PPPoE and 2 Static IPs for 2 routers

gmatheson · ‎08-18-2010

We want to connect as follows:

Internet <--> ISP PPPoE DSL Modem <--> Cisco 881 (DMVPN) <--> Cisco 871 (IPSec VPN) <--> LAN1 (Private)

<--> LAN2 (private)

We have 1 DSL internet connection and 2 Static IP's through PPPoE and 2 unique ID's and passwords.

Currently we have the Cisco 881 with 1 IP and have an outside DMVPN connection to another location.

We want to add another Cisco 871 to inside of the 881 for a different LAN. If it can be done?

How does the PPPoE have to be setup by the ISP (Currently PPPoE providing 2IP's using 2 usernames and passwords)? No problem if the routers are set up in parallel with the DSL modem.

Can we simply define a PPPoE passthrough on the 881 so the 871 gets a public IP or do we need to apply the 2 IP's to the 881?

We are stuck on how we should approach this from a design standpoint? Details come later.

paolo bevilacqua · ‎08-19-2010

You cannot passthrough (bridge) PPPoE from a router to another while terminating another PPPoE on the ADSL facing router. It does not work as you can see in another thread: ttps://supportforums.cisco.com/message/3160235#3160235

In other words, you are starting with a flawed design that will cause you many problems, if ever gets to work.

If there are two offices and each one want their own VPN, get two ADSL circuits.

gmatheson · ‎08-19-2010

Thank you for the well explained and definitive answer.

Saves us a lot of time looking for a solution that would not work.

Many thanks,

Glenn

paolo bevilacqua · ‎08-19-2010

You are welcome, curiously the same issue came up twice today.

I must amend my answer anyway, if you connect a small switch after the ADSL modem, you might be able to terminate two PPPoE session on two different ethernet routers. However, I have not tried that myself.

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