I've introduced a 2000ms latency to all network packets using openwrt [netem](https://wiki.linuxfoundation.org/networking/netem) module.

```
# This is run on the terminal of the OpenWRT router
tc qdisc add dev wlan1 root netem delay 2000ms

```

I can clearly see the effects of this when pinging devices in the network.

```
# ping 192.168.10.164
PING 192.168.10.164 (192.168.10.164): 56 data bytes
64 bytes from 192.168.10.164: seq=0 ttl=64 time=2001.956 ms
64 bytes from 192.168.10.164: seq=1 ttl=64 time=2010.677 ms
64 bytes from 192.168.10.164: seq=2 ttl=64 time=2004.216 ms
64 bytes from 192.168.10.164: seq=3 ttl=64 time=2001.451 ms
64 bytes from 192.168.10.164: seq=4 ttl=64 time=2005.981 ms

```

However if I attempt to notice this delay while exchanging messages via `nc`, it seems to be ignored.

```
|---------------------|--------------------------------|
|    Terminal 1       |   Terminal 2                   |     
|   (192.168.10.164)  |   192.168.10.186               |
|---------------------|--------------------------------|
|  # nc -l 2389       |                                |
|                     | # nc 192.168.10.164 2389       |
|                     |      Hello                     |
|  # NO 2s DELAY      |                                |
|  # ALMOST INSTANT   |                                |
|    Hello            |                                |
|---------------------|--------------------------------|

```

My questions are:

* If it's just an case of a miss-configured `netem` module, what would be toe correct one which would apply delays on all IP packets?

*Update*
This seems to be caused by a bug in the netem module. After the router restart and replying the commands I am experiencing the expected delay.