When you try to move more than 100 GB between two computers over a local network and you see that Windows 11 gets stuck... 14 MB/s on a gigabit LANThe feeling is that something is seriously wrong. Especially if your Starlink internet connection drops to 150-200 MB/s, yet your local network, which should be much faster, seems to be sluggishly slow.
To achieve really fast and stable bulk LAN transfers Simply copying and pasting files isn't enough. This is where the type of network (point-to-point, multipoint, LAN-to-LAN between locations), the hardware of the computers, the advanced configuration of the network card, and, of course, the software tools you use—both for copying data and for communicating within the organization—all come into play.
What are bulk LAN transfers and why do they matter?
When we talk about bulk transfers on a LAN, we are referring to sending very large files or large volumes of data between devices connected to the same local network or between interconnected LANs (LAN to LAN). Moving a few photos is not the same as synchronizing databases, virtual machines, or backups of hundreds of gigabytes.
In a modern LAN, bulk transfers must be fast, safe and reliableThis means that the network must have sufficient bandwidth (for example, 1 Gbps or 10 Gbps), low latency, and a suitable configuration so that the system does not crash when sending large files.
In many cases, these transfers are not done manually, but through LAN messaging solutions, synchronization tools, or payment and data distribution systems that automate processes between different teams or locations. All of this travels over the local network or dedicated LAN-to-LAN links, without using the public internet.
The key is to understand that a file transfer is not just "sending a file", but a multi-stage process:
- Authentication.
- Preparation.
- Shipping via the network.
- Error control.
- Reconstruction.
- Verification.
Any bottleneck in one of these stages can cause your effective speed to plummet well below what the cable allows.
How a LAN-to-LAN network works and its impact on data transfers
A LAN to LAN network is, in essence, a data transmission service IP-based point-to-point It links two or more local networks through a private link. From the equipment's point of view, it's as if all the offices were on the same physical network, even if they are separated by hundreds of kilometers.
Instead of routing traffic over the Internet, a LAN-to-LAN connection uses dedicated links (often fiber optic) With guaranteed bandwidth and low latency, when you share a huge file from your main office to a branch, the data travels through a closed infrastructure, without mixing with public traffic or suffering from external congestion.
The link acts as an "Ethernet tunnel" between sites: IP packets can travel without fragmentation below a few 1500 bytes of standard MTUor even using jumbo frames if all the machines in the chain support it. This reduces header overhead and improves overall performance on very large transfers.
This type of network relies on technologies such as Ethernet and symmetrical fiber opticThis ensures consistent speeds—from 1 Mbps in basic scenarios to 10 Gbps in more demanding environments—and very low latencies for critical applications such as VoIP, videoconferencing, or ERP systems.
Network architectures: point-to-point, multipoint, and mesh
The way different locations are connected determines how your large data transfers will travel across the LAN. Broadly speaking, three main architectures are used with topologies adapted to the company structure:
- Scheme point by pointThere are only two locations directly connected to each other. This is the simplest option and ideal when you need a dedicated and highly secure connection between two sites, for example, a main office and a data center.
- Córdoba point-multipoint. PA central location that connects to several branches. This is very common in businesses that have a "main" office and many branches, as it simplifies the management of shared resources and security policies.
- Grid architecture. It interconnects all sites or, at least, generates multiple alternative paths. This improves redundancy and fault tolerance: if one link fails, massive transfers can be redirected via another route to avoid disrupting operations.
These architectures can be combined with wireless solutions (LAN to LAN wireless) when cabling is not feasible. However, this enters a territory where environmental conditions, interference, and QoS capability They can limit performance compared to wired links.
Deep file transfer: from source to destination
Beyond the topology, a massive file transfer over a LAN always follows a fairly well-defined series of steps, whether you use a simple Copy and paste in Windows such as using FTP, SFTP, HTTP or internal applications:
It all starts with a shipping requestThis data can originate from a transfer client, a browser, an automated process, or enterprise software (for example, an ERP replicating data between sites). Before anything is moved, systems typically require authentication to prevent unauthorized access.
Once the user or service is authenticated, the system prepares the file. compress it, encrypt it, or break it into small packets to make the transmission more efficient and robust against errors. This phase may also include negotiation of the protocol to be used (classic FTP, secure SFTP, HTTP/HTTPS, etc.).
During transmission, the information passes through the various network equipment of the LAN (switches, routers, firewalls) following the rules of the chosen protocol, which defines how the data is formatted, what headers are added, and how acknowledgments are handledThis is where the quality of the local infrastructure comes into critical play.
Error checking mechanisms, both in the protocol and in the network card itself, detect whether there are damaged or lost packets. In that case, the receiver requests timely broadcasts to maintain integrity, instead of starting over from scratch, something vital in giant archives.
When the data stream reaches its destination, the system reconstructs the file if it has been fragmented, saves it to the appropriate storage, and performs additional checks. compare file sizes even using checksums or cryptographic hashes to confirm that the content exactly matches the original.
Modern solutions typically accompany this entire cycle of functions such as task automation, detailed activity logs, and integration with business systemsso that moving large volumes of information is not a manual and error-prone task, but a routine and auditable process.
Network card parameters that affect bulk transfers
One of the things that are often forgotten when people complain that their LAN is "slow" are the advanced NIC (network card) settingsEspecially in Windows 11, many of these options come pre-configured for general use, not necessarily optimal for large-scale transfers. These are the most important:
- Advanced EEE (Energy Efficient Ethernet)It prioritizes energy saving over performance. In networks where it's crucial to squeeze every megabyte per second, it's generally recommended to disable these low-power options to prevent the card from entering states that penalize speed.
- Checksum offloading for TCP and UDP in IPv4 and IPv6. These functions allow the NIC to calculate checksums in hardware, reducing the CPU load, but sometimes trigger incompatibilities or crashes with certain programs.
- Flexible Payment Large Send Offload (LSO) for IPv4 and IPv6. This technology allows the network card to break large blocks of TCP data into smaller packets.
- RSS (Receive Side Scaling). It distributes the work of processing packets across multiple CPU cores, balancing the load on multi-core systems and improving the management of intensive data flows.
- Receive and transmit buffersThe larger the receive buffer size (for example, 512 instead of lower values), the more headroom there is to absorb heavy bursts without packet loss. On cards that allow it, it's generally recommended to set these values ​​to the maximum reasonable amount.
- Jumbo Frames. They expand the transmission unit beyond the standard 1500 bytes, going to 2 KB, 3 KB, 4 KB or even more, depending on the hardware.
Finally, options such as flow controlInterruption moderation, duplex mode, and fixed speed (1000 Mbps full duplex vs. auto) can make the difference between a high-quality network and one that suffers from outages or speed drops. In some scenarios, Flow Control is disabled to prevent blocking, and stable link parameters are enforced.
Main messaging and transfer solutions in LAN networks
There are numerous applications designed specifically for messaging, collaboration, and file transfer on local networksSome are geared towards large corporations, while others are aimed at small offices or home networks. Let's review the most prominent ones from the analyzed content.
TrueConf
TrueConf It's a corporate messenger deployed on the company's servers that offers a comprehensive communication solution: chat, 4K video calls, screen sharing, and collaboration tools. Because it's hosted internally, All traffic and data remain within the corporate networkWith support for integration with PBX, Active Directory and conferencing with up to 1500 users.
This platform allows you to synchronize your call and chat history across all authorized devices, create personal and group chatsIt integrates conference rooms and video conferencing terminals and manages the system with real-time monitoring. It's a solution designed for companies that prioritize total control and security, with multiple levels of protection.
Softros LAN Messenger
It focuses on providing simple and reliable chat over LAN, WAN, VLAN, and VPN networks. It requires no internet connection or additional servers. It encrypts data with End-to-end AES-256 This applies to both individual and group conversations. It includes mass messaging, contact grouping, message history, presence status, and even remote desktop control.
Among its strengths, its ability to automatically detect users connected to the networkIt supports over 100 users, integrates with Active Directory, and allows importing and exporting configurations. It's a very convenient option for organizations that want something similar to older messaging clients, but limited to the internal network and without relying on external services.
Lancet Chat
An even lighter tool. It is geared towards text messaging, file sharing, and screen sharing On local networks, it supports over 100 connected users. It operates in P2P conference mode, requiring no administrator. It allows private messaging, sound notifications, and pop-up windows when new users join, as well as keyboard shortcuts for quick chat management.
The main drawback is the lack of adequate translation of the interface into certain languages ​​and the need for all devices are on the same subnet and behind the same NAT schemeThis makes it more suitable for small, well-defined networks.
Bee BEEP
It aims to be a free and open-source LAN messenger, ideal for Small offices and home networksIt allows you to send messages, files, and screenshots, features message encryption, and a multilingual interface. It doesn't require a central server: each client communicates directly with the others, minimizing deployment complexity.
Its functions include: group chats, configurable notifications, and the ability to send messages to users who are offlineso they receive them when they reconnect. It's available for Windows, macOS, and Linux.
KouChat
Also free and open source. It offers a similar experience focused on decentralized communication: each user acts as a nodeThis eliminates the need for a dedicated server. It supports group chats, file sharing, emojis, font and theme customization, end-to-end encryption, and offline messaging.
Furthermore, its cross-platform compatibility (Windows, macOS, Linux, Android) makes it very versatile. The ability to perform audio and video calls within the local network This makes it an interesting tool for companies that want to keep their internal communications absolutely under control.
Mychat
A client-server messenger designed for corporate networks, with integration with Active Directory, multi-level contact lists, and a complete system of permissions and mass notificationsIt supports conferencing, traffic encryption via OpenSSL, and guarantees message delivery even if the recipient is offline at the time of sending.
It includes powerful extras such as a Integrated FTP server for documents and filesIt includes a web version for mobile phones and tablets, remote control of devices with UltraVNC or Radmin, and audio and video calls via WebRTC. Furthermore, it offers integrations with other systems (phpBB, Delphi, C#, Python), facilitating rapid integration into existing workflows.
Squiggle
Squiggle closes the group as a free and portable (no installation required) LAN messenger for Windows, offering text chat, file transfer, and screenshotIt uses AES-256 encryption and SSL to protect data, supports group chats and broadcast messages, as well as remote desktop control and multilingual support.
Its biggest advantage is that it can be used in different LAN configurations. Including VPNs and subnets, without having to set up a complex server, making it perfect for environments that need something fast, secure and without too much administration.
Payment dispersion and automation of financial flows in LAN
Massive LAN transfers don't just affect files and messaging; they also have a significant financial impact. The so-called payment disbursement It is a service that allows you to send funds to many bank accounts simultaneously and automatically, something critical for companies that need to make returns, refunds, payments to suppliers or collaborators on a recurring basis.
Platforms like Floid connect to the APIs of the major banks so that the business can integrate that dispersion directly into its systems. From a technical point of view, this involves generating and transmitting large volumes of structured financial data, which must travel securely and reliably, often relying on internal LAN networks and LAN-to-LAN links towards data centers or bank headquarters.
By automating these processes, companies minimize manual tasks. In other words, They prevent human error and reduce unnecessary delays.This directly impacts operational efficiency and customer and supplier satisfaction. Again, the reliability and security of the LAN infrastructure are essential for these processes to run smoothly.
Security, segmentation, and control in LAN-to-LAN networks
In a context where cyberattacks have shifted from public bodies towards companies of all sizesThe role of the local network as a security perimeter has become fundamental. A well-designed LAN-to-LAN creates an environment isolated from the internet where information circulates privately.
By interconnecting sites via dedicated links, the company can apply IP addressing policies and network segmentation To limit the scope of each potential incident, dividing the network into smaller segments reduces the attack surface.
This approach relies on the advanced configuration of QoS (quality of service) This prioritizes critical applications (ERP, VoIP, videoconferencing) while ensuring that massive data transfers don't block other services. Centralized IT control allows for monitoring, configuring, and strengthening the security of all network devices from a single point.
In sectors such as banking, the technology industry, or government agencies, the demands are extremely high: they need that each device remains inaccessible from open networksthat personal data is not processed in opaque third-party environments and that any internal communication is subject to its own rules and audits.
Ultimately, this entire ecosystem—from properly configured network cards in Windows 11 to LAN-to-LAN architectures, corporate chats, and payment distribution systems—converges on a common goal: enabling your organization to move large volumes of information and money quickly, securely, and under your own controlWhen every piece is properly adjusted, massive LAN transfers cease to be a bottleneck. On the contrary: they become a clear competitive advantage.