NAT & PAT configuration on Cisco Packet tracer

Network Address Translation(NAT): 

  •  NAT is a process of changing one IP into another.
  •  NAT is used to save Public IP.
  •  It provides security.

 In other words NAT converts request from Private IP address to Public IP address and vice-verse. It helps in hiding the Private IP address of an organization by representing Public IP address as a source/destination.

Types of NAT
  • STATIC NAT(one-one mapping)
  • DYNAMIC NAT(many-many mapping)
  • PAT(many-one mapping)

STATIC NAT:

  • One Private IP address is mapped to one Public IP address.
  • Generally used for hosting public servers.
  • Configured for inbound traffic.
STEPS FOR CONFIGURING STATIC NAT IN CISCO ROUTER:

ISPRouter(config)#interface serial 0/0
ISPRouter(config-if)#ip address 11.0.0.2 255.0.0.0
ISPRouter(config-if)#no shutdown
ISPRouter(config-if)#encapsulation ppp
ISPRouter(config-if)#clock rate 64000
ISPRouter(config-if)#exit

ISPRouter(config)#interface fast Ethernet 0/0
ISPRouter(config-if)#ip address 10.0.0.1 255.0.0.0
ISPRouter(config-if)#no shutdown
ISPRouter(config)#ip route 0.0.0.0 0.0.0.0 s0/0
ISPRouter(config)#ip nat inside source static 10.0.0.2 11.0.0.2
ISPRouter(config)#interface serial 0/0
ISPRouter(config-if)#ip nat outside
ISPRouter(config-if)#exit
ISPRouter(config)#internet fast Ethernet 0/0
ISPRouter(config-if)#ip nat inside
ISPRouter(config-if)#exit

Port Address Translation(PAT):

  • Many Private IP address are mapped to one Public IP address.
  • All users can access internet at the same time.
  • Only configured for outbound traffic.

STEPS FOR CONFIGURING PAT IN CISCO ROUTER:
MYRouter(config)#internet serial 0/0
MYRouter(config-if)#ip ad 11.0.0.1 255.0.0.0
MYRouter(config-if)#no shutdown
MYRouter(config-if)#encapsulation ppp
MYRouter(config)#ip route 0.0.0.0 0.0.0.0 s0/0
MYRouter(config)#access-list 1 permit 192.168.1.0 0.0.0.255
MYRouter(config)#ip nat inside source list 1 int s0/0 overload



Video for the above configuration
http://youtu.be/igGz_zqdXZ0

Comments

Post a Comment

Popular posts from this blog

Reasoning-Number Series

Complete the following series 225,224,____,222,221 a)220         b)223         c)219           d)226 Answer: b)      2. 17,19,23,29,31,37,______     a)41               b)43         c)40           d)42    Answer: If you look at the above series they are all prime numbers, next series will be 41        3.225,196,169,____,121,100,81     a)156              b)144         c)136           d)125 Answer: above series can be written as 15^2,14^2,13^2,____,11^2,10^2,9^2. The missing series is 12^2=144.     4.12,14,15,16,18,20     a)22              b)25         c)21           d)23 Answer: consider above series into two alternate parts. Like 12,15,18,____ & 14,16,20. Then the difference of two alternate series as follows: 3,3,3___ & 2,4. Next series after 18 need to be added with 3= 18+3=21.     5.64,125,216,343,__     a)64              b)424         c)317           d)512 Answer: The above series can be written, 4^3,5^3,6^3,7^3, then the next
Read more

Reasoning-Letter Series

Question & Answers 46. abc-a--d-bcdabcd (1)d b b a        (2)d c a a        (3)a b c d     (4)d b c a 47.b-da-cda-c-abc (1)a a b b        (2)d b c a        (3)a d b c     (4)c b b d 48. a a a b -b c - - a a - (1)a b b c        (2)a c b c        (3)b a c a     (4)b c c a 49. -b a b - b c b c - c a - a b (1)a b c c         (2)a b c b        (3)a c a c     (4)a a c b 50.a b c - - c b a a - c d d c - a (1)d b d b        (2)d d b b         (3)b c a d     (4)a d b c 51.E, A _, O, I (1)E        (2)U        (3)X     (4)V 52.D , F ,G, H , J ,K , L, M , N __ (1)O        (2)Q        (3)P     (4)R 53.E, J, O , T, Y, ____ (1)D        (2)Z        (3)C     (4)E 54.G, J, N , Q, U, ____ (1)W        (2)X        (3)Y     (4)Z 55.R, K, F, C, ____ (1)Z        (2)Y        (3)W     (4)A 56. BY,CX,EV, GT, KP,____ (1)JQ        (2)MN        (3)PK     (4)LO 57.AI,EO,IU,__,UE (1)OU        (2)OI        (3)UA     (4)OA 58.AP, BQ, CR, DS, ____ (1)ET        (2)EU        (3
Read more

Profit and Loss

Cost Price (C.P.) The price at which an article is purchased or manufactured is called its cost price. Selling Price (S.P.) The price at which an article is sold, is called its selling price. Profit If the selling price of an article is greater than its cost price, we say that there is a profit or gain. Profit = Selling Price - Cost Price When S.P.>C.P. Profit = S.P. - C.P. S.P.= C.P.+Profit C.P.=S.P.-Profit Profit % = Profit/C.P. * 100 Profit = Profit % * C.P. When C.P.  and Profit% are given then, S.P. = C.P. * ((100+Profit %)/100) When S.P. and Profit % are given then C.P.= 100* S.P./100+ Profit % Loss If the selling price of an article is less than tits cost price, we say that there is a loss. Loss = Cost Price - Selling Price  When C.P.>S.P. Loss = C.P. - S.P. S.P.= C.P.-Loss C.P.=S.P.+Loss Loss % = Loss/C.P. * 100 Loss = Loss % * C.P. When C.P.  and Loss % are given then, S.P. = C.P. * ((100-Loss %)/100) When S.P. and Loss
Read more