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# `TCP_FASTOPEN` support in lws
Lws supports enabling TCP_FASTOPEN oper-vhost for listen sockets.
## Enabling per vhost serving
Set the `info.fo_listen_queue` to nonzero at vhost creation. Different
platforms interpret this number differently, zero always disables it
but on Linux, the number is interpreted as a SYN queue length.
On FreeBSD, OSX and Windows, the number is basically a bool, with the
extra restriction OSX and Windows only allows 0 or 1.
## Enabling Linux for serving with TCP_FASTOPEN
To configure the kernel for listening socket TCP_FASTOPEN, you need
```
# sysctl -w net.ipv4.tcp_fastopen=3
```
## Enabling BSD for serving with TCP_FASTOPEN
At least on FreeBSD, you need to set the net.inet.tcp.fastopen.enabled
sysctl to 1
## Enabling Windows for serving with TCP_FASTOPEN
```
> netsh int tcp set global fastopenfallback=disabled
> netsh int tcp show global
```
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