connection "breaks"


I've following problem here in our network:

From one machine the internetconnection is broken. While I can ping everywhere connections to servers outside the LAN break (websites only partially loaded, radiostreaming stops after 5 seconds, opening imap-boxes works 1 or 2 times and then timeout ...)


+--------+ +----------+ +-------+
|machine | --- WLAN --- |AP/router1| --- cable --- |router2|---internet
+--------+ +----------+ +-------+
|
cable
|
+---------+
| other |
| machines|
+---------+


Connection from the other machines to the internet has no problems and connection from the bad machine to the other machines has no troubles too !!

I can ping the whole world with any packagesize up to 15k and I dont see any errors in the logs or error-packages in ifconfig. I resetted all routers and the bad machine. I changed MTU on the accesspoint from 1500 to 1000 ... I dont know what to do now?

where should I start troubleshooting? What should I think off that I dont think off?

thnx,
peter
.

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