R1 :-
interface FastEthernet0/0
description ”
Connected to R2 “
Connected to R2 “
ip address
12.12.12.1 255.255.255.0
12.12.12.1 255.255.255.0
no shut
interface FastEthernet2/0
description ” Connected to PC1 “
ip address
10.1.1.1 255.255.255.0
10.1.1.1 255.255.255.0
no shut
router bgp 1
no synchronization
bgp
log-neighbor-changes
log-neighbor-changes
network 10.1.1.0
mask 255.255.255.0
mask 255.255.255.0
neighbor
12.12.12.2 remote-as 2
12.12.12.2 remote-as 2
no auto-summary
ip route 143.20.1.0 255.255.255.0 12.12.12.2
R2 :-
interface FastEthernet0/0
description ”
Connected to R1 “
Connected to R1 “
ip address
12.12.12.2 255.255.255.0
12.12.12.2 255.255.255.0
ip nat inside
no shut
interface FastEthernet0/1
description ”
Connected to R3 “
Connected to R3 “
ip address
23.23.23.2 255.255.255.0
23.23.23.2 255.255.255.0
ip nat outside
no shut
router bgp 2
no synchronization
bgp
log-neighbor-changes
log-neighbor-changes
network 143.20.1.0
mask 255.255.255.0
mask 255.255.255.0
neighbor
12.12.12.1 remote-as 1
12.12.12.1 remote-as 1
neighbor
23.23.23.3 remote-as 3
23.23.23.3 remote-as 3
no auto-summary
ip nat pool Pulic_pool_143.20.1.x 143.20.1.1 143.20.1.255
netmask 255.255.255.0 type match-host
netmask 255.255.255.0 type match-host
ip nat outside source list R3_Subnets pool
Pulic_pool_143.20.1.x
Pulic_pool_143.20.1.x
ip access-list standard R3_Subnets
permit 20.1.1.0
0.0.0.255
0.0.0.255
ip route 143.20.1.0 255.255.255.0 23.23.23.3
R3 :-
interface FastEthernet0/1
description ”
Connected to R2 “
Connected to R2 “
ip address
23.23.23.3 255.255.255.0
23.23.23.3 255.255.255.0
no shut
interface FastEthernet2/0
description ”
Connected to PC2 “
Connected to PC2 “
ip address
20.1.1.1 255.255.255.0
20.1.1.1 255.255.255.0
no shut
router bgp 3
no synchronization
bgp
log-neighbor-changes
log-neighbor-changes
neighbor
23.23.23.2 remote-as 2
23.23.23.2 remote-as 2
no auto-summary
PC1:-
PC1> show ip
NAME :
PC1[1]
PC1[1]
IP/MASK :
10.1.1.10/24
10.1.1.10/24
GATEWAY :
10.1.1.1
10.1.1.1
DNS :
MAC :
00:50:79:66:68:00
00:50:79:66:68:00
LPORT : 10007
RHOST:PORT :
127.0.0.1:10006
127.0.0.1:10006
MTU: : 1500
PC2:-
PC2> sh ip
NAME :
PC2[1]
PC2[1]
IP/MASK :
20.1.1.10/24
20.1.1.10/24
GATEWAY :
20.1.1.1
20.1.1.1
DNS :
MAC :
00:50:79:66:68:01
00:50:79:66:68:01
LPORT : 10001
RHOST:PORT :
127.0.0.1:10000
127.0.0.1:10000
MTU: : 1500
Verification:-
R1:-
R1#sh ip route
Codes: L – local, C – connected, S – static, R – RIP, M –
mobile, B – BGP
mobile, B – BGP
D – EIGRP, EX – EIGRP external, O – OSPF,
IA – OSPF inter area
IA – OSPF inter area
N1 – OSPF
NSSA external type 1, N2 – OSPF NSSA external type 2
NSSA external type 1, N2 – OSPF NSSA external type 2
E1 – OSPF
external type 1, E2 – OSPF external type 2
external type 1, E2 – OSPF external type 2
i – IS-IS,
su – IS-IS summary, L1 – IS-IS level-1, L2 – IS-IS level-2
su – IS-IS summary, L1 – IS-IS level-1, L2 – IS-IS level-2
ia – IS-IS
inter area, * – candidate default, U – per-user static route
inter area, * – candidate default, U – per-user static route
o – ODR, P –
periodic downloaded static route, H – NHRP
periodic downloaded static route, H – NHRP
+ –
replicated route, % – next hop override
replicated route, % – next hop override
Gateway of last resort is not set
10.0.0.0/8 is
variably subnetted, 2 subnets, 2 masks
variably subnetted, 2 subnets, 2 masks
C
10.1.1.0/24 is directly connected, FastEthernet2/0
10.1.1.0/24 is directly connected, FastEthernet2/0
L
10.1.1.1/32 is directly connected, FastEthernet2/0
10.1.1.1/32 is directly connected, FastEthernet2/0
12.0.0.0/8 is
variably subnetted, 2 subnets, 2 masks
variably subnetted, 2 subnets, 2 masks
C 12.12.12.0/24
is directly connected, FastEthernet0/0
is directly connected, FastEthernet0/0
L
12.12.12.1/32 is directly connected, FastEthernet0/0
12.12.12.1/32 is directly connected, FastEthernet0/0
143.20.0.0/24
is subnetted, 1 subnets
is subnetted, 1 subnets
S 143.20.1.0
[1/0] via 12.12.12.2
[1/0] via 12.12.12.2
143.30.0.0/24
is subnetted, 1 subnets
is subnetted, 1 subnets
S 143.30.1.0
[1/0] via 12.12.12.2
[1/0] via 12.12.12.2
R1#sh ip bgp summ
BGP router identifier 12.12.12.1, local AS number 1
BGP table version is 15, main routing table version 15
2 network entries using 256 bytes of memory
2 path entries using 104 bytes of memory
2/2 BGP path/bestpath attribute entries using 248 bytes
of memory
of memory
1 BGP AS-PATH entries using 24 bytes of memory
0 BGP route-map cache entries using 0 bytes of memory
0 BGP filter-list cache entries using 0 bytes of memory
BGP using 632 total bytes of memory
BGP activity 6/4 prefixes, 7/5 paths, scan interval 60
secs
secs
Neighbor
V AS MsgRcvd
MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
V AS MsgRcvd
MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
12.12.12.2
4 2 183
179 15 0
0 02:38:24 1
4 2 183
179 15 0
0 02:38:24 1
R2:-
R2#sh ip nat translations
Pro Inside global
Inside local Outside
local Outside global
Inside local Outside
local Outside global
— —
— 143.20.1.10
20.1.1.10 –<<<
Destination NAT
— 143.20.1.10
20.1.1.10 –<<<
Destination NAT
icmp 10.1.1.10:57480
10.1.1.10:57480
143.20.1.10:57480 20.1.1.10:57480
10.1.1.10:57480
143.20.1.10:57480 20.1.1.10:57480
icmp 10.1.1.10:57992
10.1.1.10:57992
143.20.1.10:57992 20.1.1.10:57992
10.1.1.10:57992
143.20.1.10:57992 20.1.1.10:57992
icmp 10.1.1.10:58504
10.1.1.10:58504
143.20.1.10:58504 20.1.1.10:58504
10.1.1.10:58504
143.20.1.10:58504 20.1.1.10:58504
icmp 10.1.1.10:58760
10.1.1.10:58760
143.20.1.10:58760 20.1.1.10:58760
10.1.1.10:58760
143.20.1.10:58760 20.1.1.10:58760
icmp 10.1.1.10:59016
10.1.1.10:59016 143.20.1.10:59016 20.1.1.10:59016
10.1.1.10:59016 143.20.1.10:59016 20.1.1.10:59016
icmp 10.1.1.10:59272
10.1.1.10:59272
143.20.1.10:59272 20.1.1.10:59272
10.1.1.10:59272
143.20.1.10:59272 20.1.1.10:59272
R2#sh ip nat translations
Pro Inside global
Inside local Outside
local Outside global
Inside local Outside
local Outside global
— —
—
143.20.1.10 20.1.1.10
—
143.20.1.10 20.1.1.10
icmp 10.1.1.10:8074
10.1.1.10:8074
143.20.1.10:8074 20.1.1.10:8074
10.1.1.10:8074
143.20.1.10:8074 20.1.1.10:8074
R2#sh ip nat translations verbose
Pro Inside global
Inside local Outside
local Outside global
Inside local Outside
local Outside global
— —
—
143.20.1.10 20.1.1.10
—
143.20.1.10 20.1.1.10
create
00:06:23, use 00:01:03, left 23:58:56, Map-Id (Out): 1,
00:06:23, use 00:01:03, left 23:58:56, Map-Id (Out): 1,
flags:
outside, use_count: 0, entry-id: 558, lc_entries: 0
R3#sh ip bgp summary
BGP router identifier 23.23.23.3, local AS number 3
BGP table version is 13, main routing table version 13
2 network entries using 256 bytes of memory
2 path entries using 104 bytes of memory
2/2 BGP path/bestpath attribute entries using 248 bytes
of memory
of memory
2 BGP AS-PATH entries using 48 bytes of memory
0 BGP route-map cache entries using 0 bytes of memory
0 BGP filter-list cache entries using 0 bytes of memory
BGP using 656 total bytes of memory
BGP activity 6/4 prefixes, 7/5 paths, scan interval 60
secs
secs
Neighbor
V AS MsgRcvd
MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
V AS MsgRcvd
MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
23.23.23.2
4 2 170
165 13 0
0 02:26:36 2
4 2 170
165 13 0
0 02:26:36 2
R3#sh ip route
Codes: L – local, C – connected, S – static, R – RIP, M –
mobile, B – BGP
mobile, B – BGP
D – EIGRP,
EX – EIGRP external, O – OSPF, IA – OSPF inter area
EX – EIGRP external, O – OSPF, IA – OSPF inter area
N1 – OSPF
NSSA external type 1, N2 – OSPF NSSA external type 2
NSSA external type 1, N2 – OSPF NSSA external type 2
E1 – OSPF
external type 1, E2 – OSPF external type 2
external type 1, E2 – OSPF external type 2
i – IS-IS,
su – IS-IS summary, L1 – IS-IS level-1, L2 – IS-IS level-2
su – IS-IS summary, L1 – IS-IS level-1, L2 – IS-IS level-2
ia – IS-IS
inter area, * – candidate default, U – per-user static route
inter area, * – candidate default, U – per-user static route
o – ODR, P –
periodic downloaded static route, H – NHRP
periodic downloaded static route, H – NHRP
+ –
replicated route, % – next hop override
replicated route, % – next hop override
Gateway of last resort is not set
10.0.0.0/24
is subnetted, 1 subnets
is subnetted, 1 subnets
B 10.1.1.0
[20/0] via 23.23.23.2, 02:09:41
[20/0] via 23.23.23.2, 02:09:41
20.0.0.0/8 is
variably subnetted, 2 subnets, 2 masks
variably subnetted, 2 subnets, 2 masks
C
20.1.1.0/24 is directly connected, FastEthernet2/0
20.1.1.0/24 is directly connected, FastEthernet2/0
L
20.1.1.1/32 is directly connected, FastEthernet2/0
20.1.1.1/32 is directly connected, FastEthernet2/0
23.0.0.0/8 is
variably subnetted, 2 subnets, 2 masks
variably subnetted, 2 subnets, 2 masks
C
23.23.23.0/24 is directly connected, FastEthernet0/1
23.23.23.0/24 is directly connected, FastEthernet0/1
L
23.23.23.3/32 is directly connected, FastEthernet0/1
23.23.23.3/32 is directly connected, FastEthernet0/1
143.20.0.0/24
is subnetted, 1 subnets
is subnetted, 1 subnets
B 143.20.1.0
[20/0] via 23.23.23.2, 02:07:49
[20/0] via 23.23.23.2, 02:07:49
R3#
PC1:-
PC1> ping 143.20.1.10
84 bytes from 143.20.1.10 icmp_seq=1 ttl=61 time=78.000
ms
ms
84 bytes from 143.20.1.10 icmp_seq=2 ttl=61 time=78.000
ms
ms
84 bytes from 143.20.1.10 icmp_seq=3 ttl=61 time=62.400
ms
ms
84 bytes from 143.20.1.10 icmp_seq=4 ttl=61 time=93.600
ms
ms
84 bytes from 143.20.1.10 icmp_seq=5 ttl=61 time=93.600
ms
ms
PC2:-
PC2> ping 10.1.1.10 -t
84 bytes from 10.1.1.10 icmp_seq=3 ttl=61 time=46.800 ms
84 bytes from 10.1.1.10 icmp_seq=4 ttl=61 time=78.000 ms
84 bytes from 10.1.1.10 icmp_seq=5 ttl=61 time=62.400 ms
84 bytes from 10.1.1.10 icmp_seq=6 ttl=61 time=78.000 ms
84 bytes from 10.1.1.10 icmp_seq=7 ttl=61 time=93.600 ms