[lxc-devel] Communication between single network namespace

[Eric Brower]

I've not worked with very recent kernels, but my recollection is that
a new network namespace (CLONE_NEWNET) is created with no network
devices (and, therefore, routing table entries) aside from the
loopback device, which is initially down.  Your code snippet is not
very helpful, but I'm guessing the error message is correct-- the
unshare'd process does not inherit the system's (parent namespace's)
devices or routing table.  Network device addition must be performed
from the parent namespace (refer to the 'ip' man page, and look for
'netns'), and device configuration/routing must still be configured
from within the clone'd process.

My suggestion to you is spawn a shell within your unshare'd process,
and poke around a bit to understand the environment you have created.

E

On Wed, Mar 9, 2011 at 8:52 PM, Maheswara Reddy  C - ERS, HCL Tech
<maheswarareddyc at hcl.com> wrote:
> Hi,
>
> I am implementing client/server programming in a single network namespace using AF_INET, but client connet() failing with error Network unreachable.
> Shall we use AF_INET or AF_UNIX, could some one explain.
>
>
> Int main()
> {
>
> if (unshare(CLONE_NEWNET)) {
>        perror("unshare");
>        return 1;
>         }
>
>   pthread_create(&thread1,NULL ,&server,(void*)valPtr);  // AF_INET   server socket
>   pthread_create(&thread2,NULL ,&client,(void*)valPtr);    // AF_INET client
>
>
> }
>
>
>
> Thanks
> Mahesh
>
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-- 
E