notes on Linux network emulation for local processes

netem_veth.sh

sudo ip netns add client_ns
sudo ip link  add veth0 type veth peer name veth1
sudo ip link  set veth1 netns client_ns

sudo ip link  set dev veth0 up
sudo ip addr  add 192.168.250.10/24 dev veth0
sudo tc qdisc add dev veth0 root netem delay 1000ms

sudo ip -n client_ns link  set dev veth1 up
sudo ip -n client_ns addr  add 192.168.250.11/24 dev veth1
sudo tc -n client_ns qdisc add dev veth1 root netem delay 1000ms


socat  tcp-l:1234,fork,reuseaddr,bind=192.168.250.10 exec:date

# in another terminal do: 
# this gets you a shell in the client_ns
sudo ip netns exec client_ns su user
# then do this from su shell:
date; socat stdio tcp:192.168.250.10:1234