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Re: [MirageOS-devel] auto configuring ip/netmask info

On 25 Feb 2014, at 17:09, Anil Madhavapeddy <anil@xxxxxxxxxx> wrote:

> Julian and I were looking into the various Xen config options for networking 
> this morning, and it turns out that the XL/XM toolstacks can both specify a 
> per-VIF ip/netmask/gateway directly in the VIF configuration. e.g.
> ```
> vif = ['bridge=xenbr0,ip=,netmask=,gateway=']
> These are written into the VIF backend tree in xenstore.

aha. i wondered about that. where's the best docs on xenstore -- it's probably 
something i should know a bit more about.

> I'd like to take advantage of this by having the network stack automatically 
> probe for it and use it if available (i.e. a 'default' mode in the stack 
> configuration, which can be overridden by the manual IP or DHCP options).
> Any thoughts on the best place to put it, though?  The obvious place is in 
> mirage-net-{unix/xen}, but we would need a Xenstore-equivalent for Unix 
> (which has come up several times. Dave, how viable is it to have a simple 
> Unix Xenstore that maps to a filesystem tree?  We can project configuration 
> variables into there for tuntap, and perhaps take care of bridge 
> configuration at the same time as well.

i can't comment on the viability of a unix equivalent, but that seems to make a 
lot of sense to me.

> Another backend that will need an equivalent registry-style interface are the 
> kFreeBSD backend (which could call back into userspace via an ioctl 
> interface).

what would the js backend do?  (or would the issue simply never arise?)



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