Mac can't see airport express or servers after about an hour on wifi

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hi all,

i've been having few annoying problems network.

network has:
  • wired: mac mini, printer, small server
  • wifi: macbook pro, airport express, iphones

retired old netgear dg834gv2 in favour of new billion 7300n based on having reviews.

rely on being able access local server by, example, using
code:
  ssh servername.local
i use airport express stream music.

---

now, having upgraded both osx (to lion) , router (to 7300n) having following problems:
  • on freshly connecting network, macbook pro uses airport express/server perfectly.
  • after while (i don't know how long exactly, maybe hour) itunes pauses , won't play because says cannot find airport express.
  • airport utility can see ape cannot connect it.
  • can no longer access server using it's hostname, ip address.

nb:
iphone can access ape (but because regularly disconnects , reconnects network (ie if idle, disconnects).
far can tell, wired mac mini doesn't have problem, test more thoroughly , update.

devices on network assigned fixed ips router, attached screenshot shows wifi settings.
 

attached files:

ok, disabling wmmm thing seems have fixed 1 part of problem: can (seemingly) connect airport express consistently.

not, however, solve problem of being unable connect server/other computers ssh or through finder (netatalk on server avahi , other mac mini using bonjour).

interestingly, wired computers can communicate each other easily. can't reliable connection or macbook (wireless).

wonder if has "rip" settings under ethernet page?

there lots of different options , i'm not entirely sure they're (see attached screenshot).

thanks.

take back, airport express problem not fixed turning off wmmm thing :( square one.
 

attached files:



Forums Macs Mac OS X Server, Xserve, and Networking


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