---
title: client.socket.cwnd
summary: null
url: >-
  https://www.fastly.com/documentation/reference/vcl/variables/client-connection/client-socket-cwnd
---

**Type:** INTEGER  
**Access:** can be read and set, but not unset

**Available in:** recv, deliver, fetch, log, error

`client.socket.tcpi_snd_cwnd` is
a read-only alias of `client.socket.cwnd`.