Bonding internet connections

Got two general questions:

1) I have two internet connections right now (both 7Mbit / 1Mbit links) and
I would like to bond them to get 2 Mbits up and keep the 7Mbit download
speed (NOT loadbalancing i.e. if I do a speed test I will actually see
2Mbits). I have heard of a package called ng_one2many in FreeBSD that does
this. Is there something similar in Linux?

2) If I am not mistaken ng_one2many, all it is doing is spoofing the SOURCE
address of the Layer 3 packet and using Layer 4 sequence numbers and a
round-robin algorithm to send out the packets on many internet connections
simultaneously, and then once your packets have been received by the
destination it sees your spoofed source address and then on its reply places
that source into the destination when the remote system builds its packets.
In my case I can choose either modem to be my downstream connection so that
modem will be responsible for receving the packets while both modems are
responsible for uploading.

Please correct me if I am wrong.

Thanks!