プロキシチェーンはプロキシを経由しません。

Kali Linux 2020.2を使用しており、構成は/etc/proxychains.conf次のとおりです。

# proxychains.conf  VER 3.1
#
#        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
#
#random_chain
#
# Random - Each connection will be done via random proxy
# (or proxy chain, see  chain_len) from the list.
# this option is good to test your IDS :)

# Make sense only if random_chain
#chain_len = 2

# Quiet mode (no output from library)
#quiet_mode

# Proxy DNS requests - no leak for DNS data
proxy_dns 

# Some timeouts in milliseconds
tcp_read_time_out 15000
tcp_connect_time_out 8000

# ProxyList format
#       type  host  port [user pass]
#       (values separated by 'tab' or 'blank')
#
#
#        Examples:
#
#               socks5  192.168.67.78   1080    lamer   secret
#       http    192.168.89.3    8080    justu   hidden
#       socks4  192.168.1.49    1080
#           http    192.168.39.93   8080    
#       
#
#       proxy types: http, socks4, socks5
#        ( auth types supported: "basic"-http  "user/pass"-socks )
#
[ProxyList]
# add proxy here ...
# meanwile
# defaults set to "tor"
socks5  127.0.0.1   9050
socks4  127.0.0.1   9050

また、プロキシチェーンの使用中にTorをインストールして実行しています。出力は次のとおりですtor status。

root@kali:~# service tor status
● tor.service - Anonymizing overlay network for TCP (multi-instance-master)
     Loaded: loaded (/lib/systemd/system/tor.service; disabled; vendor preset: disabled)
     Active: active (exited) since Sat 2020-06-13 19:33:10 UTC; 3s ago
    Process: 13092 ExecStart=/bin/true (code=exited, status=0/SUCCESS)
   Main PID: 13092 (code=exited, status=0/SUCCESS)

Jun 13 19:33:10 kali systemd[1]: Stopped Anonymizing overlay network for TCP (multi-instance-master).
Jun 13 19:33:10 kali systemd[1]: Stopping Anonymizing overlay network for TCP (multi-instance-master)...
Jun 13 19:33:10 kali systemd[1]: Starting Anonymizing overlay network for TCP (multi-instance-master)...
Jun 13 19:33:10 kali systemd[1]: Finished Anonymizing overlay network for TCP (multi-instance-master).

ただし、を入力すると、proxychains firefox www.whatismyip.com同じIPアドレスが再び表示され、次はコマンドの出力です。

root@kali:~# proxychains firefox www.whatismyip.com
ProxyChains-3.1 (http://proxychains.sf.net)
root@kali:~#

助けてくれてありがとう。