Packet verification and retransmission mechanism: enhancing cross-border ERP access??? Solution//Glo

Packet verification and retransmission mechanism: enhancing cross-border ERP access??? Solution//Global IPLC service provider of Shigeng Communication

一、For multinational corporations, employees distributed across continents need to frequently access core ERP systems located at headquarters, such as SAP and Oracle E-commerce Suite. However, when data packets are transmitted across thousands of kilometers of public Internet, they will face problems such as network congestion, signal attenuation, equipment failure, etc., resulting in data packet damage or loss. The result is slow ERP operation response, failed data submission, and even session interruption, seriously affecting business efficiency.

To solve this pain point, simply increasing bandwidth is futile. The key is to implement a powerful packet verification and retransmission mechanism at the transport and application layers to safeguard every data exchange, ensuring business continuity and data integrity.

1. The cornerstone of TCP protocol: built-in reliable transmission guarantee

The TCP protocol itself is designed as a reliable transmission protocol, and its built-in checksum and retransmission mechanism is the foundation for all ERP access.

1. Packet checksum

Working principle: The sender calculates a checksum for each sent TCP packet, and the receiver recalculates the value. If the two do not match, it is concluded that the data packet has been damaged during transmission.

Value in ERP access: Ensuring binary accuracy of key data such as purchase order amounts, inventory quantities, and financial vouchers sent from the client to the server, preventing information confusion caused by data bit flipping.

2. Automatic retransmission request

Working Principle:

Confirmation and serial number: The receiving end must return a confirmation for each successfully received packet. The sender will start a retransmission timer for each packet.

Packet loss detection and recovery: If no confirmation is received before the timer expires, the sender will determine that the packet has been lost and automatically resend it.

The value in ERP access: When an important sales contract attachment or production material list is lost during transmission, the TCP layer automatically and transparently retransmits it without user perception or manual intervention, ensuring the ultimate success of the operation.

However, the traditional TCP retransmission mechanism has bottlenecks in high latency and high packet loss cross-border links: a packet loss requires waiting for hundreds of milliseconds to trigger retransmission, which seriously slows down the transmission speed of the entire connection.

2. Enhanced retransmission mechanism: optimization for cross-border links

To overcome the limitations of standard TCP, more advanced algorithms and optimizations need to be introduced.

1. Selective confirmation

Working principle: SACK allows the receiver to clearly inform the sender of which data segments have been lost, rather than just the expected next sequence number. This allows the sender to only retransmit packets that are truly lost, without the need to retransmit packets that have been successfully received afterwards.

Business impact: When transmitting an ERP report containing multiple line items, if only a small portion of data in the middle is lost, SACK can greatly reduce unnecessary data retransmission, improve bandwidth utilization, and accelerate the complete loading of the report.

2. Forward error correction

Working principle: FEC is an "active" error correction mechanism. It will send additional redundancy check packets calculated through algorithms while sending the original data packets. When the receiving end encounters a small amount of data packet loss, it can use these check packets to directly reconstruct the lost data without waiting for retransmission.

Business impact: For applications such as real-time dashboards or video training in ERP systems that are extremely sensitive to latency, FEC can minimize the lag caused by occasional packet loss and achieve a smoother experience. It uses a small amount of bandwidth overhead in exchange for significantly reduced latency and retransmission waiting.

3. Practical case: SAP access optimization of a manufacturing giant

Challenge: A Chinese manufacturer's employees in Europe experienced delays of several seconds when accessing the SAP S/4HANA system deployed in Shanghai, resulting in frequent "connection timeout" errors and a painful monthly account closing process.

Solution and Analysis:

Network path optimization: Firstly, enterprises have deployed SD-WAN solutions to intelligently select higher quality network paths, reducing packet loss rates from the root.

Protocol stack tuning: TCP SACK has been enabled and the retransmission timer algorithm has been optimized on SD-WAN devices and terminals to detect and respond to packet loss faster.

Application layer enhancement: For high traffic operations such as file transfer and printing, a data acceleration agent with forward error correction function has been deployed at the application layer. These agents will perform FEC encoding before data transmission and decode and recover at the receiving end.

Implementation effect:

The response time of SAP graphical user interface has increased from an average of 5 seconds to within 1.5 seconds.

The success rate of downloading large MRP reports has increased from 80% to 99.9%.

The overall time for monthly financial settlement has been reduced by 40%.

For any enterprise that relies on cross-border ERP operations, going beyond simple bandwidth upgrades and deeply understanding and optimizing these underlying transmission mechanisms when planning network architecture is the strategic key to building a stable and efficient global digital business network.

二、Shigeng Communication Global Office Network Products:

The global office network product of Shigeng Communication is a high-quality product developed by the company for Chinese and foreign enterprise customers to access the application data transmission internet of overseas enterprises by making full use of its own network coverage and network management advantages.

Features of Global Application Network Products for Multinational Enterprises:

1. Quickly access global Internet cloud platform resources

2. Stable and low latency global cloud based video conferencing

3. Convenient and fast use of Internet resource sharing cloud platform (OA/ERP/cloud storage and other applications

Product tariff: