---
title: NEFilterFlowBytesMax
framework: networkextension
role: symbol
role_heading: Global Variable
path: networkextension/nefilterflowbytesmax
---

# NEFilterFlowBytesMax

The maximum number of bytes to pass or peek for a flow.

## Declaration

```swift
var NEFilterFlowBytesMax: UInt64 { get }
```

## Discussion

Discussion When used as a pass value, this value directs to flow to pass all upcoming bytes. When used as a peek value, it indicates the flow should peek as many bytes as possible.

## See Also

### Inspecting flow properties

- [url](networkextension/nefilterflow/url.md)
- [identifier](networkextension/nefilterflow/identifier.md)
- [direction](networkextension/nefilterflow/direction.md)
- [NETrafficDirection](networkextension/netrafficdirection.md)