Ok, please forgive my ignorance.
We have a couple hundred remote sites, all running T1s to the Internet on 1841s. The 1841 creates a site-to-site IPSEC tunnel (non GRE) to our VPN Concentrator (nortel) at the corporate office. One site requires additional bandwidth and ordered a new T1 from AT&T. We don't know how to utilize both T1s with IPSEC, as the Nortel concentrator only allows one IP.
I have read up on Multilink PPP, but am confused on what needs to be done? Does AT&T have to be involved?
We cannot change our topology at the corporate office or add additional hardware. We've prefer not to use a IMUX. All of the configs I've seen show the leased lines running in parallel to another router, which is really not how we are setup. Again, all of our lines are public.
Any help/advice/direction is much appreciated!!!