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TOPIC: 1 Cisco 2611 - 2 DSL connections - Possible ?

1 Cisco 2611 - 2 DSL connections - Possible ? 9 years 4 months ago #21770

Hi there,

My present setup atm is 2 x Cisco 1760's connected via WIC1-ENET to 2 ethernet DSL Modems, both routers connected to a 2924XL Switch etc etc.

I have in my possession a 2611 complete with a NM-4E module and was wondering would it be possible to have both DSL modems connected to the 2611 not for load balance or failover just so that there are 2 DSL connections on 1 router, only 1 requires inbound connections to services that I am allowing on a server. One of my DSL connections is Static IP'd, other is Dynamic.

I appreciate that there maybe issues, ie ip nat out and inside statements.

The purpose of the exercise is to have 1 Router with 2 DSL connections serving 2 Networks eg 192.168.1.x and 2.x

Help, Assistance or other advice appreciated.

VMT
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Re: 1 Cisco 2611 - 2 DSL connections - Possible ? 9 years 4 months ago #21783

  • semper
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You could do something like:

interface ethernet0
description ## DSL Connection 1 DHCP
ip address dhcp
no shutdown
ip nat outside
interface ethernet1
description ## DSL Connection 2 Static
ip address <enter_in_IP_Address_from_ISP> <subnetmask assigned by ISP>
no shutdown
ip nat outside
interface ethernet2
description ## LAN Connection 1
ip address 192.168.1.254 255.255.255.0
no shutdown
ip nat inside
interface ethernet3
description ## LAN Connection 2
ip address 192.168.2.254 255.255.255.0
no shutdown
ip nat inside

access-list 1 192.168.1.0 0.0.0.255
ip nat inside source list 1 interface ethernet0 overload
ip nat inside static tcp 192.168.2.1 80 <IP_Address_assigned_by_ISP> tcp 80
ip route 0.0.0.0 0.0.0.0 ethernet0
ip route 0.0.0.0 0.0.0.0 <GW_defined_by_ISP>

that should work. I've never tested something like that out though.

I could possibly setup a lab to test the configuration.
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Re: 1 Cisco 2611 - 2 DSL connections - Possible ? 9 years 4 months ago #21784

Hey thats great, my one concern was the ip nat inside/outside statements and the possibility of the mixup.

You have a cfg option of "ip nat inside source list 1 interface ethernet0 overload" would that not mean that only 1 i/f would be available for outgoing packets ? would there be a requirement to have the same again with the other ethernet i/f ?

Don't get me wrong, I a appreicate the help... was just a question :)
You could do something like:

Rest Deleted for Brevity

I could possibly setup a lab to test the configuration.

:) :)
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