payload will not work properly through NAPT. In many cases, these applications can be passed through the NAPT using Application Layer Gateway functionality (ALG). M1122 has ALG for the following protocols/applications:

DICMP

DFTP

DH.323 including NetMeeting

DCUSeeMe

DPPTP

DIRC

DIPSEC ESP tunnel mode and IKE

Note, that most IPSEC implementations will fail when passed through NAPT. A typical reason is that the identification may fail if the identification is based on IP address. Also, only tunnel mode without Authentication Header (AH) works.

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M1122, T66280 specifications

The Nokia T66280 and M1122 are notable entries in the telecommunications landscape, showcasing Nokia's commitment to innovation and quality in mobile technology. Though they may not be as widely recognized as some of Nokia's flagship models, these devices represent a blend of functionality and design geared towards various user needs.

The Nokia T66280 is designed as a reliable communication tool, featuring a robust build that withstands the rigors of daily use. One of its main features includes a full QWERTY keypad, facilitating easy text input, which appeals to users who engage in frequent messaging. The device supports a variety of network bands, ensuring connectivity across multiple regions. Its compact design paired with a sturdy casing makes it an excellent choice for users requiring durability without sacrificing style.

Equipped with up to 2GB of internal memory, the T66280 allows for ample storage of contacts, messages, and essential applications. The phone also benefits from Nokia’s renowned battery life, enabling users to stay connected longer without constant recharging. An important technology featured in this device is the integration of a reliable operating system, enhancing usability and supporting additional applications that meet the user's needs.

On the other hand, the Nokia M1122 takes a slightly different approach, focusing on a streamlined and user-friendly experience. This device emphasizes simplicity, making it an ideal choice for individuals who prioritize straightforward functionality over excessive features. Its interface is intuitive, with easily navigable menus and a clear display, ensuring that users can quickly access their desired functions.

With features such as Bluetooth connectivity, the M1122 allows users to effortlessly connect to other devices for data transfer or hands-free communication. The device also boasts impressive call quality, which is a hallmark of Nokia's engineering expertise. The M1122 is crafted to support long-lasting performance, equipped with a sizable battery that extends its operational time.

In conclusion, both the Nokia T66280 and M1122 embody Nokia's dedication to delivering accessible, reliable, and effective mobile communication solutions. With their distinct features, technologies, and characteristics, these models cater to a wide range of users, reinforcing Nokia's legacy in the mobile phone industry. Whether prioritizing functionality or simplicity, users can find value in these devices, enjoying the quality and support that comes with the Nokia brand.