I was thinking about RAID1, and it got me thinking about networking in a similar fashion.

Let's say I have a PC with two 100Mbs Ethernet interfaces, eth0 and eth1, each connected to my 1000Mbs router. Is there some reason that eth0 and eth1 couldn't provide a virtual interface, vn0, which provided 200Mbs connectivity via simultaneous packet transmission? Please excuse this question if it seems uneducated; I do not have a full grasp of TCP/IP and network routing concepts.

If this is possible, does anyone know of any software that provides this functionality?

Regards,
Ewolf

it's called interface bonding or trunking here is an Ubuntu tutorial:

http://www.howtoforge.com/network_bonding_ubuntu_6.10

Ubuntu is debian based so this could work for you.