Re: Disabling Multicast to run multiple JavaSpace

Hi Jools,

these are the reasons:

1st, our operational guys don't like the multicast announcements. (This
one must not be counted if you can help me fix the other two.)

2nd, I would like to run multiple services, side by side, each with
their own local Javaspace. I would like to be sure that each service is
accessing it's own, local Javaspace. Our services use a unicast URL to
contact their local lookup server. But with multiple spaces up and
running in the same network, you never know which space you are really
provided with. (At least I don't.)

3nd, there is a problem running multiple spaces, if there are firewalls
that blocks everything except multicast packages (so Jini announcements
slip through). In such an environment, my local lookup-server may
provide my local service with the address of a Javaspace instance
running behind a firewall. In this case, there is no way for my service
to access that Javaspace instance (and my service throws exceptions -
even though there is a local JS running fine).

A local JavaSpace is really all we need at the current time.

BR, Timur


On 22 11:57:16 AM, at 11:57 AM, Jools Enticknap wrote:

> Hi Timur,
>
> What makes you think that you need to disable multicast so you can
> have two or more JavaSpaces ?
>
> Although you maybe having a problem disabling multicast, you might be
> doing it for the wrong reason.
>
> Jini is designed to allow you to have as many, or few services
> (JavaSpaces are just services) as you like.
>
> Perhaps you could give us a little more insight ?
>
> --Jools
>
>
>> we're trying to disable multicast traffic, so that we can run two (or
>> more) JavaSpaces in parallel in the same LAN.
>>
>> Despite the fact that we have disabled multicast usage (zero length
>> array for multicastInterfaces), JINI discovers all configured
>> interfaces:
>>
>> CONFIG: LookupDiscovery - multicast network interface(s): [name:qfe3
>> (qfe3) index: 4 addresses:
>> /10.215.203.68;
>> , name:qfe2 (qfe2) index: 3 addresses:
>> /10.215.203.66;
>> /10.215.203.67;
>> , name:hme0 (hme0) index: 2 addresses:
>> /10.215.52.192;
>> , name:lo0 (lo0) index: 1 addresses:
>> /127.0.0.1;
>> ]
>>
>> [.....]
>> Mar 22, 2005 11:23:16 AM com.sun.jini.reggie.RegistrarImpl init
>> CONFIG: multicast disabled
>> Mar 22, 2005 11:23:16 AM net.jini.config.AbstractConfiguration
>> getEntryInternal
>> FAILED: ConfigurationFile@120cc56{transient-reggie.config}, component
>> com.sun.jini.reggie, name multicastRequestSubjectChecker: entry not
>> found
>> [.....]
>>
>> Obviously, multicast is disabled.
>>
>> Nevertheless:
>>
>> root@wherever#snoop -d qfe3 net 224.0.1.84 or net 224.0.1.85
>> Using device /dev/qfe (promiscuous mode)
>>   wherever-qfe3 -> JINI-ANNOUNCEMENT.MCAST.NET IP  D=224.0.1.84
>> S=10.215.203.68 LEN=28, ID=9325
>>            app1 -> JINI-ANNOUNCEMENT.MCAST.NET IP  D=224.0.1.84
>> S=10.215.203.66 LEN=28, ID=40772
>>            app1 -> JINI-ANNOUNCEMENT.MCAST.NET IP  D=224.0.1.84
>> S=10.215.203.66 LEN=28, ID=40773
>>
>> Multicast announcements are being sent out.
>>
>> Is there any way to totally disable the multicast traffic?
>>
>> Cheers,
>> Timur
>>
>>
>> Startup: ===
>>
>> #!/bin/sh
>> /apps/java/j2sdk/current/bin/java
>> -Djava.util.logging.config.file=reggie.log.properties
>> -Djava.security.policy=services.all.policy
>> -Djsk.lib=/apps/jini/jini2_0_002/lib -jar
>> /apps/jini/jini2_0_002/lib/start.jar t1.config
>>
>> ===
>>
>> t1.config: ===
>> import com.sun.jini.start.NonActivatableServiceDescriptor;
>> import com.sun.jini.start.ServiceDescriptor;
>> import com.sun.jini.config.ConfigUtil;
>>
>> com.sun.jini.start {
>>      private static reggieconf = "transient-reggie.config";
>>
>>      // Discovery Group to use
>>      private static group = "${user.name}";
>>
>>      private static httpdPort = "8090";
>>      private static codebaseBase = ConfigUtil.concat(new Object[] {
>>          "http://", ConfigUtil.getHostName(), ":", httpdPort, "/"});
>>
>>      private static policy = "services.all.policy";
>>      private static classpathBase = ConfigUtil.concat(new Object[] {
>>           "${jsk.lib}","${/}"});
>>
>>      static serviceDescriptors = new ServiceDescriptor[] {
>>
>>          // httpd
>>          new NonActivatableServiceDescriptor(
>>              "",
>>              policy,
>>              ConfigUtil.concat(new Object[] {classpathBase,
>> "tools.jar"}),
>>              "com.sun.jini.tool.ClassServer",
>>              new String[]{"-port", httpdPort, "-dir", "${jsk.lib}",
>> "-verbose"}),
>>          // Reggie (lookup service)
>>          new NonActivatableServiceDescriptor(
>>              ConfigUtil.concat(new Object[] {codebaseBase,
>> "reggie-dl.jar"}),
>>              policy,
>>              ConfigUtil.concat(new Object[] {classpathBase,
>> "reggie.jar"}),
>>              "com.sun.jini.reggie.TransientRegistrarImpl",
>>              new String[] { reggieconf })
>>      };
>> }
>> ===
>>
>> transient-reggie.config: ===
>> import net.jini.jeri.BasicILFactory;
>> import net.jini.jeri.BasicJeriExporter;
>> import net.jini.jeri.tcp.TcpServerEndpoint;
>>
>> com.sun.jini.reggie {
>>
>>      multicastInterfaces = new java.net.NetworkInterface[]{};
>>      initialMemberGroups = new String[] { "cb-member-group" };
>> }
>> ===
>>
>> ======================================================================
>> =====
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>> the body
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>> email to
>> [email protected] and include in the body of the message "help".
>>
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>>
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>
> =======================================================================
> ====
> To unsubscribe, send email to [email protected] and include in the
> body
> of the message "signoff JAVASPACES-USERS".  For general help, send
> email to
> [email protected] and include in the body of the message "help".
>
> To view past JAVASPACES-USERS postings, please see:
> http://archives.java.sun.com/archives/javaspaces-users.html
>
> JDC members can download the JavaSpaces(tm) Technology from:
> http://developer.java.sun.com/developer/products/jini/

===========================================================================
To unsubscribe, send email to [email protected] and include in the body
of the message "signoff JAVASPACES-USERS".  For general help, send email to
[email protected] and include in the body of the message "help".

To view past JAVASPACES-USERS postings, please see:
http://archives.java.sun.com/archives/javaspaces-users.html

JDC members can download the JavaSpaces(tm) Technology from:
http://developer.java.sun.com/developer/products/jini/