CISCO Router 2921/K9 Help!

[Luis Solis]

I'm new to CISCO Routers, we bought this unit as a recomendation from a CISCO representative to provide just internet service for our guests.I have tried to set it up using CISCO CP Express and was able to set up the LAN side but when it comes to the WAN it doesn't connect to the internet and I cannot find the field to setup the gateway provided by the ISP.

We have a cable modem with 5 static IP's, we have 2 in use and planning to use a 3rd one for this router, here's a sample of the info (not the real numbers) I have to set up:

*WAN

IP 24.182.198.23

Subnet  255.255.255.248

Gateway 24.182.198.22

DNS 24.205.192.61

DNS 24.205.224.16

*LAN

IP 172.16.0.1

Subnet 255.255.252.0

DHCP pool 172.16.0.40  172.16.3.254

[mavespig]

Hi Luis,

would it be possible to connect to the router via console cable, and collect a 'show run'?

If you are not familiar with CLI:

Router>

Router> enable

Router# show run

Building configuration...

If I understand correctly, you use a cable modem for connectivity, and the router is connected behind it, is that right?

2921 ----- CM ----- internet

Which type of connection do you have between 2921 and cable modem? Is that Ethernet?

Cheers

Marco

[cadet alain]

Hi,

for the default gateway: 

router(config)# ip route 0.0.0.0 0.0.0.0 < IP address of Modem interface connected to router>

for the WAN  IP:

router(config)# interface fx/x

   ip address 24.182.198.23 255.255.255.248

   no shutdown

for  the DHCP:

ip dhcp excluded-address 172.16.0.1 172.16.0.39

ip dhcp pool MYPOOL

network 172.16.0.0 255.255.252.0

default-router 172.16.0.1

dns-server 24.205.192.61 24.205.224.16

You'll have to configure NAT for machines on the LAN to go to the internet:

access-list 99 permit 172.16.0.0  0.0.3.255

ip nat inside source list 99 interface fx/x

under LAN interface: ip nat inside

under WAN interface: ip nat outside

Regards.

Alain

[Latchum Naidu]

Hi Luis,

To get internet access to your LAN (guests), you need to do some configuration manually.

First configure the WAN interface (whcih connected to your ISP router/modem)
All the below config will be done from router config mode Router(cofnig)#

int gi0/0
ip address 24.182.198.23 255.255.255.248
ip nat outside
no shut

Now config your LAN interface:

int gi0/1
ip address "your LAN ip"
ip nat inside
no shut

Configure your dns servers:

ip name-server 24.205.192.61
ip name-server 24.205.224.16

Configure default router pointing to your ISP gateway:

ip route 0.0.0.0 0.0.0.0 24.182.198.22

Configure NAT in order to get your all local private ip rage to get access to internet with single IP as you have:

ip nat inside source route-map nonat interface gig0/0 overload

route-map nonat permit 10
match ip address NONAT

ip access-list extended NONAT
permit ip 172.16.0.0 0.0.0.255 any

Hope the above helps you to achieve your task...

Please rate the helpfull posts.
Regards,
Naidu.

[Luis Solis]

Naidu

First of all thanks for your help

I have a problem in the last line: permit ip 172.0.0.0 0.0.0.255 any . It gives me an %invalid input detected at ^ marker.

Thanks

[Latchum Naidu]

Hi Luis,

You have to apply the below commands in your router global configuration mode which looks like below...

Router(config)#
ip access-list extended NONAT
permit ip 172.16.0.0 0.0.0.255 any

Let me know if you have any troubles.

Please rate the helpfull posts.
Regards,
Naidu.