jclingensmith

Some tools allow or even require -6 as a command line option, and curl requires an IPv6 address to be in [] (square brackets). Also, for link local addresses, you usually have to specify the local interface you want to use.

• ping 2001:7b8:666:ffff::1:42 -I eth0
• nmap -6 2001:7b8:666:ffff::1:42%eth0
• curl http://[2001:7b8:666:ffff::1:42]:8080/ --interface eth0
• wget http://[2001:7b8:666:ffff::1:42]:8080/
• telnet -6 2001:7b8:666:ffff::1:42
• nc -6 2001:7b8:666:ffff::1:42%eth0 23

Want to find link local addresses for systems in your network segment? Try hitting local hosts and routers with these multicast addresses:

jclingensmith

# Find a Linux executable named python3 in the /usr/ directory (finds the python3 executable)
find /usr -name "python3*" -exec file {} \; | grep ELF

# Loop over a set of numbers (pings 192.168.1.1 through 192.168.1.255)
for i in {1..255}; do sudo /usr/bin/ping -c1 192.168.1.$i; done

# Loop over lines in a file; write to a file (resolves hostnames to IP addresses)
while read f; do dig A $f +short; done < hosts.txt > ips.txt

# Loop over files ending in txt in your current directory (counts lines in files)

jclingensmith

#!/bin/sh

# https://collinmbarrett.com/protonvpn-dd-wrt-api-script/

# specify PATH to run from cron
PATH=/bin:/usr/bin:/sbin:/usr/sbin:/jffs/sbin:/jffs/bin:/jffs/usr/sbin:/jffs/usr/bin:/mmc/sbin:/mmc/bin:/mmc/usr/sbin:/mmc/usr/bin:/opt/sbin:/opt/bin:/opt/usr/sbin:/opt/usr/bin

# kill openvpn
PID=$(pidof openvpn)
kill -s SIGTERM "$PID"

jclingensmith

System Updates

http://bookofzeus.com/harden-ubuntu/initial-setup/system-updates/

Keeping the system updated is vital before starting anything on your system. This will prevent people to use known vulnerabilities to enter in your system.

sudo apt-get update
sudo apt-get upgrade
sudo apt-get autoremove
sudo apt-get autoclean