Match ends, Grimsby Town 3, Eastleigh 0.
Grimsby will face Bristol Rovers in the Conference promotion final at Wembley after comfortably beating Eastleigh.
Eastleigh created the better of the early chances, but Ollie Palmer's sharp turn and shot extended Grimsby's 2-1 aggregate lead from the first leg.
Having set up the opener, Lenell John-Lewis then added a second with a cool right-footed finish before the break.
Eastleigh pushed forward but struggled to create chances, before Palmer slotted home a third to seal the win.
The result means Grimsby kept alive their hopes of returning to the Football League for the first time since their relegation from League Two in 2010.
Despite their play-off exit, Eastleigh can take pride from a successful debut season in non-league football's top tier.
Earlier in the day, Bristol Rovers eased into the promotion final with a 3-0 aggregate victory over Forest Green.
Grimsby Town manager Paul Hurst told BBC Radio Humberside:
"A good day for the club. We know there's one more, absolutely massive game in front of us, which we know is going to be difficult
"For the time being we'll enjoy this moment, and there's some planning for me to do.
"We've already got a skeleton plan in place but a few days rest and then really start the focus on that game."
- 4BrownBooked at 13minsSubstituted forClayat 68'minutes
- 20ArnoldSubstituted forHannahat 85'minutes
- 33PalmerSubstituted forPittmanat 79'minutes
- 27PellSubstituted forBurtonat 46'minutes
- 19HowardBooked at 34minsSubstituted forWalkerat 46'minutes
- 9ConstableSubstituted forOdubadeat 46'minutes
- Ben Toner
- Shots on Target
Second Half ends, Grimsby Town 3, Eastleigh 0.
Offside, Grimsby Town. Jon-Paul Pittman tries a through ball, but Jon-Paul Pittman is caught offside.
Foul by Ben Strevens (Eastleigh).
Jack Mackreth (Grimsby Town) wins a free kick.
Corner, Grimsby Town.
Attempt missed. Craig Clay (Grimsby Town) right footed shot from outside the box is too high.
Attempt missed. Lenell John-Lewis (Grimsby Town) header from the centre of the box is too high. Assisted by Ross Hannah.
Corner, Grimsby Town.
Substitution, Grimsby Town. Ross Hannah replaces Nathan Arnold.
Attempt blocked. Lenell John-Lewis (Grimsby Town) right footed shot from the right side of the box is blocked.
Foul by Craig McAllister (Eastleigh).
Shaun Pearson (Grimsby Town) wins a free kick.
Foul by Jamie Turley (Eastleigh).
Jon-Paul Pittman (Grimsby Town) wins a free kick.
Attempt missed. Craig McAllister (Eastleigh) right footed shot from outside the box misses to the left.
Substitution, Grimsby Town. Jon-Paul Pittman replaces Ollie Palmer.
Offside, Grimsby Town. Ollie Palmer tries a through ball, but Ollie Palmer is caught offside.
Foul by Nathan Arnold (Grimsby Town).
Jai Reason (Eastleigh) wins a free kick.