“Bonding” and “load balancing” are two of the most misunderstood terms in the Peplink world. People often use them interchangeably, but they solve very different problems, and picking the wrong one is usually the reason a connection that should be rock-solid still hiccups during a video call.

The single biggest point of confusion is what we mean by a “stream” of data. Most people assume one stream equals one user. It doesn't. A single user browsing the web, checking email, and joining a Teams call is generating many separate streams (sessions) at once. That distinction is the whole key to understanding when to use bonding and when to use load balancing, so let's dig in.

Load Balancing: Spreading Many Sessions Across Many Links

Load balancing takes all the individual sessions crossing your Peplink device and distributes them across your available WAN links. Each session (a web page load, a file download, a single API call) is assigned to one link and stays there for its lifetime.

Think of it like a highway with several lanes. Cars (sessions) are spread across the lanes to keep traffic moving, but each individual car stays in its lane from on-ramp to off-ramp. This is fantastic when you have lots of traffic from one or many users, because the combined capacity of all your links is put to good use.

Peplink gives you eight load balancing algorithms so you can decide how sessions get distributed:

• Weighted Balance: send more sessions to your faster or cheaper links using a ratio you set.
• Priority: use your preferred link(s) first and only spill over to others when needed.
• Overflow: keep traffic on the primary link until it's saturated, then overflow to the next.
• Persistence: keep a given source or destination pinned to the same link (important for sites that break when your IP changes, like banking or some logins).
• Enforced: force specific traffic down a specific link, no exceptions.
• Least Used: send new sessions to the link with the least traffic.
• Lowest Latency: send new sessions to the most responsive link.
• Fastest Response Time: pick the link that answers quickest.

Here's the catch, and it's the reason load balancing isn't the answer for everything: because each session lives on a single link, if that link drops, every session riding on it drops too. Your web page reloads and your download resumes on a healthy link, which is no big deal for browsing. But for a live video call, dropping the link means dropping the call.

Bonding: One Stream Across Many Links at Once

Bonding is different. Instead of assigning a session to a single link, SpeedFusion bonding combines multiple WAN links into one logical pipe and splits the packets of a single stream across all of them simultaneously. The links work together for that one flow.

Back to the highway analogy: bonding is like taking one very long truckload and splitting the cargo across several lanes at the same time, then reassembling it perfectly at the destination. If one lane closes mid-trip, the cargo in the remaining lanes keeps moving and the load survives.

This is why bonding is the right choice for a single, critical stream that must survive the loss of one or more connections. Classic examples:

• Live video streaming and broadcast contribution feeds
• Video conferencing (Zoom, Teams, Google Meet)
• VoIP and phone calls
• Any real-time session where a dropped connection means a dropped experience

Because bonding runs inside a SpeedFusion tunnel, it also unlocks a set of features that make that single stream remarkably resilient:

• Hot Failover: if a link fails, the stream continues over the surviving links with no session drop. The call keeps going.
• WAN Smoothing: sends duplicate packets across multiple links to hide jitter and packet loss, trading a bit of bandwidth for a much smoother real-time experience.
• Forward Error Correction (FEC): adds redundant data so lost packets can be rebuilt on the far end without waiting for a retransmission, which is critical for real-time traffic.

Why “One User” Doesn't Mean “One Stream”

This is the misconception we run into most often. Someone says, “I only have one user, so I need bonding.” Not necessarily!

A single user is almost always generating many concurrent sessions: browser tabs, cloud sync, email, streaming music, software updates. Those sessions can be spread across all your links beautifully with load balancing, giving that one user the benefit of your combined bandwidth without any tunnel overhead.

Bonding only becomes necessary when that user has a single session that is both important and sensitive to interruption, such as the video call, the live stream, or the VoIP line. In practice, many real-world setups use both: load balancing for general internet traffic, and a SpeedFusion bonded tunnel carrying just the critical real-time streams.

Quick Rule of Thumb

• Lots of sessions, want to use all your bandwidth, occasional drops are tolerable? Use Load Balancing.
• One critical stream that cannot drop when a link fails? Use SpeedFusion Bonding.

Get this distinction right and your Peplink deployment will behave exactly the way you expect: fast for everyday traffic, and unbreakable for the streams that matter.

Not sure which approach fits your deployment, or want help setting up a bonded SpeedFusion tunnel? Llama Networks is a Peplink Partner and we're happy to help. Reach out to sales[at]llamanetworks[dot]com.