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# nack
nack demonstrates how to send RTP packets over a connection that both generates and handles NACKs
## Instructions
### run main.go
```
go run main.go
```
You will then see output like
```
$ go run main.go
2020/12/16 00:27:54 Received RTP
2020/12/16 00:27:54 Received RTP
2020/12/16 00:27:54 Received RTP
2020/12/16 00:27:54 Received RTP
2020/12/16 00:27:54 Received RTP
2020/12/16 00:27:55 Received RTP
2020/12/16 00:27:55 Received NACK
2020/12/16 00:27:55 Received RTP
2020/12/16 00:27:55 Received RTP
2020/12/16 00:27:55 Received RTP
2020/12/16 00:27:55 Received RTP
2020/12/16 00:27:56 Received RTP
2020/12/16 00:27:56 Received NACK
2020/12/16 00:27:56 Received RTP
2020/12/16 00:27:56 Received NACK
2020/12/16 00:27:56 Received RTP
2020/12/16 00:27:56 Received RTP
2020/12/16 00:27:56 Received RTP
2020/12/16 00:27:57 Received RTP
2020/12/16 00:27:57 Received RTP
2020/12/16 00:27:57 Received RTP
2020/12/16 00:27:58 Received RTP
2020/12/16 00:27:58 Received NACK
2020/12/16 00:27:58 Received RTP
2020/12/16 00:27:58 Received RTP
2020/12/16 00:27:58 Received RTP
2020/12/16 00:27:58 Received NACK
2020/12/16 00:27:58 Received RTP
2020/12/16 00:27:58 Received RTP
```
### Introduce loss
You will not see much loss on loopback by default. To introduce 15% loss you can do
```
$ iptables -A INPUT -m statistic --mode random --probability 0.15 -p udp -j DROP
```
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