Re: [Xen-devel] [OSSTEST PATCH v2 07/19] ts-host-install: don't use the new nic naming scheme

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Fri, Jan 19, 2018 at 05:56:15PM +0000, Ian Jackson wrote:
> Wei Liu writes ("Re: [Xen-devel] [OSSTEST PATCH v2 07/19] ts-host-install: 
> don't use the new nic naming scheme"):
> > On Fri, Jan 19, 2018 at 05:08:09PM +0000, Ian Jackson wrote:
> > > 1. persistent-net.rules contains information saying "if nic with
> > > address aa:bb:cc:dd:ee:ff shows up, call it eth2; also, do not call
> > > anything else eth2".  So it has nothing to do with ip addresses.
> > 
> > The rule is generated by osstest, which says "please make this nic have
> > mac address XXXX". That would cause the guest to have the same mac
> > address as the host. When the guest is up and asks DHCP server for an
> > IP, it gets the host's IP.
> 
> persistent-net.rules (at least the parts of it generated by
> persistent-net-generator) does not change the mac addresses of nics.
> It matches according to the mac address and changes their "names".
> 
> I hope the osstest-generated one is no different.  I'm not even sure
> it's possible to change the mac address from a udev rule and if it is
> certainly nothing near us should do it.
> 

It is rather different. It is a hack put in by IanC to deal with
unreliable USB nic. IIRC the rule invokes ip to set the mac address.

Wei.

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