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bandwidth aggregation between 2 hosts in the same subnet

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Hi,

I'm trying to increase the bandwidth between two hosts (backup). Both
hosts are in the same /24 subnet and each of them is connected to
a Cisco switch by 2 GbE interfaces (intel e1000). The switches/host
are located in different building which are connected by 3 x GbE.


    building A                   |          building B
                                 |
--------                   ----- | -----                  --------
|      |eth2,10.60.1.241   |   | | |   |  10.60.1.244,eth2|      |
| host |-------------------| S |-|-| S |------------------| host |
|  A   |                   | W |-|-| W |                  |  B   |
|      |eth3,10.60.1.240   |   |-|-|   |  10.60.1.243,eth3|      |
|      |-------------------|   | | |   |------------------|      |
--------                   ----- | -----                  --------
                                 |

My goal is to increase the bandwidth for a single tcp session between
the two hosts for a backup job (per packet round robin?), not for
multiple connections between many hosts. I know that I won't get 2 x
115Mb/s because of packet reordering, but 20-30% more that a single
connection would be ok.

I followed different HowTOs 

http://www.lartc.org/howto/lartc.rpdb.multiple-links.html#AEN298
http://lartc.org/howto/lartc.loadshare.html
or something like: ip route...equalize via...

but I never got a higher transfer rate  between the two hosts than
max 115Mb/s with benchmarks like netpipe or netio.

I guess the route cache might be a problem here, or maybe I'm missing
some other important part. I'm running Debian Etch with Kernel 2.6.21
from backports.org.

Any ideas what I'm missing, or if it's possible at all? 

Thanks, Ralf
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