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Beginner

How to configure Dual ISP on Cisco router 2821

I've 3 interfaces on router:

Gb0/0-ISP01 with DHCP client

Gb0/1-ISP02 Static IP 192.168.2.x/24

Fa0/0 - LAN 192.168.1.1/24

I want to know, how to configure:
1. Set the IP of interface Gb0/0 as dhcp client from ISP01 and make it as default route.

2. How to configure the ip nat.....overload?

3. How to use the ip sla to monitor internet connectivity to 8.8.8.8 for ISP01, if it fails, to go to ISP02.
Regards!

3 REPLIES 3
VIP Expert

How to configure Dual ISP on Cisco router 2821

I want to know, how to configure:

1. Set the IP of interface Gb0/0 as dhcp client from ISP01 and make it as default route.

Config t

inter gi0/0

ip address dhcp

ip route 0.0.0.0 0.0.0.0 gigabitEthernet 0/0

2. How to configure the ip nat.....overload?

Here is a link on NAT config

http://www.cisco.com/en/US/tech/tk648/tk361/technologies_tech_note09186a0080094e77.shtml

Here is the config guide for IP SLA configs:

http://www.cisco.com/en/US/docs/ios/12_4/ip_sla/configuration/guide/sla_12_4_book.pdf

HTH

Beginner

How to configure Dual ISP on Cisco router 2821

i know how do to do nat (Static, dynamic, overload)

But i need to know how to do in this case, becase there are two OUTSIDE interface.

i've created this access list:

ip access-list extended ACL-NAT

permit ip 192.168.1.0 0.0.0.255 any

so i've to put these two commands:

ip nat source list ACL-NAT interface gi0/1 overload

ip nat source list ACL-NAT interface gi0/0 overload?

right?

Beginner

How to configure Dual ISP on Cisco router 2821

When i do that, on the Show run, i see only the command i enter for last, which is:

ip nat source list ACL-NAT interface gi0/0 overload

The other is not shown on the show run.

ip nat source list ACL-NAT interface gi0/1 overload

this is not displayed.

could this work, or not?

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