Re: NEWBIE QUESTION : Why does the installer not detect multicast on interfaces

On Feb 13, 2009, at 5:47 PM, Pranav Vaidya wrote:

> Hello Brian,
>
> Thank you for helping me out as it was your email that led to debug  
> what might have been happening.
> I figured out what was happening atleast with eth0 and I am  
> perfectly fine with that. I will only go ahead and fiddle with wlan0  
> afterwards. Please ignore my previous "BS" as the issue had nothing  
> to do SELinux since I tested this with both the SELinux as well as  
> the firewall on.
>
> It seems to me that in case of a multihomed system (I know a new  
> term now !!), only the latest added route add -net 224.0.0.0 netmask  
> 240.0.0.0 dev takes effect (still dont know why ?). So in my effort  
> to get both lo as well as eth0 working, I was first adding the route  
> command for eth0 and then for lo hence lo was working and eth0 was  
> not.

You are still definitely doing more with your network than most out-of- 
the-box users of Linux will. You shouldn't really need to setup routes  
at all and Linux should be able to correctly handle multicast traffic,  
even with a multihome setup. There should definitely be an order for  
the interfaces that are up and Jini should grab the first one unless  
otherwise told to use something else.

I used to do a presentation for the No Fluff Just Stuff tour that  
covered the Jini basics and had a quick setup for anyone that came to  
participate in a little Jini network. Worked great with Linux users,  
OS X, Windows, etc. We never needed any special tweaks. I dusted that  
sucker off when you posted your question, just to poke around again,  
and it all works fine without any tweaks.

I guess my question would be, what started you down the custom network  
configuration route in the first place and why didn't the default  
Linux configuration suit your needs?

-bp

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