You don't really need ultra fast connections to fly IL2 online, i've done it in the past with as low as a 384/128 Kbps (downstream/upstream) DSL connection.
What matters most is the quality of the connection instead of the total bandwidth. Having a stable ping as high as 200 milliseconds to the server you are joining is good for relatively smooth gameplay, with some people saying that even 500msec is playable if not a lot of aircraft are present.
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