Question

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SETUP VPN network

By soundofthunder ·
Dear all,

I need to setup a VPN connection using a cisco 871 router.
The remote site gave me the vpn address on internet which is:
213.174.x.x
I've to use a network address on 192.168.100.x on 30 bit mask 255.255.255.252

- at this step i've a lock situation as my router will not accept this mask with 192.168.x.X address's!!!

The other complicated situation, is the internet address from my side is provided by a router box that i can't remove!!

According to this situation, i've drawn the following diagram: but can anyone help me to find the correct IP's to setup and then give me the x.x.x.x values?

PC [my side] x.x.x.x
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LAN port of router Cisco x.x.x.x
CISCO 871-sec-k9
WAN port of Cisco x.x.x.x
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Internet Router LAN port x.x.x.x
Internet ROuter
Internet Public ADDRESS
88.163.x.x
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|________-------------__________Internet____________|
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213.174.x.x
Internet public address
VPN
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LAN
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|22.1.x.x


Any comments, suggestion would be very much appreciated.

best regards

Elie

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by NetMan1958 In reply to SETUP VPN network

In order to figure out what IP Addresses to use in the 192.168.100.X 255.255.255.252 subnet, we need to know what X is. With that mask your first 3 octets are going to be 192.168.100 but the last octet can range from 0 to 252 in increments of 4. So If we know X is 0 then your usable IP Addresses would be 1 and 2. If X is 4 the usables are 5 and 6. If X is 252 the usables are 253 and 254.

As for the extra router, it would be best if you could substitute your Cisco in place of it. Have you checked with your ISP to see if they will allow that? Other than that, are any other public IPs allocated to you other than the one 88.163.x.x on the internet router? What is the subnet mask used with that IP?

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by soundofthunder In reply to Comments

Dear Netman

First of all thanks aso much for your answer and the attention to my post.


The address of the network is 192.168.84/30 so as you said the address's to use are 192.168.100.85 and 192.168.100.86.
What i did, i setup the DHCP server set on VLAN 1 to attribute 2 adress's only and the mask remain 255.255.255.0 otherwise the cisco won't accept it.

About the router and ISP, we've a ISP making authentication by mac address and this limits use of another device to get access to internet that the one given by the ISP. In the other hand, even if it was possible the 871 Cisco does not have a modem integrated and the WAN port is a FE4 Ethernet port.
But maybe it'd basically work with a simple ADSL modem attached to Cisco Router?

Do you think, it will not be feasible to configure the Cisco to connect to WAN across the ISP device?

To complete my post, the WAN networks is:
88.163.26.x / 24
88.163.26.254

I'll contact my ISP again ; if you've other comments that could help, please post.


best regards

Elie

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by NetMan1958 In reply to comments

Let's start with the WAN part. If your ISP circuit is DSL and the equipment they provided is a router, then it may be possible to put their device in bridged mode so that it will pass the public IP to your Cisco's WAN interface. Also, the ISP can usually configure their system to use a different mac address for authentication. I would check with the ISP for advice on this.

I'm curious about your Cisco not accepting the IP Address. What is the error message you get when you try to assign 192.168.100.85 255.255.255.252 to the router and which interface are you attempting this on?

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