Problems with Airdrop

hi

i'm having issues airdrop , i'm confused point need help. have looked through discussions , have tried various options, no joy.

so, here's problem. i'm trying share files between 3 computers:

1) 2010 imac running lion
2) late 2008 mbp running lion
3) mid 2010 mba running lion

issue mba can seem both mbp , imac on airdrop radar. imac cannot see mbp , vice versa, imac can see mba. however, mba cannot see imac. mbp can seen mba. confused? am!

know hardware models can work airdrop - of mine sweet.
know p2p network created, that's - it's not wireless network.
@ moment, testing, hardware on same desk, distance not issue.
updated latest standard.
have been system prefs , have compared of security stuff - have finder , file sharing set allow incoming , coutgoing connections.
file sharing set on.

due fact can see something, cannot work out issue lies. on gratefully received.

in advance

rob

 

what router use? have firewalls installed on anything?

 

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