127.0.0.2 to 127.0.0.5 are valid IP addresses. Those are just alias
addresses for your loopback interface.
Verify:
  % ifconfig -a

127.0.0.0/8 is for loopback, so you can't connect this address from
remote machines.
You may be able configure SSH port forwarding from your monitroing
host to cassandra node though I haven't try.

maki

2011/4/16 tinhuty he <tinh...@hotmail.com>:
> I have followed the description here
> http://www.edwardcapriolo.com/roller/edwardcapriolo/entry/lauching_5_node_cassandra_clusters
> to created 5 instances of cassandra in one CentOS 5.5 machine. using
> nodetool shows the 5 nodes are all running fine.
>
> Note the 5 nodes are using IP 127.0.0.1 to 127.0.0.5. I understand 127.0.0.1
> is pointing to local server, but how about 127.0.0.2 to 127.0.0.5? looks to
> me that they are not valid IP? how come all 5 nodes are working ok?
>
> Another question. I have installed MX4J in instance 127.0.0.1 on port 8081.
> I am able to connect to http://server:8081/ from the browser. However how do
> I connect using Jconsole that was installed in another windows
> machines?(since my CentOS5.5 doesn't have X installed, only SSH allowed).
>
> Thanks.

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