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Date: Mon, 4 Feb 2013 17:51:15 +1300
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Subject: Re: unwanted tcp6 protocol in tribes listener socket;
From: Vince Stewart <stewart.vince@gmail.com>
To: Tomcat Users List <users@tomcat.apache.org>
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Hi Tim,
thanks so much for your reply
netstat -t -l  yields that includes:
Active Internet connections (only servers)
Proto     Recv-Q  Send-Q    Local Address                       Foreign
Address         State
tcp6       0          0              myComputerName:4000
[::]:*                        LISTEN
netstat -atn | grep -P ":4000\W"  yields (without any headings line)
tcp6       0          0              127.0.1.1:4000
:::*                          LISTEN

re But why would you want that limitation?
My first aim was to send a single message from home to my VPS or vice
versa. When I did not succeed I have been fishing for reasons and the first
thing that struck me was that Ubuntu was reporting tpc6 but NioReceiver
object "clusterReceiver" had a "bind" property of type Inet4Address and an
address of 2130706689 (127.0.0.1).

Possibly though, this is a normal IPv6 connection and I should treat it
accordingly. I'll give that ago tomorrow morning and keep CATALINA_OPTS in
mind as well.

Many thanks for your help.


On Mon, Feb 4, 2013 at 4:06 PM, Tim Watts <tim@cliftonfarm.org> wrote:

> On Mon, 2013-02-04 at 14:39 +1300, Vince Stewart wrote:
> > Using Tomcat 7.0.35 embedded in Java standalone application. Java SE
> 1.7.0.
> > Ubuntu 12.04
> >
> > Hi All,
> >
> > I have an experimental class below. The aim is just to open a listening
> > port on port 4000 in the "localhost" address.
> > When this has run, the address for the listener is "127.0.0.1" in other
> > words an IPv4 address.
> > However the SocksSocketImpl object representing the real socket continues
> > to display the* useV4* property as *false*
> > and my Ubuntu system displays the listening socket as "tpc6".
> >
> Listening only for tcp6?  What does
>         netstat -atn | grep -P ":4000\W"
> show?
>
> Perhaps what you want is to set the java.net.preferIPv4Stack system
> property in CATALINA_OPTS?  Description here:
>
> http://docs.oracle.com/javase/7/docs/technotes/guides/net/properties.html
>
> But why would you want that limitation?
>
>
> > I suspect there is some configuration issue somewhere and if anyone can
> > help with this, I would be most grateful.
> >
> > I have also noted that the java.nio.channels.spi.SelectorProvider cannot
> > return a Provider from loadProviderFromProperty() or
> loadProviderAsService()
> > so therefore issues *provider =
> > sun.nio.ch.DefaultSelectorProvider.create()*resulting in a
> > ServerSocketChannel that is of type
> > *sun.nio.ch.ServerSocketChannelImpl*
> > and a ServerSocket of type *sun.nio.ch.ServerSocketAdapter*. I'm not sure
> > that these are intended and may be I need a system property named
> > "java.nio.channels.spi.SelectorProvider" to ensure some other
> > SelectorProvider and therefore different ServerSocketChannel and
> > ServerSocket types.
> >
> > public class TribalAfiliations{
> >  Channel myChannel;
> >  private static class MyMemberListener implements MembershipListener{...}
> >  private static class MyMessageListener implements ChannelListener{...}
> >
> >  TribalAfiliations() throws SocketException{
> >  this.myChannel=new GroupChannel();
> >  ChannelListener msgListener = new TribalAfiliations.MyMessageListener();
> >  MembershipListener mbrListener = new
> TribalAfiliations.MyMemberListener();
> >  myChannel.addMembershipListener(mbrListener);
> >  myChannel.addChannelListener(msgListener);
> >    try{
> >
> >
> myChannel.start(Channel.MBR_TX_SEQ|Channel.MBR_RX_SEQ|Channel.SND_TX_SEQ|Channel.SND_RX_SEQ);
> >    /// same problem, with    myChannel.start(Channel.DEFAULT);
> >    }
> >    catch(ChannelException e){
> >    System.out.println(e.getMessage());
> >    }
> >  }
> >
> >
> >
> >
> >
> >
>
>


-- 
Vince Stewart

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