Christian KleinNetwork Alpine
Caution
This is only meant to be used inside testing networks. Do NOT use for production!
Just an alpine image with common packages for network troubleshooting installed:
- bash, vim, nano, python3
- jq, pv, git, wget, curl
- curl, openssh, lftp,
- lighttpd, lldpd
- bind-tools (dig), tcpdump
- socat, iperf, iperf3
- nmap, fping
By default a HTTP Server is available on port 80. Change the port with HTTP_SERVER_PORT.
Example Use Cases
# See current IP configuration
ip address
ip route
# Set IP address
ip address add 10.1.1.3/24 dev eth0
ip address add broadcast 10.1.2.255 dev eth0
# Set Gateway
ip route del default
ip route add default 10.1.1.0/24 via 10.1.1.3
# Request new IP address via DHCP
ip addr flush dev eth0
udhcpc -i eth0 -n -q
# Set DNS
nano /etc/resolv.conf # Update line "namesperver x.x.x.x"
# Query DNS
dig example.com A @10.1.1.3
# List LLDP neighbors
lldpcli show neighbors
# Ping a host
ping -I eth0 10.1.1.3
# Send HTTP Request
curl http://10.1.1.3 -v
# Connect somewhere via SSH
ssh user@10.1.1.3 -p 22
# Copy file via SFTP
scp file.txt user@10.1.1.3:~
# Interactively browse FTP server
lftp ftp://user@10.1.1.3
# Connect to a TCP port
nc 10.1.1.3 80
# Scan for open TCP ports
nmap -sT -p 22-10000 10.1.1.3
# Ping all IPs in the network
fping -g -r 1 -q -a 10.1.1.0/24
# Capture network traffic
tcpdump # Capture ALL traffic
tcpdump -i eth0 icmp # Filter for ICMP traffic
tcpdump -i eth0 -w capture.pcap # Write to file
tcpdump -r capture.pcap # Read from file
# Test unicast bandwidth
iperf3 -s # Setup server on host 10.1.1.2
iperf3 -c 10.1.1.2 # Check TCP downlink from 10.1.1.2
iperf3 -c 10.1.1.2 -u # Check UDP downlink from 10.1.1.2
# Test multicast connectivity (with iperf)
iperf -s -u -B 224.0.67.67 -i 1 # Setup multicast receiver
iperf -c 224.0.67.67 -u --ttl 5 -t 10 -b 1M # Send for 10 seconds at 1 MBit/s
# Test multicast connectivity (with socat)
seq 50 | xargs -Iz echo "Hello World" | pv -qL 2 | socat -u - UDP4-DATAGRAM:239.255.10.10:5000,ip-multicast-ttl=1 # Sender
socat -u UDP4-RECV:5000,ip-add-membership=239.255.10.10:0.0.0.0 - # Receiver