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Replies

Cisco 2911 ADSL NAT configuration - LoopBack/SVI question

whickwire
Level 1
Level 1

I am running into a problem with my NAT configuration on this router. I have successfully leased a connection from my ISP but am wondering about what the setup would look like if the ip address is negotiated. It's my understand and possibly the wrong one that I will need to possibly duo a policy map or create a loopback interface and reference the leased IP to make things work with my switching equipment. (This 2911 has old fw and doesn't support SVI's unfortunately)

 

Previously when I hooked up my router to a generic Cable connection that seemed relatively easy because the interface was actually receiving an address and then I just had to make a simple acl and overload.

 

Building configuration...


Current configuration : 1770 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname CoreRouter
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
dot11 syslog
!
!
ip cef
!
!
!
multilink bundle-name authenticated
!
!
voice-card 0
no dspfarm
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
username admin privilege 15 secret 5 $1$M6fZ$TDpU3j4kbBqI9ZE1Nrv9e0
archive
log config
hidekeys
!
!
!
!
!
!
!
!
interface FastEthernet0/0
description UPLINK to TEKSAVY
no ip address
ip nat outside
ip virtual-reassembly
duplex auto
speed auto
pppoe enable group global
pppoe-client dial-pool-number 1
no cdp enable
!
interface FastEthernet0/1
ip address 10.79.0.1 255.255.255.0
ip nat inside
ip virtual-reassembly
duplex auto
speed auto
!
interface Serial0/2/0
no ip address
shutdown
no fair-queue
clock rate 125000
!
interface Serial0/2/1
no ip address
shutdown
clock rate 125000
!
interface Dialer1
ip address negotiated
no ip proxy-arp
ip mtu 1492
ip virtual-reassembly
encapsulation ppp
ip tcp adjust-mss 1452
no ip mroute-cache
delay 50000
dialer pool 1
dialer-group 1
no cdp enable
ppp authentication chap pap callin
ppp chap hostname ymca79james@teksavvy.com
ppp chap password 0 ymca79Jame5
ppp pap sent-username ymca79james@teksavvy.com password 0 ymca79Jame5
ppp ipcp dns request accept
ppp ipcp address accept
!
ip forward-protocol nd
ip route 0.0.0.0 0.0.0.0 Dialer1
!
!
no ip http server
no ip http secure-server
ip nat inside source list 100 interface Dialer1 overload
!
access-list 100 permit ip 10.0.0.0 0.0.0.255 any
dialer-list 1 protocol ip permit
!
!
!
!
!
!
control-plane
!
!
!
!
!
!
!
!
!
!
line con 0
line aux 0
line vty 0 4
login
!
scheduler allocate 20000 1000
!
end

1 Accepted Solution

Accepted Solutions

Hello,

 

below is a way to do it (changes marked in bold). Make sure the uplink port on the switch is reverted back to a switchport.

 

Current configuration : 1770 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname CoreRouter
!
boot-start-marker
boot-end-marker
!
no aaa new-model
dot11 syslog
!
ip cef
!
multilink bundle-name authenticated
!
voice-card 0
no dspfarm
!
username admin privilege 15 secret 5 $1$M6fZ$TDpU3j4kbBqI9ZE1Nrv9e0
archive
log config
hidekeys
!
bridge irb
!
interface FastEthernet0/0
description UPLINK to TEKSAVY
no ip address
ip nat outside
ip virtual-reassembly
duplex auto
speed auto
pppoe enable group global
pppoe-client dial-pool-number 1
no cdp enable
!
interface FastEthernet0/1
no ip address
bridge-group 1
ip virtual-reassembly
duplex auto
speed auto
!
interface Serial0/2/0
no ip address
shutdown
no fair-queue
clock rate 125000
!
interface Serial0/2/1
no ip address
shutdown
clock rate 125000
!
interface BVI1
ip address 10.79.0.1 255.255.255.0
ip nat inside
!
interface Dialer1
ip address negotiated
no ip proxy-arp
ip mtu 1492
ip virtual-reassembly
encapsulation ppp
ip tcp adjust-mss 1452
no ip mroute-cache
delay 50000
dialer pool 1
dialer-group 1
no cdp enable
ppp authentication chap pap callin
ppp chap hostname ymca79james@teksavvy.com
ppp chap password 0 ymca79Jame5
ppp pap sent-username ymca79james@teksavvy.com password 0 ymca79Jame5
ppp ipcp dns request accept
ppp ipcp address accept
!
ip forward-protocol nd
ip route 0.0.0.0 0.0.0.0 Dialer1
!
no ip http server
no ip http secure-server
ip nat inside source list 100 interface Dialer1 overload
!
access-list 100 permit ip 10.0.0.0 0.0.0.255 any
dialer-list 1 protocol ip permit
!
control-plane
!

bridge 1 protocol ieee
bridge 1 route ip
line con 0
line aux 0
line vty 0 4
login
!
scheduler allocate 20000 1000
!
end