tcp connection test

tcp-test-client

#!/usr/bin/env bash

TARGET_HOST="$1"
TARGET_PORT="$2"

echo "starting tcpdump"
tcpdump -w "tcp-test-client_${TARGET_PORT}_%Y%m%d-%H%M%S.pcap" -G 3600 "ip6 and (src port $TARGET_PORT or dst port $TARGET_PORT)" &
TCPDUMP_PID=$!

function cleanup()
{
    echo "stopping tcpdump"
    kill $TCPDUMP_PID
    wait $TCPDUMP_PID
}

trap cleanup EXIT

while true; do
    DATE=$(date)
    NC_OUT=$(echo "$DATE" | nc -6v -w1 -N "$TARGET_HOST" "$TARGET_PORT" 2>&1)

    echo "$DATE -> $NC_OUT"
    sleep 5
done

tcp-test-server

#!/usr/bin/env bash

LISTEN_HOST="$1"
LISTEN_PORT="$2"

echo "starting tcpdump"
tcpdump -w "tcp-test-server_${LISTEN_PORT}_%Y%m%d-%H%M%S.pcap" -G 3600 "ip6 and (src port $LISTEN_PORT or dst port $LISTEN_PORT)" &
TCPDUMP_PID=$!

function cleanup()
{
    echo "stopping tcpdump"
    kill $TCPDUMP_PID
    wait $TCPDUMP_PID
}

trap cleanup EXIT

echo "starting netcat on $LISTEN_PORT"
nc -klv -s "$LISTEN_HOST" -p "$LISTEN_PORT" 2>&1 | while read -r line; do
    printf '%s -> %s\n' "$(date)" "$line"
done