NATing with two Internet Connection

Answered Question
Nov 22nd, 2009

Hi ,

I need to configure Cisco 1841 which has two internet connection ( SDSL & ADSL2+) and want to distrubute traffic across  both links equally( Possiblly voice traffic to SDSL). One conection is already up and running and doing NAT  Overload  and now second connection need to be added to config.

Do I just need to add a one more default route towards the 2nd internet connection ( Dialer interface)? like 0.0.0.0 0.0.0.0. Dailer1

Here is the current config. ( only NAT config)

interface FastEthernet0/0
description *****LAN Connection to Switch*****
ip address 10.0.0.254 255.255.0.0
ip nat inside
ip virtual-reassembly
duplex auto

interface ATM0/0/0
no ip address
no atm ilmi-keepalive
!
interface ATM0/0/0.1 point-to-point
no snmp trap link-status
pvc 0/38
  encapsulation aal5mux ppp dialer
  dialer pool-member 1
!
interface Dialer0
ip address negotiated
ip nbar protocol-discovery
ip flow ingress
ip flow egress
ip nat outside
ip virtual-reassembly
encapsulation ppp
dialer pool 1
dialer-group 2

!
access list 5 10 permit 10.0.0.0 0.0.255.255

!
ip nat inside source list 5 interface Dialer0 overload

!
ip route 0.0.0.0 0.0.0.0 Dialer0

!


Any sample config will really help.

Regards

I have this problem too.
0 votes
Correct Answer by Jon Marshall about 7 years 1 week ago

s.nasheet wrote:

Hi ,

I need to configure Cisco 1841 which has two internet connection ( SDSL & ADSL2+) and want to distrubute traffic across  both links equally( Possiblly voice traffic to SDSL). One conection is already up and running and doing NAT  Overload  and now second connection need to be added to config.

Do I just need to add a one more default route towards the 2nd internet connection ( Dialer interface)? like 0.0.0.0 0.0.0.0. Dailer1

Here is the current config. ( only NAT config)

interface FastEthernet0/0
description *****LAN Connection to Switch*****
ip address 10.0.0.254 255.255.0.0
ip nat inside
ip virtual-reassembly
duplex auto

interface ATM0/0/0
no ip address
no atm ilmi-keepalive
!
interface ATM0/0/0.1 point-to-point
no snmp trap link-status
pvc 0/38
  encapsulation aal5mux ppp dialer
  dialer pool-member 1
!
interface Dialer0
ip address negotiated
ip nbar protocol-discovery
ip flow ingress
ip flow egress
ip nat outside
ip virtual-reassembly
encapsulation ppp
dialer pool 1
dialer-group 2

!
access list 5 10 permit 10.0.0.0 0.0.255.255

!
ip nat inside source list 5 interface Dialer0 overload

!
ip route 0.0.0.0 0.0.0.0 Dialer0

!


Any sample config will really help.

Regards

Yes, just add a second default route pointing out of Dialer1. Also make suer you configure a similiar NAT statement ie.

int dialer

ip nat outside


ip nat inside source list 5 interface Dialer1 overload

Jon

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Correct Answer
Jon Marshall Sun, 11/22/2009 - 15:43

s.nasheet wrote:

Hi ,

I need to configure Cisco 1841 which has two internet connection ( SDSL & ADSL2+) and want to distrubute traffic across  both links equally( Possiblly voice traffic to SDSL). One conection is already up and running and doing NAT  Overload  and now second connection need to be added to config.

Do I just need to add a one more default route towards the 2nd internet connection ( Dialer interface)? like 0.0.0.0 0.0.0.0. Dailer1

Here is the current config. ( only NAT config)

interface FastEthernet0/0
description *****LAN Connection to Switch*****
ip address 10.0.0.254 255.255.0.0
ip nat inside
ip virtual-reassembly
duplex auto

interface ATM0/0/0
no ip address
no atm ilmi-keepalive
!
interface ATM0/0/0.1 point-to-point
no snmp trap link-status
pvc 0/38
  encapsulation aal5mux ppp dialer
  dialer pool-member 1
!
interface Dialer0
ip address negotiated
ip nbar protocol-discovery
ip flow ingress
ip flow egress
ip nat outside
ip virtual-reassembly
encapsulation ppp
dialer pool 1
dialer-group 2

!
access list 5 10 permit 10.0.0.0 0.0.255.255

!
ip nat inside source list 5 interface Dialer0 overload

!
ip route 0.0.0.0 0.0.0.0 Dialer0

!


Any sample config will really help.

Regards

Yes, just add a second default route pointing out of Dialer1. Also make suer you configure a similiar NAT statement ie.

int dialer

ip nat outside


ip nat inside source list 5 interface Dialer1 overload

Jon

s.nasheet Sun, 11/22/2009 - 16:01

Many Thanks Jon. I will try that first thing Monday morning.

Regards

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