How to configure a Basic Internet Acces network?

[ald14win001]

Hello Everyone,

Just wanna ask if, what will I do to configure the following:

ISP Modem>>>>Cisco Router>>>>Cisco Switch1>>>>>Cisco Switch2>>>>Cisco Switch3>>>>Cisco Switch4

"I WILL NOT USE ANY VLAN"

ROUTER 2951

Gi0/0 ====>>>>> ISP Modem (IP Address: 111.209.86.194/27)

Gi0/1 ====>>>>> Cisco Switch1 2960 (IP Address: 10.0.10.1/23)

Switch1 2960

Fa0/0 ====>>>>> Router 2951 Gi0/0

(Remaining Ports for PC)

Switch2 2960

Fa0/0 ====>>>>> Switch1 2960 Fa0/1

(Remaining Ports for PC)

Switch3 2960

Fa0/0 ====>>>>> Switch2 2960 Fa0/1

(Remaining Ports for PC)

Switch4 2960

Fa0/0 ====>>>>> Switch3 2960 Fa0/1

(Remaining Ports for PC)

Thanks for answering.

[Krishan PalSingh]

Hello,

You dont need special configuration, all you need to setup is your router.

configure in this sequence,

1. IP Address Subnet Mask and Speed duplex on router

2. Configure Default route on router

3. Configure NAT on Router

4. Connect switches as mentioned in email, if you use straight cables you might need mdix auto command.

[ald14win001]

Hello Krishan,

Thanks for your response.

I have only done configuring the IP Address of the Interfaces.

What commands should I do next?

Command for Default Route and NAT.

"Sorry, I am just a Newbie in Cisco."

Thanks

[Krishan PalSingh · Accepted solution]

Please configure,

access-list 101 per ip 10.0.10.0 0.0.1.255 any
ip nat inside source list 101 interface Gi0/1 overload
int gi0/0
ip nat outside
int gi0/1
ip nat inside

ip route 0.0.0.0 0.0.0.0 "Ip address of your ISP gateway"

Please don't forget to mark this answered if this works for you.

[ald14win001]

Another Problem,

How about I have a second ISP Modem that I want to setup as my Backup connection.

 It will be Like this:

Router Gi0/0 =>>> ISP 1

Gi0/1=>>> LAN

Gi0/2=>>> ISP 2

What will be the Command that I will configure?

Thank You Very much. I just Need this for my small contact center business.

[Krishan PalSingh]

This will be slightly tricky to setup backup link.

Option 1 - Manual fail-over. i.e.. when your primary link goes down, you would need to either shutdown primary link or disconnect the cable for primary link.

Configure backup floating route and NAT, sample configuration

NAT

access-list 101 per ip 10.0.10.0 0.0.1.255 any
ip nat inside source list 101 interface Gi0/2 overload

Backup Route

ip route 0.0.0.0 0.0.0.0 "Ip address of your ISP gateway" 100

Now when you unplug primary cable or shutdown primary ISP link, traffic will automatically shift to backup ISP for internet access.

Option 2 - Auto Failover

======

Setup BGP with both ISP's with primary configured with weight and backup ISP with as-prepend. 

Setup NAT, and this rest BGP will take care

Option 3 - Auto failover

=======

Configure IP SLA based routing

Configure IP SLA track, attach this track with primary route. If primary route is down, track will reduce its priority and backup will be installed in routing table.