diff --git a/SCR2.1/ARM/TP18/#shift-experiment.s# b/SCR2.1/ARM/TP18/#shift-experiment.s#
new file mode 100644
index 0000000..a48824a
--- /dev/null
+++ b/SCR2.1/ARM/TP18/#shift-experiment.s#
@@ -0,0 +1,22 @@
+.equ SYS_EXIT, 93
+
+.data
+
+int1: .quad 1
+int2: .quad 2
+
+.text
+.globl _start
+
+_start:
+
+mov x0,#1
+lsl x5,x0,#3	
+lsr x5,x0,#1
+	
+mov w8,#SYS_EXIT
+mov x0,#0
+svc #0
+
+.end
+
diff --git a/SCR2.1/ARM/TP18/a.out b/SCR2.1/ARM/TP18/a.out
new file mode 100755
index 0000000..2cb6a77
Binary files /dev/null and b/SCR2.1/ARM/TP18/a.out differ
diff --git a/SCR2.1/ARM/TP18/barrel-experiment.o b/SCR2.1/ARM/TP18/barrel-experiment.o
new file mode 100644
index 0000000..cae69c7
Binary files /dev/null and b/SCR2.1/ARM/TP18/barrel-experiment.o differ
diff --git a/SCR2.1/ARM/TP18/barrel-experiment.s b/SCR2.1/ARM/TP18/barrel-experiment.s
new file mode 100644
index 0000000..f3b259c
--- /dev/null
+++ b/SCR2.1/ARM/TP18/barrel-experiment.s
@@ -0,0 +1,22 @@
+	.equ SYS_EXIT, 93
+	.data
+int1:   .quad 1
+int2:   .quad 2
+	.text
+	.globl _start
+
+_start:
+
+	mov x0,#15
+	
+	add x1,x0,x0,lsl #4
+	
+	mov x2,#1
+	sub x1,xzr,x2,lsl #3
+
+	mov w8,#SYS_EXIT
+	mov w0,#0
+	svc #0
+
+.end
+
diff --git a/SCR2.1/ARM/TP18/shift-experiment.o b/SCR2.1/ARM/TP18/shift-experiment.o
new file mode 100644
index 0000000..46b2fee
Binary files /dev/null and b/SCR2.1/ARM/TP18/shift-experiment.o differ
diff --git a/SCR2.1/ARM/TP18/shift-experiment.s b/SCR2.1/ARM/TP18/shift-experiment.s
new file mode 100644
index 0000000..fdd00f5
--- /dev/null
+++ b/SCR2.1/ARM/TP18/shift-experiment.s
@@ -0,0 +1,19 @@
+	.equ SYS_EXIT, 93
+	.data
+int1:   .quad 1
+int2:   .quad 2
+	.text
+	.globl _start
+
+_start:
+
+	mov x0,#1
+	lsl x5,x0,#3
+	lsr x5,x0,#1
+	
+	mov w8,#SYS_EXIT
+	mov w0,#0
+	svc #0
+
+.end
+
diff --git a/SCR2.1/ARM/TP18/shift-experiment.s~ b/SCR2.1/ARM/TP18/shift-experiment.s~
new file mode 100644
index 0000000..bcedc96
--- /dev/null
+++ b/SCR2.1/ARM/TP18/shift-experiment.s~
@@ -0,0 +1,19 @@
+.equ SYS_EXIT, 93
+.data
+int1: .quad 1
+int2: .quad 2
+.text
+.globl _start
+
+_start:
+
+	mov x0,#1
+	lsl x5,x0,#3
+	lsr x5,x0,#1
+	
+mov w8,#SYS_EXIT
+mov w0,#0
+svc #0
+
+.end
+
diff --git a/SCR2.1/ARM/TP18/solar-5-TP18-responses.txt b/SCR2.1/ARM/TP18/solar-5-TP18-responses.txt
index e69de29..1ef8391 100644
--- a/SCR2.1/ARM/TP18/solar-5-TP18-responses.txt
+++ b/SCR2.1/ARM/TP18/solar-5-TP18-responses.txt
@@ -0,0 +1,134 @@
+I)
+
+(gdb) l
+1		.equ SYS_EXIT, 93
+2		.data
+3	int1:   .quad 1
+4	int2:   .quad 2
+5		.text
+6		.globl _start
+7	
+8	_start:
+9	
+10		mov x0,#1
+(gdb) b 7
+Breakpoint 1 at 0x4000b0: file shift-experiment.s, line 10.
+(gdb) run
+Starting program: /export/home/an23/solar/SCR/SCR2.1/ARM/TP18/a.out 
+
+Breakpoint 1, _start () at shift-experiment.s:10
+10		mov x0,#1
+(gdb) i r x0 x5
+x0             0x0                 0
+x5             0x0                 0
+(gdb) s
+11		lsl x5,x0,#3
+(gdb) i r x0 x5
+x0             0x1                 1
+x5             0x0                 0
+(gdb) s
+12		lsr x5,x0,#1
+(gdb) i r x0 x5
+x0             0x1                 1
+x5             0x8                 8
+(gdb) s
+14		mov w8,#SYS_EXIT
+(gdb) i r x0 x5
+x0             0x1                 1
+x5             0x0                 0
+
+
+II)
+
+
+(gdb) l
+1		.equ SYS_EXIT, 93
+2		.data
+3	int1:   .quad 1
+4	int2:   .quad 2
+5		.text
+6		.globl _start
+7	
+8	_start:
+9	
+10		mov x0,#15
+(gdb) b 8
+Breakpoint 1 at 0x4000b0: file barrel-experiment.s, line 10.
+(gdb) rin
+Undefined command: "rin".  Try "help".
+(gdb) run
+Starting program: /export/home/an23/solar/SCR/SCR2.1/ARM/TP18/a.out 
+
+Breakpoint 1, _start () at barrel-experiment.s:10
+10		mov x0,#15
+(gdb) i r x1 x0
+x1             0x0                 0
+x0             0x0                 0
+(gdb) s
+12		add x1,x0,x0,lsl #4
+(gdb) i r x1 x0
+x1             0x0                 0
+x0             0xf                 15
+(gdb) s
+14		mov w8,#SYS_EXIT
+(gdb) i r x1 x0
+x1             0xff                255
+x0             0xf                 15
+
+
+3.
+
+
+(gdb) l
+1		.equ SYS_EXIT, 93
+2		.data
+3	int1:   .quad 1
+4	int2:   .quad 2
+5		.text
+6		.globl _start
+7	
+8	_start:
+9	
+10		mov x0,#15
+(gdb) b 8 
+Breakpoint 1 at 0x4000b0: file barrel-experiment.s, line 10.
+(gdb) run
+Starting program: /export/home/an23/solar/SCR/SCR2.1/ARM/TP18/a.out 
+
+Breakpoint 1, _start () at barrel-experiment.s:10
+10		mov x0,#15
+(gdb) i r x0 x1 x2
+x0             0x0                 0
+x1             0x0                 0
+x2             0x0                 0
+(gdb) s
+12		add x1,x0,x0,lsl #4
+(gdb) i r x0 x1 x2
+x0             0xf                 15
+x1             0x0                 0
+x2             0x0                 0
+(gdb) s
+14		mov x2,#1
+(gdb) i r x0 x1 x2
+x0             0xf                 15
+x1             0xff                255
+x2             0x0                 0
+(gdb) s
+15		sub x1,xzr,x2,lsl #3
+(gdb) i r x0 x1 x2
+x0             0xf                 15
+x1             0xff                255
+x2             0x1                 1
+(gdb) s
+17		mov w8,#SYS_EXIT
+(gdb) i r x0 x1 x2
+x0             0xf                 15
+x1             0xfffffffffffffff8  -8
+x2             0x1                 1
+
+
+
+
+
+
+
diff --git a/SCR2.2/TP20/simple1.imn b/SCR2.2/TP20/simple1.imn
new file mode 100644
index 0000000..08692ad
--- /dev/null
+++ b/SCR2.2/TP20/simple1.imn
@@ -0,0 +1,113 @@
+node n1 {
+    type pc
+    network-config {
+	hostname pc1
+	!
+	interface eth0
+	 ip address 172.16.1.1/16
+	 mac address 42:00:aa:00:00:03
+	!
+	interface lo0
+	 type lo
+	 ip address 127.0.0.1/8
+	 ipv6 address ::1/128
+	!
+    }
+    auto_default_routes enabled
+    canvas c0
+    iconcoords {144 312}
+    labelcoords {144 343}
+    interface-peer {eth0 n0}
+}
+
+node n2 {
+    type pc
+    network-config {
+	hostname pc2
+	!
+	interface eth0
+	 ip address 172.16.2.2/16
+	 mac address 42:00:aa:00:00:04
+	!
+	interface lo0
+	 type lo
+	 ip address 127.0.0.1/8
+	 ipv6 address ::1/128
+	!
+    }
+    auto_default_routes enabled
+    canvas c0
+    iconcoords {384 312}
+    labelcoords {384 343}
+    interface-peer {eth0 n0}
+}
+
+node n3 {
+    type pc
+    network-config {
+	hostname pc3
+	!
+	interface eth0
+	 ip address 172.16.3.3/16
+	 mac address 42:00:aa:00:00:05
+	!
+	interface lo0
+	 type lo
+	 ip address 127.0.0.1/8
+	 ipv6 address ::1/128
+	!
+    }
+    auto_default_routes enabled
+    canvas c0
+    iconcoords {576 312}
+    labelcoords {576 343}
+    interface-peer {eth0 n0}
+}
+
+node n0 {
+    type lanswitch
+    network-config {
+	hostname switch1
+	!
+    }
+    canvas c0
+    iconcoords {384 96}
+    labelcoords {384 119}
+    interface-peer {e0 n1}
+    interface-peer {e1 n2}
+    interface-peer {e2 n3}
+}
+
+link l0 {
+    nodes {n1 n0}
+    bandwidth 0
+}
+
+link l1 {
+    nodes {n2 n0}
+    bandwidth 0
+}
+
+link l2 {
+    nodes {n3 n0}
+    bandwidth 0
+}
+
+canvas c0 {
+    name {Canvas0}
+}
+
+option show {
+    interface_names yes
+    ip_addresses yes
+    ipv6_addresses yes
+    node_labels yes
+    link_labels yes
+    background_images no
+    annotations yes
+    hostsAutoAssign no
+    grid yes
+    iconSize normal
+    zoom 1.0
+}
+
diff --git a/SCR2.2/TP20/simple2.imn b/SCR2.2/TP20/simple2.imn
new file mode 100644
index 0000000..e1b790e
--- /dev/null
+++ b/SCR2.2/TP20/simple2.imn
@@ -0,0 +1,185 @@
+node n0 {
+    type host
+    network-config {
+	hostname host1
+	!
+	interface eth1
+	 ip address 172.16.2.254/24
+	!
+	interface eth0
+	 ip address 172.16.1.254/24
+	!
+	interface lo0
+	 type lo
+	 ip address 127.0.0.1/8
+	 ipv6 address ::1/128
+	!
+    }
+    auto_default_routes enabled
+    canvas c0
+    iconcoords {432 72}
+    labelcoords {432 108}
+    interface-peer {eth0 n1}
+    interface-peer {eth1 n2}
+}
+
+node n1 {
+    type lanswitch
+    network-config {
+	hostname switch1
+	!
+    }
+    canvas c0
+    iconcoords {264 216}
+    labelcoords {264 239}
+    interface-peer {e0 n0}
+    interface-peer {e1 n3}
+    interface-peer {e2 n4}
+}
+
+node n2 {
+    type lanswitch
+    network-config {
+	hostname switch2
+	!
+    }
+    canvas c0
+    iconcoords {600 216}
+    labelcoords {600 239}
+    interface-peer {e0 n0}
+    interface-peer {e1 n5}
+    interface-peer {e2 n6}
+}
+
+node n3 {
+    type pc
+    network-config {
+	hostname pc1
+	!
+	interface eth0
+	 ip address 172.16.1.1/24
+	!
+	interface lo0
+	 type lo
+	 ip address 127.0.0.1/8
+	 ipv6 address ::1/128
+	!
+    }
+    auto_default_routes enabled
+    canvas c0
+    iconcoords {120 360}
+    labelcoords {120 391}
+    interface-peer {eth0 n1}
+}
+
+node n4 {
+    type pc
+    network-config {
+	hostname pc2
+	!
+	interface eth0
+	 ip address 172.16.1.2/24
+	!
+	interface lo0
+	 type lo
+	 ip address 127.0.0.1/8
+	 ipv6 address ::1/128
+	!
+    }
+    auto_default_routes enabled
+    canvas c0
+    iconcoords {408 360}
+    labelcoords {408 391}
+    interface-peer {eth0 n1}
+}
+
+node n5 {
+    type pc
+    network-config {
+	hostname pc3
+	!
+	interface eth0
+	 ip address 172.16.2.1/24
+	!
+	interface lo0
+	 type lo
+	 ip address 127.0.0.1/8
+	 ipv6 address ::1/128
+	!
+    }
+    auto_default_routes enabled
+    canvas c0
+    iconcoords {504 360}
+    labelcoords {504 391}
+    interface-peer {eth0 n2}
+}
+
+node n6 {
+    type pc
+    network-config {
+	hostname pc4
+	!
+	interface eth0
+	 ip address 172.16.2.2/24
+	!
+	interface lo0
+	 type lo
+	 ip address 127.0.0.1/8
+	 ipv6 address ::1/128
+	!
+    }
+    auto_default_routes enabled
+    canvas c0
+    iconcoords {744 360}
+    labelcoords {744 391}
+    interface-peer {eth0 n2}
+}
+
+link l0 {
+    nodes {n1 n0}
+    bandwidth 0
+}
+
+link l1 {
+    nodes {n2 n0}
+    bandwidth 0
+}
+
+link l2 {
+    nodes {n1 n3}
+    bandwidth 0
+}
+
+link l3 {
+    nodes {n1 n4}
+    bandwidth 0
+}
+
+link l4 {
+    nodes {n2 n5}
+    bandwidth 0
+}
+
+link l5 {
+    nodes {n6 n2}
+    bandwidth 0
+}
+
+canvas c0 {
+    name {Canvas0}
+}
+
+option show {
+    interface_names yes
+    ip_addresses yes
+    ipv6_addresses yes
+    node_labels yes
+    link_labels yes
+    background_images no
+    annotations yes
+    hostsAutoAssign no
+    grid yes
+    iconSize normal
+    zoom 1.0
+}
+
diff --git a/SCR2.2/TP20/simple3.imn b/SCR2.2/TP20/simple3.imn
new file mode 100644
index 0000000..cc5fc55
--- /dev/null
+++ b/SCR2.2/TP20/simple3.imn
@@ -0,0 +1,368 @@
+node n0 {
+    type host
+    network-config {
+	hostname host1
+	!
+	interface eth1
+	 ip address 192.168.64.254/18
+	!
+	interface eth0
+	 ip address 192.168.0.254/18
+	!
+	interface lo0
+	 type lo
+	 ip address 127.0.0.1/8
+	 ipv6 address ::1/128
+	!
+    }
+    auto_default_routes enabled
+    canvas c0
+    iconcoords {216 168}
+    labelcoords {216 204}
+    interface-peer {eth0 n2}
+    interface-peer {eth1 n3}
+}
+
+node n1 {
+    type host
+    network-config {
+	hostname host2
+	!
+	interface eth2
+	 ip address 192.168.64.253/18
+	!
+	interface eth1
+	 ip address 192.168.192.254/18
+	!
+	interface eth0
+	 ip address 192.168.128.254/18
+	!
+	interface lo0
+	 type lo
+	 ip address 127.0.0.1/8
+	 ipv6 address ::1/128
+	!
+    }
+    canvas c0
+    iconcoords {624 168}
+    labelcoords {624 204}
+    interface-peer {eth0 n4}
+    interface-peer {eth1 n5}
+    interface-peer {eth2 n3}
+}
+
+node n2 {
+    type lanswitch
+    network-config {
+	hostname switch1
+	!
+    }
+    canvas c0
+    iconcoords {72 264}
+    labelcoords {72 287}
+    interface-peer {e0 n0}
+    interface-peer {e1 n7}
+    interface-peer {e2 n6}
+}
+
+node n3 {
+    type lanswitch
+    network-config {
+	hostname switch2
+	!
+    }
+    canvas c0
+    iconcoords {360 264}
+    labelcoords {360 287}
+    interface-peer {e0 n0}
+    interface-peer {e1 n9}
+    interface-peer {e2 n8}
+    interface-peer {e3 n1}
+}
+
+node n4 {
+    type lanswitch
+    network-config {
+	hostname switch3
+	!
+    }
+    canvas c0
+    iconcoords {600 264}
+    labelcoords {600 287}
+    interface-peer {e0 n1}
+    interface-peer {e1 n11}
+    interface-peer {e2 n10}
+}
+
+node n5 {
+    type lanswitch
+    network-config {
+	hostname switch4
+	!
+    }
+    canvas c0
+    iconcoords {792 312}
+    labelcoords {792 335}
+    interface-peer {e0 n1}
+    interface-peer {e1 n13}
+    interface-peer {e2 n12}
+}
+
+node n6 {
+    type pc
+    network-config {
+	hostname pc1
+	!
+	interface eth0
+	 ip address 192.168.0.1/18
+	!
+	interface lo0
+	 type lo
+	 ip address 127.0.0.1/8
+	 ipv6 address ::1/128
+	!
+	ip route 0.0.0.0/0 192.168.0.254
+	!
+    }
+    auto_default_routes enabled
+    canvas c0
+    iconcoords {24 456}
+    labelcoords {24 487}
+    interface-peer {eth0 n2}
+}
+
+node n7 {
+    type pc
+    network-config {
+	hostname pc2
+	!
+	interface eth0
+	 ip address 192.168.0.2/18
+	!
+	interface lo0
+	 type lo
+	 ip address 127.0.0.1/8
+	 ipv6 address ::1/128
+	!
+	ip route 0.0.0.0/0 192.168.0.254
+	!
+    }
+    auto_default_routes enabled
+    canvas c0
+    iconcoords {168 504}
+    labelcoords {168 535}
+    interface-peer {eth0 n2}
+}
+
+node n8 {
+    type pc
+    network-config {
+	hostname pc3
+	!
+	interface eth0
+	 ip address 192.168.64.1/18
+	!
+	interface lo0
+	 type lo
+	 ip address 127.0.0.1/8
+	 ipv6 address ::1/128
+	!
+	ip route 0.0.0.0/0 192.168.64.253
+	ip route 0.0.0.0/0 192.168.64.254
+	!
+    }
+    auto_default_routes enabled
+    canvas c0
+    iconcoords {264 408}
+    labelcoords {264 439}
+    interface-peer {eth0 n3}
+}
+
+node n9 {
+    type pc
+    network-config {
+	hostname pc4
+	!
+	interface eth0
+	 ip address 192.168.64.2/18
+	!
+	interface lo0
+	 type lo
+	 ip address 127.0.0.1/8
+	 ipv6 address ::1/128
+	!
+    }
+    auto_default_routes enabled
+    canvas c0
+    iconcoords {408 504}
+    labelcoords {408 535}
+    interface-peer {eth0 n3}
+}
+
+node n10 {
+    type pc
+    network-config {
+	hostname pc5
+	!
+	interface eth0
+	 ip address 192.168.128.1/18
+	!
+	interface lo0
+	 type lo
+	 ip address 127.0.0.1/8
+	 ipv6 address ::1/128
+	!
+    }
+    auto_default_routes enabled
+    canvas c0
+    iconcoords {504 408}
+    labelcoords {504 439}
+    interface-peer {eth0 n4}
+}
+
+node n11 {
+    type pc
+    network-config {
+	hostname pc6
+	!
+	interface eth0
+	 ip address 192.168.128.2/18
+	!
+	interface lo0
+	 type lo
+	 ip address 127.0.0.1/8
+	 ipv6 address ::1/128
+	!
+    }
+    auto_default_routes enabled
+    canvas c0
+    iconcoords {648 504}
+    labelcoords {648 535}
+    interface-peer {eth0 n4}
+}
+
+node n12 {
+    type pc
+    network-config {
+	hostname pc7
+	!
+	interface eth0
+	 ip address 192.168.192.1/18
+	!
+	interface lo0
+	 type lo
+	 ip address 127.0.0.1/8
+	 ipv6 address ::1/128
+	!
+    }
+    auto_default_routes enabled
+    canvas c0
+    iconcoords {744 408}
+    labelcoords {744 439}
+    interface-peer {eth0 n5}
+}
+
+node n13 {
+    type pc
+    network-config {
+	hostname pc8
+	!
+	interface eth0
+	 ip address 192.168.192.2/18
+	!
+	interface lo0
+	 type lo
+	 ip address 127.0.0.1/8
+	 ipv6 address ::1/128
+	!
+    }
+    auto_default_routes enabled
+    canvas c0
+    iconcoords {840 504}
+    labelcoords {840 535}
+    interface-peer {eth0 n5}
+}
+
+link l0 {
+    nodes {n2 n0}
+    bandwidth 0
+}
+
+link l1 {
+    nodes {n3 n0}
+    bandwidth 0
+}
+
+link l2 {
+    nodes {n4 n1}
+    bandwidth 0
+}
+
+link l3 {
+    nodes {n5 n1}
+    bandwidth 0
+}
+
+link l4 {
+    nodes {n13 n5}
+    bandwidth 0
+}
+
+link l5 {
+    nodes {n12 n5}
+    bandwidth 0
+}
+
+link l6 {
+    nodes {n11 n4}
+    bandwidth 0
+}
+
+link l7 {
+    nodes {n10 n4}
+    bandwidth 0
+}
+
+link l8 {
+    nodes {n9 n3}
+    bandwidth 0
+}
+
+link l9 {
+    nodes {n8 n3}
+    bandwidth 0
+}
+
+link l10 {
+    nodes {n7 n2}
+    bandwidth 0
+}
+
+link l11 {
+    nodes {n6 n2}
+    bandwidth 0
+}
+
+link l12 {
+    nodes {n1 n3}
+    bandwidth 0
+}
+
+canvas c0 {
+    name {Canvas0}
+}
+
+option show {
+    interface_names yes
+    ip_addresses yes
+    ipv6_addresses yes
+    node_labels yes
+    link_labels yes
+    background_images no
+    annotations yes
+    hostsAutoAssign no
+    grid yes
+    iconSize normal
+    zoom 1.0
+}
+
diff --git a/SCR2.2/TP20/solar-5-TP20-repones.txt b/SCR2.2/TP20/solar-5-TP20-repones.txt
new file mode 100644
index 0000000..c1f99a0
--- /dev/null
+++ b/SCR2.2/TP20/solar-5-TP20-repones.txt
@@ -0,0 +1,36 @@
+PC 1:
+Clique droit tcpdump 
+
+tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
+listening on eth0, link-type EN10MB (Ethernet), capture size 262144 bytes
+14:40:16.534494 IP 172.16.1.1 > 172.16.3.3: ICMP echo request, id 3, seq 1, length 64
+14:40:16.534582 IP 172.16.3.3 > 172.16.1.1: ICMP echo reply, id 3, seq 1, length 64
+14:40:21.665229 ARP, Request who-has 172.16.3.3 tell 172.16.1.1, length 28
+14:40:21.665295 ARP, Request who-has 172.16.1.1 tell 172.16.3.3, length 28
+14:40:21.665317 ARP, Reply 172.16.1.1 is-at 42:00:aa:00:00:03, length 28
+14:40:21.665376 ARP, Reply 172.16.3.3 is-at 42:00:aa:00:00:05, length 28
+14:41:28.225456 IP6 fe80::cfd:c6ff:fece:ca0c > ff02::2: ICMP6, router solicitation, length 16
+
+
+PC 2:
+
+tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
+listening on eth0, link-type EN10MB (Ethernet), capture size 262144 bytes
+14:40:16.534541 IP 172.16.1.1 > 172.16.3.3: ICMP echo request, id 3, seq 1, length 64
+14:40:16.534566 IP 172.16.3.3 > 172.16.1.1: ICMP echo reply, id 3, seq 1, length 64
+14:40:21.665200 ARP, Request who-has 172.16.1.1 tell 172.16.3.3, length 28
+14:40:21.665300 ARP, Request who-has 172.16.3.3 tell 172.16.1.1, length 28
+14:40:21.665336 ARP, Reply 172.16.3.3 is-at 42:00:aa:00:00:05, length 28
+14:40:21.665371 ARP, Reply 172.16.1.1 is-at 42:00:aa:00:00:03, length 28
+
+
+
+Terminal HOST :
+
+[solar@salle229-06 TP20]$ sudo himage pc1 ping -c1 172.16.3.3
+PING 172.16.3.3 (172.16.3.3) 56(84) bytes of data.
+64 bytes from 172.16.3.3: icmp_seq=1 ttl=64 time=0.109 ms
+
+--- 172.16.3.3 ping statistics ---
+1 packets transmitted, 1 received, 0% packet loss, time 0ms
+rtt min/avg/max/mdev = 0.109/0.109/0.109/0.000 ms
diff --git a/SCR2.2/TP20/tp20.SCR.2.2.pdf b/SCR2.2/TP20/tp20.SCR.2.2.pdf
new file mode 100644
index 0000000..db76599
Binary files /dev/null and b/SCR2.2/TP20/tp20.SCR.2.2.pdf differ
diff --git a/SCR2.2/TP21.tar b/SCR2.2/TP21.tar
new file mode 100644
index 0000000..11834d0
Binary files /dev/null and b/SCR2.2/TP21.tar differ
diff --git a/SCR2.2/TP21/tp21.SCR.2.2.imn b/SCR2.2/TP21/tp21.SCR.2.2.imn
new file mode 100644
index 0000000..2a5e451
--- /dev/null
+++ b/SCR2.2/TP21/tp21.SCR.2.2.imn
@@ -0,0 +1,638 @@
+node n2 {
+    type lanswitch
+    network-config {
+	hostname switch3
+	!
+    }
+    canvas c0
+    iconcoords {96 528}
+    labelcoords {97 556}
+    interface-peer {e0 n10}
+    interface-peer {e1 n19}
+    interface-peer {e2 n0}
+}
+
+node n3 {
+    type lanswitch
+    network-config {
+	hostname switch4
+	!
+    }
+    canvas c0
+    iconcoords {120 72}
+    labelcoords {75 55}
+    interface-peer {e0 n10}
+    interface-peer {e1 n11}
+    interface-peer {e2 n20}
+}
+
+node n4 {
+    type lanswitch
+    network-config {
+	hostname switch5
+	!
+    }
+    canvas c0
+    iconcoords {360 288}
+    labelcoords {341 309}
+    interface-peer {e0 n9}
+    interface-peer {e1 n11}
+    interface-peer {e2 n21}
+    interface-peer {e3 n1}
+}
+
+node n5 {
+    type lanswitch
+    network-config {
+	hostname switch6
+	!
+    }
+    canvas c0
+    iconcoords {816 48}
+    labelcoords {765 27}
+    interface-peer {e0 n9}
+    interface-peer {e1 n22}
+}
+
+node n6 {
+    type lanswitch
+    network-config {
+	hostname switch7
+	!
+    }
+    canvas c0
+    iconcoords {816 264}
+    labelcoords {810 232}
+    interface-peer {e0 n9}
+    interface-peer {e1 n12}
+    interface-peer {e2 n23}
+    interface-peer {e3 n8}
+}
+
+node n7 {
+    type lanswitch
+    network-config {
+	hostname switch8
+	!
+    }
+    canvas c0
+    iconcoords {528 312}
+    labelcoords {513 289}
+    interface-peer {e0 n12}
+    interface-peer {e1 n13}
+    interface-peer {e2 n14}
+}
+
+node n9 {
+    type host
+    network-config {
+	hostname P5
+	!
+	interface eth3
+	 mac address 42:00:aa:00:00:09
+	 ip address 10.80.0.254/17
+	!
+	interface eth2
+	 mac address 42:00:aa:00:00:04
+	 ip address 10.64.0.254/17
+	!
+	interface eth1
+	 mac address 42:00:aa:00:00:03
+	 ip address 10.48.0.254/17
+	!
+	interface lo0
+	 type lo
+	 ip address 127.0.0.1/8
+	 ipv6 address ::1/128
+	!
+	!
+    }
+    canvas c0
+    iconcoords {576 96}
+    labelcoords {543 52}
+    interface-peer {eth1 n4}
+    interface-peer {eth2 n5}
+    interface-peer {eth3 n6}
+    custom-configs {
+        custom-config-id default {
+            custom-command /bin/sh
+            config {
+                ip addr add 127.0.0.1/8 dev lo0
+                
+                ip addr add 10.48.0.254/17 dev eth1
+                ip addr add 10.64.0.254/17 dev eth2
+                ip addr add 10.80.0.254/17 dev eth3
+                ip -6 addr add ::1/128 dev lo0
+                
+                
+                iptables -t nat -A POSTROUTING -o eth3 -s 10.48.0.0/17 -j SNAT --to-source 10.80.0.254
+                
+                rpcbind
+                inetd
+                
+            }
+        }
+    }
+    custom-enabled true
+    custom-selected default
+}
+
+node n10 {
+    type host
+    network-config {
+	hostname P3
+	!
+	interface eth1
+	 mac address 42:00:aa:00:00:06
+	 ip address 10.32.0.254/17
+	!
+	interface eth0
+	 mac address 42:00:aa:00:00:05
+	 ip address 10.16.0.254/17
+	!
+	interface lo0
+	 type lo
+	 ip address 127.0.0.1/8
+	 ipv6 address ::1/128
+	!
+	!
+    }
+    canvas c0
+    iconcoords {240 288}
+    labelcoords {246 328}
+    interface-peer {eth0 n2}
+    interface-peer {eth1 n3}
+}
+
+node n11 {
+    type host
+    network-config {
+	hostname P4
+	!
+	interface eth1
+	 mac address 42:00:aa:00:00:08
+	 ip address 10.48.0.255/17
+	!
+	interface eth0
+	 mac address 42:00:aa:00:00:07
+	 ip address 10.32.0.255/17
+	!
+	interface lo0
+	 type lo
+	 ip address 127.0.0.1/8
+	 ipv6 address ::1/128
+	!
+	!
+    }
+    canvas c0
+    iconcoords {312 96}
+    labelcoords {319 52}
+    interface-peer {eth0 n3}
+    interface-peer {eth1 n4}
+    custom-configs {
+        custom-config-id default {
+            custom-command /bin/sh
+            config {
+                ip addr add 127.0.0.1/8 dev lo0
+                ip addr add 10.32.0.255/17 dev eth0
+                ip addr add 10.48.0.255/17 dev eth1
+                ip -6 addr add ::1/128 dev lo0
+                
+                
+                iptables -t nat -A POSTROUTING -o eth0 -j SNAT --to-source 10.32.0.255
+                iptables -t nat -A POSTROUTING -o eth1 -j SNAT --to-source 10.48.0.255
+                
+                rpcbind
+                inetd
+                
+            }
+        }
+    }
+    custom-enabled true
+    custom-selected default
+}
+
+node n12 {
+    type host
+    network-config {
+	hostname P6
+	!
+	interface eth0
+	 mac address 42:00:aa:00:00:0a
+	 ip address 10.80.0.255/17
+	!
+	interface eth1
+	 mac address 42:00:aa:00:00:0b
+	 ip address 102.103.104.255/15
+	!
+	interface lo0
+	 type lo
+	 ip address 127.0.0.1/8
+	 ipv6 address ::1/128
+	!
+	!
+	!
+    }
+    canvas c0
+    iconcoords {792 456}
+    labelcoords {751 479}
+    interface-peer {eth0 n6}
+    interface-peer {eth1 n7}
+    custom-configs {
+        custom-config-id default {
+            custom-command /bin/sh
+            config {
+                ip addr add 127.0.0.1/8 dev lo0
+                ip addr add 10.80.0.255/17 dev eth0
+                ip addr add 102.103.104.255/15 dev eth1
+                ip -6 addr add ::1/128 dev lo0
+                
+                
+                iptables -t nat -A POSTROUTING -o eth1 -j SNAT --to-source 102.103.104.255
+                
+                rpcbind
+                inetd
+                
+            }
+        }
+    }
+    custom-enabled true
+    custom-selected default
+}
+
+node n13 {
+    type router
+    model quagga
+    network-config {
+	hostname router1
+	!
+	interface eth1
+	 mac address 42:00:aa:00:00:0e
+	 ip address 202.203.204.254/11
+	!
+	interface eth0
+	 mac address 42:00:aa:00:00:0c
+	 ip address 102.103.104.254/15
+	!
+	interface lo0
+	 type lo
+	 ip address 127.0.0.1/8
+	 ipv6 address ::1/128
+	!
+	router rip
+	 redistribute static
+	 redistribute connected
+	 redistribute ospf
+	 network 0.0.0.0/0
+	!
+	router ripng
+	 redistribute static
+	 redistribute connected
+	 redistribute ospf6
+	 network ::/0
+	!
+    }
+    canvas c0
+    iconcoords {792 576}
+    labelcoords {792 601}
+    interface-peer {eth0 n7}
+    interface-peer {eth1 n15}
+}
+
+node n14 {
+    type host
+    network-config {
+	hostname host2
+	!
+	interface eth0
+	 mac address 42:00:aa:00:00:0d
+	 ip address 102.103.104.104/15
+	!
+	interface lo0
+	 type lo
+	 ip address 127.0.0.1/8
+	 ipv6 address ::1/128
+	!
+	!
+    }
+    canvas c0
+    iconcoords {384 456}
+    labelcoords {369 415}
+    interface-peer {eth0 n7}
+}
+
+node n15 {
+    type host
+    network-config {
+	hostname host3
+	!
+	interface eth0
+	 mac address 42:00:aa:00:00:0f
+	 ip address 202.203.204.204/11
+	!
+	interface lo0
+	 type lo
+	 ip address 127.0.0.1/8
+	 ipv6 address ::1/128
+	!
+	!
+	!
+    }
+    canvas c0
+    iconcoords {408 552}
+    labelcoords {408 588}
+    interface-peer {eth0 n13}
+}
+
+node n19 {
+    type pc
+    network-config {
+	hostname pc3
+	!
+	interface eth0
+	 mac address 42:00:aa:00:00:13
+	 ip address 10.16.0.3/17
+	!
+	interface lo0
+	 type lo
+	 ip address 127.0.0.1/8
+	 ipv6 address ::1/128
+	!
+	!
+    }
+    canvas c0
+    iconcoords {264 432}
+    labelcoords {264 463}
+    interface-peer {eth0 n2}
+}
+
+node n20 {
+    type pc
+    network-config {
+	hostname pc4
+	!
+	interface eth0
+	 mac address 42:00:aa:00:00:14
+	 ip address 10.32.0.4/17
+	!
+	interface lo0
+	 type lo
+	 ip address 127.0.0.1/8
+	 ipv6 address ::1/128
+	!
+	!
+    }
+    canvas c0
+    iconcoords {48 264}
+    labelcoords {48 295}
+    interface-peer {eth0 n3}
+}
+
+node n21 {
+    type pc
+    network-config {
+	hostname pc5
+	!
+	interface eth0
+	 mac address 42:00:aa:00:00:15
+	 ip address 10.48.0.5/17
+	!
+	interface lo0
+	 type lo
+	 ip address 127.0.0.1/8
+	 ipv6 address ::1/128
+	!
+	!
+    }
+    canvas c0
+    iconcoords {528 216}
+    labelcoords {528 247}
+    interface-peer {eth0 n4}
+}
+
+node n22 {
+    type pc
+    network-config {
+	hostname pc6
+	!
+	interface eth0
+	 mac address 42:00:aa:00:00:16
+	 ip address 10.64.0.6/17
+	!
+	interface lo0
+	 type lo
+	 ip address 127.0.0.1/8
+	 ipv6 address ::1/128
+	!
+	!
+    }
+    canvas c0
+    iconcoords {768 144}
+    labelcoords {768 175}
+    interface-peer {eth0 n5}
+}
+
+node n23 {
+    type pc
+    network-config {
+	hostname pc7
+	!
+	interface eth0
+	 mac address 42:00:aa:00:00:17
+	 ip address 10.80.0.7/17
+	!
+	interface lo0
+	 type lo
+	 ip address 127.0.0.1/8
+	 ipv6 address ::1/128
+	!
+	!
+    }
+    canvas c0
+    iconcoords {624 216}
+    labelcoords {624 247}
+    interface-peer {eth0 n6}
+}
+
+node n0 {
+    type host
+    network-config {
+	hostname host1
+	!
+	interface eth0
+	 mac address 42:00:aa:00:00:00
+	 ip address 10.16.0.200/17
+	!
+	interface lo0
+	 type lo
+	 ip address 127.0.0.1/8
+	 ipv6 address ::1/128
+	!
+	!
+    }
+    canvas c0
+    iconcoords {48 360}
+    labelcoords {31 327}
+    interface-peer {eth0 n2}
+}
+
+node n1 {
+    type pc
+    network-config {
+	hostname pc6-5
+	!
+	interface eth0
+	 mac address 42:00:aa:00:00:01
+	 ip address 10.48.0.6/17
+	!
+	interface lo0
+	 type lo
+	 ip address 127.0.0.1/8
+	 ipv6 address ::1/128
+	!
+    }
+    canvas c0
+    iconcoords {456 72}
+    labelcoords {429 41}
+    interface-peer {eth0 n4}
+}
+
+node n8 {
+    type pc
+    network-config {
+	hostname pc8
+	!
+	interface eth0
+	 mac address 42:00:aa:00:00:02
+	 ip address 10.80.0.8/17
+	!
+	interface lo0
+	 type lo
+	 ip address 127.0.0.1/8
+	 ipv6 address ::1/128
+	!
+    }
+    canvas c0
+    iconcoords {648 288}
+    labelcoords {648 319}
+    interface-peer {eth0 n6}
+}
+
+link l3 {
+    nodes {n9 n4}
+    bandwidth 0
+}
+
+link l4 {
+    nodes {n5 n9}
+    bandwidth 0
+}
+
+link l5 {
+    nodes {n10 n2}
+    bandwidth 0
+}
+
+link l6 {
+    nodes {n3 n10}
+    bandwidth 0
+}
+
+link l7 {
+    nodes {n11 n3}
+    bandwidth 0
+}
+
+link l8 {
+    nodes {n4 n11}
+    bandwidth 0
+}
+
+link l9 {
+    nodes {n6 n9}
+    bandwidth 0
+}
+
+link l10 {
+    nodes {n6 n12}
+    bandwidth 0
+}
+
+link l11 {
+    nodes {n7 n12}
+    bandwidth 0
+}
+
+link l12 {
+    nodes {n13 n7}
+    bandwidth 0
+}
+
+link l13 {
+    nodes {n7 n14}
+    bandwidth 0
+}
+
+link l14 {
+    nodes {n15 n13}
+    bandwidth 0
+}
+
+link l18 {
+    nodes {n19 n2}
+    bandwidth 0
+}
+
+link l19 {
+    nodes {n20 n3}
+    bandwidth 0
+}
+
+link l20 {
+    nodes {n4 n21}
+    bandwidth 0
+}
+
+link l21 {
+    nodes {n5 n22}
+    bandwidth 0
+}
+
+link l22 {
+    nodes {n6 n23}
+    bandwidth 0
+}
+
+link l0 {
+    nodes {n2 n0}
+    bandwidth 0
+}
+
+link l1 {
+    nodes {n1 n4}
+    bandwidth 0
+}
+
+link l2 {
+    nodes {n6 n8}
+    bandwidth 0
+}
+
+canvas c0 {
+    name {Canvas0}
+}
+
+option show {
+    interface_names yes
+    ip_addresses yes
+    ipv6_addresses yes
+    node_labels yes
+    link_labels yes
+    background_images no
+    annotations yes
+    hostsAutoAssign no
+    grid yes
+    iconSize normal
+    zoom 1.0
+}
+
diff --git a/SCR2.2/TP21/tp21.SCR.2.2.pdf b/SCR2.2/TP21/tp21.SCR.2.2.pdf
new file mode 100644
index 0000000..cfae7ea
Binary files /dev/null and b/SCR2.2/TP21/tp21.SCR.2.2.pdf differ