Configuring ASA, Dynamic Inside NAT Translation Example

Configuring ASA, Dynamic Inside NAT Translation Example

ASA
Interface	E0/0	E0/1
IP Address /	10.1.1.2	192.168.1.1
Net mask	255.255.255.0	255.255.255.0
Router User1
Interface	E1/0
IP Address	192.168.1.2
Net mask	255.255.255.0
Router User2
Interface	E1/0
IP Address	192.168.1.3
Net mask	255.255.255.0
Router ISP
IP Address	10.1.1.1
Net mask	255.255.255.0

ciscoasa# show run

: Saved

:

ASA Version 8.0(2)

!

hostname ciscoasa

enable password 8Ry2YjIyt7RRXU24 encrypted

names

!

interface Ethernet0/0

 nameif outside

 security-level 0

 ip address 100.1.1.2 255.255.255.0

no shut

!

interface Ethernet0/1

 nameif inside

 security-level 100

 ip address 192.168.1.1 255.255.255.0

no shut

!

passwd 2KFQnbNIdI.2KYOU encrypted

ftp mode passive

pager lines 24

mtu outside 1500

mtu inside 1500

no failover

icmp unreachable rate-limit 1 burst-size 1

no asdm history enable

arp timeout 14400

global (outside) 1 100.1.1.10-100.1.1.50 netmask 255.255.255.0 (This command instruct the ASA to translate internal address to range of outside IP address )

nat (inside) 1 192.168.1.0 255.255.255.0 (This  command instruct the ASA to that this internal address has to translated )

route outside 0.0.0.0 0.0.0.0 10.1.1.1 (This command instruct the ASA to route traffic to ISP router)

timeout xlate 3:00:00

timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02

timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00

timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00

timeout uauth 0:05:00 absolute

dynamic-access-policy-record DfltAccessPolicy

no snmp-server location

no snmp-server contact

snmp-server enable traps snmp authentication linkup linkdown coldstart

no crypto isakmp nat-traversal

telnet timeout 5

ssh timeout 5

console timeout 0

threat-detection basic-threat

threat-detection statistics access-list

!

!

prompt hostname context

Cryptochecksum:00000000000000000000000000000000

: end

ciscoasa#

ISP Configuration

interface Ethernet1/0

 ip address 100.1.1.1 255.255.255.0

no shut

line vty 0 4

 password test

USER1  Configuration

interface Ethernet1/0

 ip address 192.168.1.2 255.255.255.0

 no shut

ip route 0.0.0.0 0.0.0.0 192.168.1.1

USER2 Configuration

interface Ethernet1/0

 ip address 192.168.1.3 255.255.255.0

no shut

 ip route 0.0.0.0 0.0.0.0 192.168.1.1

Now open telnet session from user1 router or user2 router to ISP router

User1#telnet  10.1.1.2

Verifying 

ciscoasa# show xlate