Strange network behavior SSH to pi/wifi -"no route to host"

[basti122303]

I use a dlink DWL-122 G on the pi with 2013-02-09-wheezy-raspbian (no rpi-updates, no dist-upgrade only apt-get update/install)

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Bus 001 Device 005: ID 2001:3c00 D-Link Corp. AirPlus G DWL-G122 Wireless Adapter(rev.B1) [Ralink RT2571]

IP,DNS,route all is ok on pi,
i log-out.

After 10 or 15 min i try to login via ssh again -- Without luck.
Try SSH from my router (fritz.box) to raspberry works fine.
2nd try from my laptop to pi does also works for now.
10 min later the same, "no route to host"

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root@raspberrypi:/home/develop/mongodb_pi# exit
logout
Connection to 192.168.178.40 closed.
basti@thinkpad:~$ ssh root@192.168.178.40
ssh: connect to host 192.168.178.40 port 22: No route to host
basti@thinkpad:~$ ssh root@192.168.178.1
root@192.168.178.1's password: 
   __  _   __  __ ___ __
  |__ |_) |__ |__  |   /
  |   |\  |__ |__  |  /_

   The fun has just begun ...


BusyBox v1.20.2 (2012-12-20 16:50:46 CET) built-in shell (ash)
Enter 'help' for a list of built-in commands.

root@fritz:/var/mod/root# ssh 192.168.178.40
root@192.168.178.40's password: 
ssh: Connection to root@192.168.178.40:22 exited: Interrupted.
root@fritz:/var/mod/root# exit
Connection to 192.168.178.1 closed.
basti@thinkpad:~$ 
basti@thinkpad:~$ ssh root@192.168.178.40
root@192.168.178.40's password: 
Permission denied, please try again.
root@192.168.178.40's password: 
Permission denied, please try again.
root@192.168.178.40's password: 
Permission denied (publickey,password).
basti@thinkpad:~$ 
basti@thinkpad:~$ ssh root@192.168.178.40
ssh: connect to host 192.168.178.40 port 22: No route to host

dmesg do nothink log during this time.

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[Tue Mar 12 09:09:14 2013] wlan0: authenticate with 00:1f:3f:9f:26:30
[Tue Mar 12 09:09:14 2013] wlan0: send auth to 00:1f:3f:9f:26:30 (try 1/3)
[Tue Mar 12 09:09:14 2013] wlan0: authenticated
[Tue Mar 12 09:09:14 2013] rt2500usb 1-1.3.1:1.0: wlan0: disabling HT as WMM/QoS is not supported
[Tue Mar 12 09:09:14 2013] wlan0: associate with 00:1f:3f:9f:26:30 (try 1/3)
[Tue Mar 12 09:09:14 2013] wlan0: RX AssocResp from 00:1f:3f:9f:26:30 (capab=0x411 status=0 aid=1)
[Tue Mar 12 09:09:14 2013] wlan0: associated
[Tue Mar 12 09:09:16 2013] bcm2835-cpufreq: switching to governor ondemand
[Tue Mar 12 09:09:16 2013] bcm2835-cpufreq: switching to governor ondemand<6>[   26.964581] Adding 102396k swap on /var/swap.  Priority:-2 extents:1 across:102396k SS
[Tue Mar 12 15:56:06 2013] mmc0: missed completion of cmd 18 DMA (512/512 [1]/[1]) - ignoring it
[Tue Mar 12 15:56:06 2013] mmc0: DMA IRQ 6 ignored - results were reset
root@raspberrypi:~# 

The network looks like

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wan -- fritz.box (router,DNS,wifi) -- fritzbox2 (ip-client,wifi) -- pi and laptop via wifi near to fritzbox2

A Cron job i have installed yesterday to fix this with ping the router very 10 min does log that ping was ok all the time.
Yesterday i also disable (exit 0 on top)

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/etc/pm/sleep.d/ifplugd

wifi power-management is also disabled by /etc/network/interfaces

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root@raspberrypi:~# iwconfig wlan0 | grep Power
          Bit Rate=54 Mb/s   Tx-Power=20 dBm   
          Power Management:off
root@raspberrypi:~# 

2 days before i try to fix this with reinstall the system.

Any suggestions ?

[FTrevorGowen]

I use a dlink DWL-122 G on the pi with 2013-02-09-wheezy-raspbian (no rpi-updates, no dist-upgrade only apt-get update/install)

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Bus 001 Device 005: ID 2001:3c00 D-Link Corp. AirPlus G DWL-G122 Wireless Adapter(rev.B1) [Ralink RT2571]

Is the dongle plugged directly into the Pi or via a hub? If the latter is it a "powered hub"? What "MxPwr" (current) does the command "usb-devices" report? (You'll have search for equivalent entry to that above which appears to be from "lsusb"). Most WiFi dongles tend to demand a high current when searching for or re-establishing a connection which may not "be available". I've noticed similar ssh and ping "drop-outs" when the connection has not re-established itself - re-booting usually recovers things. (See also my "Networking a model A Pi" thread).
Trev.

[basti122303]

Oh i forgotten to post, the device need no more than 300mA with an established connection.

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T:  Bus=01 Lev=03 Prnt=04 Port=00 Cnt=01 Dev#=  5 Spd=480 MxCh= 0
D:  Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs=  1
P:  Vendor=2001 ProdID=3c00 Rev=00.01
S:  Manufacturer=ANI
S:  Product=802.11g W
C:  #Ifs= 1 Cfg#= 1 Atr=80 MxPwr=300mA
I:  If#= 0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=rt2500usb

At the moment i use the original 1,2A power supplier, would i get more power on USB-line with a 2A power supplier or is there a limititer on the borad?

All is connect to a powerd USB hub, on the raspi the is too weak power.

[basti122303]

The trick with the router doesn't work anymore.