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  #1  
Old 02-01-2012
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Join Date: Dec 2011
Posts: 94
Is it possible to use Cisco 877 behind DSL-modem

I have been using a business DSL-connection and it cannot be used with some other router so I have to use the one that has been provided to me from the provider, In my case I just wanted to know that is it possible to use the Cisco 877W-G-E-K9 behind the modem and also set it up as VPN-server?? Is there anyone who has an idea about it and can help me out as well??
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  #2  
Old 02-01-2012
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Join Date: May 2011
Posts: 459
Re: Is it possible to use Cisco 877 behind DSL-modem

Quote:
I have been using a business DSL-connection and it cannot be used with some other router so I have to use the one that has been provided to me from the provider, In my case I just wanted to know that is it possible to use the Cisco 877W-G-E-K9 behind the modem and also set it up as VPN-server?? Is there anyone who has an idea about it and can help me out as well??
Before I suggest you something about this I just want you to make sure that you are having the Cisco 887 or Cisco 877, I am asking so because the Cisco 877 supports IPSec VPN when used with a K9 IOS,so just check it out and then let me know what you have for further help.
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  #3  
Old 02-01-2012
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Join Date: Dec 2011
Posts: 94
Re: Is it possible to use Cisco 877 behind DSL-modem

I have crossed check it and I am having the Cisco 877W-G-E-K9 and here is some more information about it:
  • It is having a POTS RJ11-connection behind it
  • ISP-modem forwards all the ports to 122.182.10.142
So I just wanted to know that is there a way to configure the cisco and make it work as a router behind the modem that I am having??
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  #4  
Old 02-01-2012
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Join Date: May 2011
Posts: 459
Re: Is it possible to use Cisco 877 behind DSL-modem

I will suggest you to use any of the FE port in order to connect to the ISP modem's RJ45 and then configure it as per the following:
Quote:
877(config)#int f0
877(config-if)#no switchport
877(config-if)#ip address (your ip address) 255.255.255.252
877(config)#int vlan 1
877(config-if)#ip address (your internal address)
877(config)#ip route 0.0.0.0 0.0.0.0 ISP_MODEM_IP
Just try it out and then let me know what you get.
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  #5  
Old 02-01-2012
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Join Date: Dec 2011
Posts: 94
Re: Is it possible to use Cisco 877 behind DSL-modem

I have tried it out but then it is not working in my case, I have found that the ISP-modem is having the 122.182.10.142 as ip but then I did not found DHCP configured and all ports are simply forwarded to 122.182.10.143 which I think is cisco router but then I am not very sure about it. Below is the default configuration of the cisco877 that I am using:
Internal network of cisco = 10.10.10.1 with DHCP.
The dialer and the NAT is not configured by now, are you having some template that I can use to configure the cisco without any problem??
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  #6  
Old 02-01-2012
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Join Date: May 2011
Posts: 459
Re: Is it possible to use Cisco 877 behind DSL-modem

I will suggest you to use the "no switchport access vlan" command, just for e.g.
Quote:
877(config-if)#no switchport access vlan
877(config-if)#(your ip address) ?
A.B.C.D (your ip address)
dhcp IP Address negotiated via DHCP
pool IP Address autoconfigured from a local DHCP pool
Just try it out and then let me know if it is making any difference.
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  #7  
Old 02-01-2012
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Join Date: May 2011
Posts: 442
Re: Is it possible to use Cisco 877 behind DSL-modem

I will suggest you to change the ip route 0.0.0.0 0.0.0.0 to ip route 0.0.0.0 0.0.0.0 122.182.10.142 and after that use the above command and then give it an ip address with the same range as that of the router, in your case which is Belgacom BBox which has been configured on the router which is on the dhcp pool, just try ot make the above changes and then see if it is helping you.
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  #8  
Old 02-01-2012
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Join Date: May 2011
Posts: 459
Re: Is it possible to use Cisco 877 behind DSL-modem

I have found that the 877 FE ports have been set to Layer 2 by default so I don?t think that the above will work, rather try this out:
Quote:
877(config)#vlan 10
877(config)#int vlan 10
877(config-if)#ip add 122.182.10.142.2 255.255.254.0
877(config-if)#int f0
877(config-if)#switchport access vlan 10
Check it out and then let me know what you get, best of luck.
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  #9  
Old 02-01-2012
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Join Date: Dec 2011
Posts: 94
Re: Is it possible to use Cisco 877 behind DSL-modem

Quote:
877(config)#vlan 10
877(config)#int vlan 10
877(config-if)#ip add 122.182.10.142.2 255.255.254.0
877(config-if)#int f0
877(config-if)#switchport access vlan 10

I have tried out the above solution as well but then they are not helping me out, is there any other thing that I can try out??
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  #10  
Old 03-01-2012
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Join Date: May 2011
Posts: 459
Re: Is it possible to use Cisco 877 behind DSL-modem

I think that your modem might be DHCP and NAT, if possible then just configure your 877 as following:
Quote:
int vl1
no ip nat in
int vl10
no ip nat out
ip add dhcp
no ip nat inside source list 101 interface vlan 10 overload
no ip route 0.0.0.0 0.0.0.0 122.182.10.142
ip route 0.0.0.0 0.0.0.0 dhcp
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