Cisco RVS4000 - Gigabit Security Router User's Guide download pdf (Page 42)

Troubleshooting

4-Port Gigabit Security Router with VPN

Appendix A

I am not able to access the Router’s Web-based Utility

Setup page.

Refer to “I want to test my Internet connection” above 1.

to verify that your computer is properly connected to

the Router.

Verify that your computer has an IP Address, Subnet 2.

Mask, Gateway, and DNS.

Set a static IP address on your system; refer to “I need 3.

to set a static IP address” above.

Refer to “I need to remove the proxy settings or the 4.

dial-up pop-up window (for PPPoE users)” below.

I can’t get my Virtual Private Network (VPN) to work

through the Router.

Access the Router’s web interface by going to

http://192.168.1.1 or the IP address of the Router, and go

to the VPN -> VPN Pass Through tab. Make sure you have

IPSec passthrough and/or PPTP passthrough enabled.

VPNs that use IPSec with the ESP (Encapsulation Security

Payload known as protocol 50) authentication will work

fine. At least one IPSec session will work through the

Router; however, simultaneous IPSec sessions may be

possible, depending on the specifics of your VPNs.

VPNs that use IPSec and AH (Authentication Header

known as protocol 51) are incompatible with the Router.

AH has limitations due to occasional incompatibility with

the NAT standard.

Change the IP address for the Router to another subnet

to avoid a conflict between the VPN IP address and your

local IP address. For example, if your VPN server assigns

an IP address 192.168.1.X (X is a number from 1 to 254)

and your local LAN IP address is 192.168.1.X (X is the same

number used in the VPN IP address), the Router will have

difficulties routing information to the right location. If

you change the Router’s IP address to 192.168.2.1, that

should solve the problem. Change the Router’s IP address

through the Setup tab of the Web-based Utility. If you

assigned a static IP address to any computer or network

device on the network, you need to change its IP address

accordingly to 192.168.2.Y (Y being any number from 1 to

254). Note that each IP address must be unique within the

network.

Your VPN may require port 500/UDP packets to be passed

to the computer that is connecting to the IPSec server.

Refer to “I need to set up online game hosting or use other

Internet applications” below for details.

Check the Linksys website at www.linksys.com for more

information.

I need to set up a server behind my Router.

To use a server like a web, ftp, or mail server, you need

to know the respective port numbers they are using. For

example, port 80 (HTTP) is used for web; port 21 (FTP) is

used for FTP, and port 25 (SMTP outgoing) and port 110

(POP3 incoming) are used for the mail server. You can get

more information by viewing the documentation provided

with the server you installed. Follow these steps to set up

port forwarding through the Router’s Web-based Utility.

We will be setting up web, ftp, and mail servers.

Access the Router’s Web-based Utility by going to 1.

http://192.168.1.1 or the IP address of the Router. Go

to the Firewall -> Single Port Forwarding tab.

Select the Service from the 2. Application column.

Enter the IP Address of the server that you want the 3.

Internet users to access. For example, if the web

server’s Ethernet adapter IP address is 192.168.1.100,

you would enter 100 in the field provided. Then check

the Enable checkbox for the entry. Consider the

examples below:

Appli-

cation

Start

and End

Proto-

col

IP Address

Enable

HTTP 80 to 80 Both 192.168.1.100 X

FTP 21 to 21 TCP 192.168.1.101 X

SMTP

(outgoing)

25 to 25 Both 192.168.1.102 X

POP3

(incoming)

110 to

110

Both 192.168.1.102 X

Configure as many entries as you like.4.

When you have completed the configuration, click Save

Settings.

I need to set up online game hosting or use other Internet

applications.

If you want to play online games or use Internet

applications, most will work without doing any port

forwarding or DMZ hosting. There may be cases when you

want to host an online game or Internet application. This

would require you to set up the Router to deliver incoming

packets or data to a specific computer. This also applies to

the Internet applications you are using. The best way to

get the information on what port services to use is to go

to the website of the online game or application you want

to use. Follow these steps to set up online game hosting

or use a certain Internet application:

Access the Router’s Web-based Utility by going to 1.

http://192.168.1.1 or the IP address of the Router. Go

to the Firewall -> Single Port Forwarding tab.

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