[Netkit.users] UML kernel versions

Massimo Rimondini rimondin a dia.uniroma3.it
Mar 13 Nov 2007 23:16:30 CET

Thank you Csaba for collecting this information. I can confirm most of 
these issues have been addressed in the latest release.

As for the memory amount, you can override the default value by setting 
a different one either in the ~/.netkit/netkit.conf file or in the 
environment variable NETKIT_MEMORY. However, we were already thinking of 
raising the default value to solve some issues with the new kernel. This 
change should make into the next release.

You can attempt to disable IPv6 by removing any IPv6 address associated 
to the network interfaces, but this may not still be enough. I'm not 
sure switching to a kernel module would be a good choice though: IP 
routing is something fundamental in Netkit, therefore we chose to enable 
it by default. Do you have any specific reason to call for the ability 
to completely disable IPv6?


Csaba Kiraly wrote:
> Dear all,
> I have been experimenting with many UML kernel version in the last 
> months, and I wanted to write a mail about the experiences, but I see 
> now that a new netkit-kernel version (2.3) was coming out.
> It seems to run on many configurations where I wasn't able to run 
> netkit, so worth upgrading.
> With the previous one I had problems:
> - running it on stock Fedora Core 6
> - running it after upgrading the filesystem with new glibc
> and the new one resolves these.
> I still put here some of the findings briefly.
> These issues are mostly related to UML, but of course influence Netkit 
> as well:
> Netkit refused to run for many reasons. I've seen dependence on:
> 1, Host kernel version & config
> 2, Host filesystem
>    - e.g. existance of /etc/tls
> 3, Guest kernel version
> 4, Guest filesystem
>    - I think the problem was the glibc version. After an upgrade with 
> apt-get, it wasn't starting with the old (2.6.11 based) kernel
> 5, Memory for VM
>    - the default configured in Netkit seems to be too low in many 
> cases! can it be changed?
> One more issue that remains (at least for me) in the new kernel is 
> that the kernel has IPv6 compiled in, which makes it quite difficult 
> to turn it off. Do you know any good ways to turn it off? Would it be 
> possible to have IPv6 as a module in the default kernel?
> Regards
> Csaba
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