[GD-Windows] ADSL firewall networking problems

[Ivan-Assen I. <as...@ha...>]

Hello,

Just when we thought we have smoothed out all issues with our
networking code, we encountered the reality of broadband. 

We had tested with dialups from various providers and 
everything was fine, but we have several betatesters 
which are on ADSL. The most peculiar thing is that the
pre-game lobby and the in-game networking use the same
Winsock2 calls (we use our own networking layer, on top
of UDP), exactly the same ports, and still the lobby networking
works through ADSL, while in-game no packets are received.
The game, Celtic Kings, is a RTS with the traditional
peer-to-peer lockstep network model. It works beautifully
over thin pipes and with huge lags... 

What kind of firewalling/NAT/proxies are typical with ADSL
providers? ADSL is not offered in our corner of Europe
and thus it caught us entirely by surprise.

Has anyone had such experience? Can you give us some
advice (other than "heh, shoulda have used DirectPlay, ya losers")

regards,
Assen