[pve-devel] proxmox 2018 : add support for "virtual" network and network plugins ?

[Alexandre DERUMIER]

>>What is wrong using proxy-arp?

each vmbr which have the gateway, have the same ip AND mac address.

so router will see correctly the mac, but as it's on multiple servers connected to same network than router,
you'll have random network flappling.

The only way could be to have a different mac address, but in this case, we need to send garp to vm from host after a live migration,
and the vm will get the new gateway mac address.

But also garp to the router to tell than the vm is behind a new gateway mac address. (and I'm not sure it's possible, vm is sending a garp, but does it work with proxy-arp ?)



----- Mail original -----
De: "dietmar" <dietmar at proxmox.com>
À: "Alexandre Derumier" <aderumier at odiso.com>, "pve-devel" <pve-devel at pve.proxmox.com>
Envoyé: Vendredi 26 Janvier 2018 13:08:28
Objet: Re: [pve-devel] proxmox 2018 : add support for "virtual" network and network plugins ?

> On January 26, 2018 at 12:12 PM Alexandre DERUMIER <aderumier at odiso.com> 
> wrote: 
> 
> 
> I have talked with my network engineer, 
> 
> he's only see 2 possibility: 
> 
> 
> 1 use floating-ip/nat 1:1 on compute node and translate to vm private address 
> (so external router see mac-adress of compute node for the floating ip) 
> 
> or 
> 
> if vm have public ip directly, a vxlan need to be done between the compute 
> node and the external router(so the router see the vm mac address directly). 
> This can be done with a physical router (if it support vxlan), or another 
> proxmox "network" node gateway (with a default gateway to external router) 

What is wrong using proxy-arp?