Click Next to begin the

Express Wizard Setup

Enter the customers local domain name

Pick a name for the router

Set the username Se the password to whatever you want

Make this the same as the above

password

Click next

Configure the IP address of the inside interface and set its

subnet mask.

Make sure you think about this carefully. It can be a lot of work to

change this address later due to the complexity of

access lists.

Click Next

If you want the router to act as a DHCP server, fill

out this section.

Don’t forget to fill out the DNS section.

Click next

Cisco 831 Router SDM Express

• For customers with a static IP address from Comcast or Verizon the setup should look like this

Set the Address Type to Static

Enter their static address

Don’t forget the correct subnet

mask

Click Next

Make the Default Route the Gateway Address

given by the ISP

Make sure NAT is Enabled

Click Next

Click here to enable PPoE

Make sure the Address Type is

set to IP Negotiated (NOT

DHCP)

For Verizon use CHAP Enter the

verizon PPoE

username and

password

Click Next

The default route is the interface for Verizon PPoE

Make sure NAT is Enabled

Click Next

Cisco 831 Router SDM Express

• For customers with a Dynamic IP address from some other ISP or with an ordinary Comcast Cable modem (not a SMC) the setup should look like this

• This is really not a very common setup

Set the address type to Dynamic

Click Next

Make sure NAT is enabled

Click Next

Cisco 831 Router SDM Express

• Now back to the settings common to all setups

Make sure you turn on the firewall. Things will not work

correctly without it.

Click Next

Make sure allThe options are

selected

Click Next

Click Finish

Click OKIf you are using a PPoE

DSL connection or another type that has a

Dynamic IP address, you have to answer YES!

This window will open and the OK will be

grayed out. DO NOT CLOSE ANYTHING! Wait for the OK to be

clickable.

Cisco 831 Router SDM Express

• After Clicking OK the SDM Express wizard will close and the router will begin a reboot.

• The reboot will take more than 60 seconds to complete.

• DO NOT INTERUPT IT. Wait for it to fully reboot and load.

• When it is done, you can load and access the SDM Express again at the new IP address.

If something goes wrong and you need to start over, Reset

to Factory Defaults

If you have installed the SDM locally from CD, you can click

her to open it

Cisco 831 Router SDM Express

• You should now have access to the Internet.• To configure open ports, we need to use the

SDM.• It can be downloaded from Cisco or Installed

from CDROM.• It also requires Java and Flash.

The First step is to configure the NAT entry

This is the default NAT entry used for internet

traffic DON’T CHANGE IT!

Instead, we will add a NAT entry

The type is static

We are translating our inside address to an outside port

Put the internal host address here. There is no need to enter the netmask

(it defaults to exclusive)

The translated interface is the outside interface Ethernet1

EVERY PORT FORWARD IS A REDIRECTION! For SMTP they

would both be 25. For port redirection, the original port is

internal, the translated is the external

We will be dealing with incoming traffic, so we need to select the returning traffic

bullet

These ACLs are applied to this

interface

In most cases, we want to click add and select “Insert before”

Enter a description and include your

name so we can tell you modified it.

Of course we want to permit

trafficFor most cases the

source and destination should be set to any IP address. The nat entry

determines access.

The source port should remain “ANY” the destination port should match your

translated port

Don’t forget to apply the

changes!