strict_chain
proxy_dns
http 172.16.20.2 3128

root@kali:~# proxychains apt-get update
ProxyChains-3.1 (http://proxychains.sf.net)
0% [Working]|DNS-request| http.kali.org
0% [Connecting to http.kali.org]|S-chain|-<>-172.16.20.2:3128-<><>-4.2.2.2:53-<--denied
|DNS-response|: http.kali.org does not exist
Ign:1 http://http.kali.org/kali kali-rolling InRelease
0% [Working]^C

# proxychains.conf  VER 4

#        HTTP, SOCKS4, SOCKS5 tunneling proxifier with DNS.

# The option below identifies how the ProxyList is treated.
# only one option should be uncommented at time,
# otherwise the last appearing option will be accepted

dynamic_chain

#Dynamic - Each connection will be done via chained proxies
# all proxies chained in the order as they appear in the list
# at least one proxy must be online to play in chain
# (dead proxies are skipped)
# otherwise EINTR is returned to the app

#strict_chain

# Strict - Each connection will be done via chained proxies
# all proxies chained in the order as they appear in the list
# all proxies must be online to play in chain
# otherwise EINTR is returned to the app