nio2 test failures on the buillds (different on ppas and distro buildds)

the jdk testsuite fails some network related tests which should be able to pass if only the local host is configured/available. these tests seem to pass on the ppa buildds, but fail on the distro buildds.

the tests do not fail in a native installation, but in a buildd chroot as well. any hint what is missing in the setup of the buildds?

ppa builds (pass/fail/error)
jdk
                amd64 i386 lpia
jaunty 3348/53/1 3348/53/1 3348/53/1
karmic 3349/52/1 3349/52/1 3348/53/1
lucid 3354/46/0 3352/48/2 ---

distro builds (pass/fail/error)
jdk
                amd64 i386 lpia
jaunty 3253/72/2 3000/88/239
karmic 3008/107/239 3300/52/2
lucid 3353/47/2 3057/106/239 ---

ppas:
https://launchpad.net/~openjdk/+archive/ppa/+packages (up to karmic)
https://launchpad.net/~openjdk/+archive/ppa/+packages (lucid)

FAILED: java/nio/channels/DatagramChannel/Connect.java
FAILED: java/nio/channels/DatagramChannel/EmptyBuffer.java
FAILED: java/nio/channels/DatagramChannel/IsBound.java
FAILED: java/nio/channels/DatagramChannel/IsConnected.java
FAILED: java/nio/channels/DatagramChannel/ReceiveISA.java
FAILED: java/nio/channels/DatagramChannel/Sender.java
Error: java/nio/channels/DatagramChannel/SRTest.java
FAILED: java/nio/channels/etc/Shadow.java
FAILED: java/nio/channels/FileChannel/LongTransferTest.java
FAILED: java/nio/channels/FileChannel/Transfer.java
FAILED: java/nio/channels/Selector/Alias.java
FAILED: java/nio/channels/Selector/BasicAccept.java
FAILED: java/nio/channels/Selector/BasicConnect.java
FAILED: java/nio/channels/Selector/CloseWhenKeyIdle.java
FAILED: java/nio/channels/Selector/Connect.java
FAILED: java/nio/channels/Selector/ConnectWrite.java
FAILED: java/nio/channels/Selector/KeysReady.java
FAILED: java/nio/channels/Selector/OpRead.java
FAILED: java/nio/channels/Selector/ReadAfterConnect.java
FAILED: java/nio/channels/Selector/SelectAfterRead.java
FAILED: java/nio/channels/Selector/SelectorLimit.java
FAILED: java/nio/channels/Selector/SelectorTest.java
FAILED: java/nio/channels/Selector/SelectWrite.java
FAILED: java/nio/channels/ServerSocketChannel/AcceptAddress.java
FAILED: java/nio/channels/ServerSocketChannel/Basic.java
FAILED: java/nio/channels/ServerSocketChannel/NonBlockingAccept.java
FAILED: java/nio/channels/SocketChannel/AdaptSocket.java
Error: java/nio/channels/SocketChannel/AsyncCloseChannel.java
FAILED: java/nio/channels/SocketChannel/Basic.java
FAILED: java/nio/channels/SocketChannel/CloseAfterConnect.java
FAILED: java/nio/channels/SocketChannel/CloseRegisteredChannel.java
FAILED: java/nio/channels/SocketChannel/CloseTimeoutChannel.java
FAILED: java/nio/channels/SocketChannel/Connect.java
FAILED: java/nio/channels/SocketChannel/ConnectState.java
FAILED: java/nio/channels/SocketChannel/FinishConnect.java
FAILED: java/nio/channels/SocketChannel/Hangup.java
FAILED: java/nio/channels/SocketChannel/IsConnectable.java
FAILED: java/nio/channels/SocketChannel/LocalAddress.java
FAILED: java/nio/channels/SocketChannel/Shutdown.java
FAILED: java/nio/channels/SocketChannel/Stream.java
FAILED: java/nio/channels/SocketChannel/VectorIO.java
FAILED: java/nio/channels/SocketChannel/VectorParams.java
FAILED: java/nio/channels/SocketChannel/Write.java
FAILED: java/nio/channels/AsyncCloseAndInterrupt.java

java.net.SocketException: Network is unreachable
        at sun.nio.ch.Net.connect(Native Method)
        at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:525)
        at java.nio.channels.SocketChannel.open(SocketChannel.java:164)
        at Transfer.xferTest07(Transfer.java:357)
        at Transfer.main(Transfer.java:54)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:616)
        at com.sun.javatest.regtest.MainWrapper$MainThread.run(MainWrapper.java:94)
        at java.lang.Thread.run(Thread.java:636)