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8.1 NAT Overview 8.2 NAT Configuration 8.3 Troubleshooting NAT
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CCNA NAT (Network Address Translation)
1.
Copyright © www.networkel.com 8-
NAT 8.1 NAT Overview 8.2 NAT Configuration 8.3 Troubleshooting NAT
2.
Copyright © www.networkel.com 8.1
NAT Overview
3.
Copyright © www.networkel.com WHATISNAT? •
Network Address Translation • Method of remapping one IP address space into another by modifying network address information in Internet Protocol (IP) datagram packet headers while they are in transit across a traffic routing device
4.
Copyright © www.networkel.com BONUSSLIDE(
PROMOTIONOFFER!) • To get our CCNA 200-125 Full Video Training with %90 discount click the link below now ! CCNA 200-125 VIDEO TRAINING (GET WITH %90 DISCOUNT)
5.
Copyright © www.networkel.com WHYWENEEDNAT? •
IPv4 address space is limited so each device can’t use a global address • Private IPv4 address range is not routed by internet routers so they need to be translated to global addresses • Mostly enabled on core routers
6.
Copyright © www.networkel.com IPv4PRIVATEADDRESSRANGE R1IPv4
Private Address Range IPv4 Public Address Range
7.
Copyright © www.networkel.com NATTERMINOLOGY •
Inside Local - Your host IP • Inside Global - Your public IP • Outside Local - Remote host IP • Outside Global - Remote public IP • Inside Local : 10.41.1.5 • Inside Global : 17.25.6.2 • Outside Local : 192.168.3.5 • Outside Global : 74.40.1.5 R1 SW1 Gig 0/0 PC1 R2 SW2 Gig 0/0 10.41.1.1 10.41.1.5 17.25.6.2 74.40.1.5 192.168.3.5 192.168.3.1
8.
Copyright © www.networkel.com NATTYPES •
Static NAT • Dynamic NAT • PAT
9.
Copyright © www.networkel.com STATICNAT •
Private addresses are matched with global addresses one to one R1 PC3 PC2 PC1 10.41.1.1 10.41.1.2 10.41.1.3 203.38.201.35 203.38.201.36 203.38.201.37 INSIDE LOCAL INSIDE GLOBAL 10.41.1.1 203.38.201.35 10.41.1.2 203.38.201.36 10.41.1.3 203.38.201.37 R1 NAT TABLE
10.
Copyright © www.networkel.com DYNAMICNAT •
Public IPv4 pool is configured on router • IP addresses are assigned with first come first served rule R1 PC3 PC2 PC1 10.41.1.1 10.41.1.2 10.41.1.3 ADDRESS POOL 203.38.201.35 203.38.201.36 203.38.201.37 203.38.201.38 203.38.201.39 . .
11.
Copyright © www.networkel.com PAT •
Port Address Translation • Each private address is translated to a single or a few public IPv4 address • Port addresses are used for choosing the right internal device when the packet is coming back R1 PC3 PC2 PC1 10.41.1.1 10.41.1.2 10.41.1.3 203.38.201.35
12.
Copyright © www.networkel.com 8.2
NAT Configuration
13.
Copyright © www.networkel.com STATICNATCONFIGURATION R1 PC3 PC2 PC1 10.41.1.1 10.41.1.2 10.41.1.3 203.38.201.35 203.38.201.36 203.38.201.37 Gig
0/0 Gig 0/1
14.
Copyright © www.networkel.com VERIFYINGSTATICNATCONFIGURATION R1 PC3 PC2 PC1 10.41.1.1 10.41.1.2 10.41.1.3 203.38.201.35 203.38.201.36 203.38.201.37 Gig
0/0 Gig 0/1
15.
Copyright © www.networkel.com DYNAMICNATCONFIGURATION R1 PC3 PC2 PC1 10.41.1.1 10.41.1.2 10.41.1.3 ADDRESS
POOL 203.38.201.35 203.38.201.36 203.38.201.37 203.38.201.38 Gig 0/0 Gig 0/1
16.
Copyright © www.networkel.com PATCONFIGURATION R1 PC3 PC2 PC1 10.41.1.1 10.41.1.2 10.41.1.3 203.38.201.35
17.
Copyright © www.networkel.com NATFORIPv6 •
IPv6 has a huge address space so there is no need for NAT for private -> public translation • Only used for communication between IPv4 and IPv6 (NAT-64) NAT 64 Router
18.
Copyright © www.networkel.com BONUSSLIDE(
PROMOTIONOFFER!) • To get our CCNA 200-125 Full Video Training with %90 discount click the link below now ! CCNA 200-125 VIDEO TRAINING (GET WITH %90 DISCOUNT)
Download now