Ipswich won the East Anglian derby and booked their place in the Carling Cup third round thanks to goals from strike duo Pablo Counago and Kevin Lisbie.
An experimental home side reverted to their usual 4-4-2 formation midway through the first half and Counago soon fired a 25-yarder under Dean Gerken.
The visitors, buoyed by a 2,500-strong following, were 2-0 down on 56 minutes when Lisbie shot into the top corner.
But the Us got a late consolation when Steven Gillespie beat Richard Wright.
Ipswich: Richard Wright, Casement, McAuley, Naylor, Thatcher, Walters, Campo (Miller 76), Trotter, Quinn, Counago, Lisbie (Haynes 73). Subs Not Used: Supple, Lee, Balkestein, Smith, Rhodes.
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