Ipswich Town boss Joe Royle was disappointed with the number of chances his side missed: "We had more than 20 attempts at goal but we hit the post and missed countless chances.
"I had the feeling that this match could be the trickiest of our final three. Forest at full strength are one of the better sides in the division. They proved that today.
"They were dangerous on the break when we were stretched and chasing the game. We were generally on top but couldn't force a goal when we needed it.
"David Johnson took both his goals superbly. He came back to haunt us but, apart from his goals, did not have an awful lot to do.
"We are still in the position of knowing that we will be in the play-off if we win our final two matches. I'd have settled for that position a few weeks ago."
Meanwhile Opposite number Joe Kinnear lept to the praise of former blues striker Johnson: "Now the pressure about avoiding relegation is over and I can enjoy a weekend.
"It was a brilliant performance. We came with a game plan to go out and play. The pitch lent itself to producing good football. We created chances and David Johnson came up trumps.
"It is great to have him back. He has the nous for goal and knows how to finish and he's brave. He's not yet as sharp as he could be, but he will be.
"Our two central defenders, Michael Dawson and Wes Morgan, were magnificent. In the second half we were forced to defend deep to withstand an aerial attack after Shefki Kuqi was introduced to the Ipswich attack.
Ipswich 1-2 Nottingham Forest - Manager Reaction
"It's mission accomplished. It was always the target to avoid the drop when I was appointed. We were aiming for 50 points but found that was not enough. The goalposts change every week and it's a great relief that we've done it."