Docker is an opensource tool used for virtualization and deliver software in the form of packages called Containers. It is one of the most important tools used in networking domain. Dockerfile is a template for building the image which contains commands needed to package the software. In this post, I am going to explain the commands ADD & COPY used in Dockerfile . ADD Command: ADD command is used to copy files, directories or files from remote URLS to destination path in the image. The source paths can contain wildcards. If the destination has relative path, it is relative to the Working directory of the image. Note that source path is always relative to the Docker build context. ADD command will not support authentication. So, if there are any protected files to be added in Dockerfile building, use other tools like curl or wget Dockerfile copying Single & Multiple files, directory using ADD inst...
Introduction to ANDSF:
ANDSF full form is Access Network Discovery and Selection Function. It’s an entity in the Evolved Packet Core Network that helps in assisting User Equipment (UE) in the discovery or selection of access networks such as Wi-Fi, LTE etc. It follows the Client-Server architecture.
ANDSF client and ANDSF server communicate using Open Mobile Alliance Device Management protocol (OMA-DM) over the s14 interface. It uses a push and pulls mechanism for communication. The high-level interaction between the ANDSF server and UE looks like below:
Information exchanged by ANDSF Server:
ANDSF server provides the following category of information:
Access Network Discovery Information:
This information has the list of access networks like Wi-Fi that are in the range of the UE. In response to the UE request which contains information like location, supported interfaces, ANDSF provides the list of access networks available. Based on the response from the ANDSF server, the UE makes the decision to which network it should connect. The ANDSF response contains the following details:
- Type of technology like Wi-Fi, WiMAX
- Radio access network identifier like SSID of WLANs
- Technology information like one or more carrier frequencies
These access networks can be belonging to any network operator.
Inter-System Mobility Policy (ISMP):
This policy is valid for UE’s that have access to more than one active access network at the same time. For example, a device may support both LTE and Wi-Fi technologies but can connect to only one at a time. It consists of rules and policies used by UE’s to select the most preferable technology.
Inter-System Routing Policy (ISRP):
This policy is valid for UE’s that have access to more than one active access network and also which can route IP traffic concurrently over multiple radio access interfaces. UE uses this policy information to select the most preferable access network to direct the given traffic. This information can also be used by UE using protocols like DSMIPv6 (Dual Stack Mobile IPv6).
It also has validity conditions like location area condition, time of the day condition etc. Based on UE’s location, it can be connected to Home ANDSF (H-ANDSF) and Visitors ANDSF (V-ANDSF).
Well explained!
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