What is mcastBindAddr for??

[Patrick Wang <pw...@uclink.berkeley.edu>]

Hi,

 

I am currently setting up 2 linux server and enabled the clustering and
multicast for these 2 servers.

 

I verified using the cat /proc/net/igmp command and found out once I started the
tomcat, machine will subscribe to the 228.0.0.4 group, multicast address.

 

I also used the ethereal to see the network traffic, both machine 1 and machine
2 send out UDP packet to address 228.0.0.4. Since from machine1, it can see both
the traffic

>From machine1 and machine2 to 228.0.0.4, I assume it can receive the message on
group 228.0.0.4.

 

However I did not find any tcp replication traffic come between machine1 and
machine2, the traffic between machine 1 and 2 seems all MySQL database request.

 

Can anyone shed some light on? I did not figure out what's the mcastBIndAddr
inside the server.xml. Documentation indicate it is for binding the multicast
socket to an address?

 

I donot understand what this is for.

 

Thanks

Pat

Re: What is mcastBindAddr for??

[Filip Hanik - Dev Lists <de...@hanik.com>]

on a multihomed machine, you might only want to bind your multicast 
socket to one interface, hence you use the bind address

Filip

Patrick Wang wrote:
> Hi,
>
>  
>
> I am currently setting up 2 linux server and enabled the clustering and
> multicast for these 2 servers.
>
>  
>
> I verified using the cat /proc/net/igmp command and found out once I started the
> tomcat, machine will subscribe to the 228.0.0.4 group, multicast address.
>
>  
>
> I also used the ethereal to see the network traffic, both machine 1 and machine
> 2 send out UDP packet to address 228.0.0.4. Since from machine1, it can see both
> the traffic
>
> >From machine1 and machine2 to 228.0.0.4, I assume it can receive the message on
> group 228.0.0.4.
>
>  
>
> However I did not find any tcp replication traffic come between machine1 and
> machine2, the traffic between machine 1 and 2 seems all MySQL database request.
>
>  
>
> Can anyone shed some light on? I did not figure out what's the mcastBIndAddr
> inside the server.xml. Documentation indicate it is for binding the multicast
> socket to an address?
>
>  
>
> I donot understand what this is for.
>
>  
>
> Thanks
>
> Pat
>
>
>   
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>   


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