# CloudLink intro

CloudLink is a managed service for Bondix S.A.NE servers. It is available globally and fully
managed and operated by Unwired Networks.

CloudLink with Bondix S.A.NE allows seamlessly aggregated connections across multiple network
uplinks like ethernet, multiple modems, satellite, DSL or cable. Connections share bandwidth of
all links and are optimized to utilize the link with the lowest latency first. All links will be
used simultaneously if necessary to deliver the bandwidth and failover will happen completely
seamlessly for both TCP and UDP workloads within milliseconds.

For any additional information about CloudLink, regional availability or technical consulting
please contact [sales@unwirednetworks.com](mailto:sales@unwirednetworks.com).

## Features

List of CloudLink features:
- Uplink priority between different uplinks
- Will seamlessly failover, bandwidth share and generally aggregate any traffic (including TCP,
  UDP, ICMP) on a packet level
  - does not interrupt existing TCP connections
  - reaction time for bandwidth and latency adaption to links is in the range of milliseconds
  - is forward compatible to HTTP/3
- Default gateway (optional, all traffic of the device will be tunneled through the aggregation)
- Bonding proxy (optimization for TCP connection throughput)
- Terminates in different GEO regions (data centers)
- Data centers as a service (certificate based auth)
  - certificates and key material is rotated regularly automatically (ISO27001 compliance)
  - data centers always operate in a highly available configuration
- L3 only -> behaves like NAT

## Aggregation behavior

CloudLink generally will utilize all links simultaneously. It will start by filling up the lowest latency link,
until another link reaches comparable latency, and thus comparable estimated bandwidth capability.

With further loading of the aggregated link, additional bandwidth will be distributed across different
uplink, always trying to fill the uplink with the lowest latency possible.

This re-evaluation happens with every actual data payload package, so no measurement traffic will be
injected. Since this happens all the time, the typical re-evaluation latency for multiplexing
to the best possible uplinks, is within a single round trip time of the current aggregated link.

For prioritized links, the priority will override that behavior so that links with higher priority
will be filled first. This is a very useful scenario when using multiple SIM cards with different
cost structure or SLAs, in order to prefer the cheapest or best uplink first. Additionally this is
also the preferred operating mode when working with ethernet/DSL/fiber WAN uplinks and modem fallbacks,
but there typically the same behavior would happen fully automatically even without any prioritization
due to the higher latency of LTE/5G compared to ethernet based links.

## Supported devices

Currently supported devices:
- all Unwired Routers with Unwired Edge Cloud OS (Netmodule, Lanner, GSP, Teltonika, Unwired Networks)
- Teltonika devices with RutOS
  - [Guide: how to use CloudLink with Teltonika RutOS devices](/docs/cloudlink/teltonika_cloudlink.md)