diff --git a/sisr1/tp04/auto_nat/README.md b/sisr1/tp04/auto_nat/README.md
new file mode 100644
index 0000000..d433438
--- /dev/null
+++ b/sisr1/tp04/auto_nat/README.md
@@ -0,0 +1,2 @@
+Copy to /etc/systemd/system . (Do not put the space or the dot, nor this text in parentheses or the text that's before the first forwards slash)
+Anywhere else will NOT WORK !
\ No newline at end of file
diff --git a/sisr1/tp04/auto_nat/nat.service b/sisr1/tp04/auto_nat/nat.service
new file mode 100644
index 0000000..d3d2afd
--- /dev/null
+++ b/sisr1/tp04/auto_nat/nat.service
@@ -0,0 +1,9 @@
+[Unit]
+Description=Running nat.sh script on startup thanks to a systemd unit.
+
+[Service]
+Type=oneshot
+ExecStart=/bin/bash /root/nat.sh
+
+[Install]
+WantedBy=multi-user.target
diff --git a/sisr1/tp04/scripts_and_files/Users.csv b/sisr1/tp04/scripts_and_files/Users.csv
new file mode 100644
index 0000000..9dfb324
--- /dev/null
+++ b/sisr1/tp04/scripts_and_files/Users.csv
@@ -0,0 +1,30 @@
+Ermengarde,Berthelmot,eberthelmot0@webmd.com,Female,Accountant,
+Kassi,Bunker,kbunker1@xinhuanet.com,Female,Production,
+Moises,McCallum,mmccallum2@i2i.jp,Male,Production,
+Patrizio,Lune,plune3@upenn.edu,Male,Accountant,
+Blanch,Everix,beverix4@php.net,Female,Accountant,
+Stafani,Kibbel,skibbel5@marriott.com,Female,Production,
+Ignacius,Mosdell,imosdell6@cloudflare.com,Male,Management,
+Jeana,Waller-Bridge,jwallerbridge7@mapy.cz,Female,Management,
+Elroy,Dressel,edressel8@opera.com,Male,Production,
+Thea,Strettell,tstrettell9@nature.com,Female,Production,
+Solomon,Insoll,sinsolla@utexas.edu,Male,Accountant,
+Carri,Feedome,cfeedomeb@ask.com,Female,Accountant,
+Padraic,Chetwind,pchetwindc@last.fm,Male,Management,
+Solly,D'Ugo,sdugod@uiuc.edu,Male,Production,
+Konstanze,MacCostigan,kmaccostigane@seattletimes.com,Female,Accountant,
+Roxane,Powlesland,rpowleslandf@pcworld.com,Female,Management,
+Orelle,Kennealy,okennealyg@arstechnica.com,Female,Production,
+Sukey,Soitoux,ssoitouxh@shinystat.com,Female,Production,
+Nelli,Syce,nsycei@blogger.com,Female,Production,
+Clarisse,Shillam,cshillamj@dailymotion.com,Female,Production,
+Carin,Gueny,cguenyk@naver.com,Female,Management,
+Donny,Riepel,driepell@addtoany.com,Male,Production,
+Daniella,Ralfe,dralfem@wunderground.com,Female,Production,
+Lexy,Clynmans,lclynmansn@furl.net,Female,Production,
+Gardiner,Adamthwaite,gadamthwaiteo@spotify.com,Male,Production,
+Woodman,Lippett,wlippettp@purevolume.com,Male,Production,
+Nadya,Munnion,nmunnionq@flavors.me,Female,Production,
+Llewellyn,Habershon,lhabershonr@alibaba.com,Male,Production,
+Isaak,Greatrex,igreatrexs@seesaa.net,Male,Production,
+Darill,Frostdyke,dfrostdyket@cafepress.com,Male,Production,
diff --git a/sisr1/tp04/scripts_and_files/createLogins.sh b/sisr1/tp04/scripts_and_files/createLogins.sh
new file mode 100644
index 0000000..197c424
--- /dev/null
+++ b/sisr1/tp04/scripts_and_files/createLogins.sh
@@ -0,0 +1,17 @@
+#!/bin/bash
+#
+rm ./logins.csv
+while read line
+do
+	touch ./temptp4.txt
+	file='./temptp4.txt'
+	echo $line > $file
+	surname=$(cut -d "," -f 1 $file)
+	name=$(cut -d "," -f 2 $file)
+	group=$(cut -d "," -f 5 $file)
+	initials=$(cut -c 1 $file)
+	id=$(echo $initials$name | tr [:upper:] [:lower:])
+	passwd=$(echo $RANDOM | md5sum | head -c 8)
+	echo $id","$passwd","$surname","$name","$group>> logins.csv
+	rm ./temptp4.txt
+done < ./Users.csv
diff --git a/sisr1/tp04/scripts_and_files/createUsers.sh b/sisr1/tp04/scripts_and_files/createUsers.sh
new file mode 100644
index 0000000..6ddd41d
--- /dev/null
+++ b/sisr1/tp04/scripts_and_files/createUsers.sh
@@ -0,0 +1,18 @@
+#!/bin/bash
+while read line
+do
+	touch ./temptp4.txt
+	file="./temptp4.txt"
+	echo $line > $file
+	user=$(cut -d "," -f 1 $file)
+	usergroup=$(cut -d "," -f 5 $file)
+	passwd=$(cut -d "," -f 2 $file)
+	if ! grep -q $usergroup /etc/group ; then
+		echo "tentative creation $usergroup"
+		groupadd "$usergroup"
+	fi
+	useradd --create-home --groups $usergroup --shell /bin/bash $user
+	(echo $passwd ; echo $passwd) | passwd $user
+	chown $user /home/$user
+	rm ./temptp4.txt
+done < ./logins.csv
diff --git a/sisr1/tp04/scripts_and_files/logins.csv b/sisr1/tp04/scripts_and_files/logins.csv
new file mode 100644
index 0000000..0053371
--- /dev/null
+++ b/sisr1/tp04/scripts_and_files/logins.csv
@@ -0,0 +1,30 @@
+eberthelmot,a0faa388,Ermengarde,Berthelmot,Accountant
+kbunker,cc9b1c09,Kassi,Bunker,Production
+mmccallum,81f11471,Moises,McCallum,Production
+plune,0a52910c,Patrizio,Lune,Accountant
+beverix,f0736efe,Blanch,Everix,Accountant
+skibbel,f890d6d1,Stafani,Kibbel,Production
+imosdell,a97cd2b8,Ignacius,Mosdell,Management
+jwaller-bridge,9c43389e,Jeana,Waller-Bridge,Management
+edressel,8831e520,Elroy,Dressel,Production
+tstrettell,0bd22c22,Thea,Strettell,Production
+sinsoll,91c81969,Solomon,Insoll,Accountant
+cfeedome,be5d9acb,Carri,Feedome,Accountant
+pchetwind,f60802f5,Padraic,Chetwind,Management
+sd'ugo,8b6cd4c2,Solly,D'Ugo,Production
+kmaccostigan,4114aff4,Konstanze,MacCostigan,Accountant
+rpowlesland,05e19a95,Roxane,Powlesland,Management
+okennealy,04f8d927,Orelle,Kennealy,Production
+ssoitoux,9e931572,Sukey,Soitoux,Production
+nsyce,29a54396,Nelli,Syce,Production
+cshillam,8a394f6a,Clarisse,Shillam,Production
+cgueny,6d30f53a,Carin,Gueny,Management
+driepel,45db9a6b,Donny,Riepel,Production
+dralfe,d14bcb76,Daniella,Ralfe,Production
+lclynmans,98d3e926,Lexy,Clynmans,Production
+gadamthwaite,4d6313a8,Gardiner,Adamthwaite,Production
+wlippett,9423f972,Woodman,Lippett,Production
+nmunnion,80f1c167,Nadya,Munnion,Production
+lhabershon,67c2be97,Llewellyn,Habershon,Production
+igreatrex,90715fb9,Isaak,Greatrex,Production
+dfrostdyke,4abe7ab1,Darill,Frostdyke,Production
diff --git a/sisr1/tp04/scripts_and_files/remoteCreation.sh b/sisr1/tp04/scripts_and_files/remoteCreation.sh
new file mode 100644
index 0000000..af7f04e
--- /dev/null
+++ b/sisr1/tp04/scripts_and_files/remoteCreation.sh
@@ -0,0 +1,8 @@
+#!/bin/bash
+scp ./createUsers.sh root@$1:/root
+scp ./logins.csv root@$1:/root
+ssh root@$1 "chmod -x /root/createUsers.sh"
+ssh root@$1 "bash /root/createUsers.sh"
+ssh root@$1 "rm /root/logins.csv"
+ssh root@$1 "rm /root/createUsers.sh"
+exit