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xen-devel
RE: [Xen-devel] [PATCH] example and default IP addresses
Hi Keir --
Per the below discussion, could you revert the change to network-nat
in the new cset 16739?
Thanks,
Dan
> -----Original Message-----
> From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
> [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx]On Behalf Of Ian Jackson
> Sent: Thursday, January 17, 2008 8:35 AM
> To: dan.magenheimer@xxxxxxxxxx
> Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: RE: [Xen-devel] [PATCH] example and default IP addresses
>
>
> Dan Magenheimer writes ("RE: [Xen-devel] [PATCH] example and
> default IP addresses"):
> > In the patch to network-nat, I see that you are replacing
> the 10.0.0.0/16
> > usage with 192.0.2.0/24. Actually, vif-nat has a dependency on it
> > being 10.0.0.0/8(!), at least if more than 256 domains are
> launched (not
> > necessarily simultaneously, just sequentially created and
> destroyed).
> > In vif-nat ip_from_dom, IP's are created as 10.x.y.z for
> vifw.z, where
> > x*256+y==w.
>
> Firstly, I think it's important to note that network-nat and vif-nat
> are pretty ropey. Anyone who is using them will almost certainly have
> had to adjust them to local conditions anyway. For example, these
> scripts attempt to find and edit your local dhcp server configuration
> file !
>
> > I'm not sure what the right answer is, but 192.0.2.0/24 definitely
> > doesn't have enough bits. And regardless of the answer,
> vif-nat will
> > need to be patched also.
>
> Having said that, I think you're right. vif-nat does indeed have to
> use 10/8 for static hosts for the reason you give. Although really I
> think this is a poor approach. So my change to network-nat ought not
> to be applied.
>
> In practice many people using this code in any real setting are likely
> to fall foul of address clashes anyway as it's very likely that they
> have at least some use of 10/8 ...
>
> Ian.
>
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> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel
>
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