[c-nsp] Is this config even possible?

[Tuc at T-B-O-H.NET]

Hi,

	I currently have a 3640 and need to put it into a very odd
configuration

E0/0 - Needs to be connected to a Satellite modem. This interface
has to do DHCP to the modem to get its ip, otherwise the Satellite modem
gets cranky. Because this is a *VERY* restrictive link (No inbound connections
allowed at all, other limitations...) I've set up an IPSEC Tunnel to a 
router elsewhere, and then running GRE under it. (THAT was a nitemare because
my endpoint is a private IP). I can go out this interface however I want
since it NATs it.

E0/1 - Needs to be connected to a Cisco 2924 switch (Fairly easy I think).

E1/0 - Needs to be connected to a Wireless antenna. I've been given a fixed
PRIVATE IP for this interface, and its behind a Cisco 2851 doing NAT, so 
all the typical "Behind NAT" rules apply.  Since I'm behind the 2851/NAT
I'd like to get a tunnel running back to the "router elsehwere" mentioned
above. Anything going out this interface HAS to go out with the IP assigned
to this interface

E1/1 - Connected to another Cisco 2924 switch (Fairly easy again I think)

My network inside is connected to the E0/1 connected 2924, and has its own
private IP space. The one connected to E1/1 is a warm standby (Everything 
would have to be re-plugged)

After resolving all that.... Is the following possible...

I want a floating "default route". The order would be :

Over the E1/0 tunnel
If unavailable, then over E1/0
If unavailable, then over E0/0 tunnel
If unavailable, then over E0/0
If unavailable.....Cry...


	OR, am I going about this the entirely wrong way? 

			Thanks, Tuc