[pve-devel] dhcp : lease a mask with 255.255.255.255 is not possible

[Alexandre DERUMIER]

>>Maybe that is related, because virtio uses TSO, but e1000 not.
Yes, I think that the problem.

>>But dhcp with our Windows server works without problems, so maybe it 
>>is related to dnsmasq? 

I really don't known ... (maybe this is also related to virtio driver version ?)


Note that I don't have see the problem with routing to tap directly without bridge
But I have see the problem with an ubuntu guest on bridge.



----- Mail original ----- 

De: "Dietmar Maurer" <dietmar at proxmox.com> 
À: "Alexandre DERUMIER" <aderumier at odiso.com> 
Cc: "pve.proxmox.com" <pve-devel at pve.proxmox.com> 
Envoyé: Jeudi 29 Août 2013 12:37:34 
Objet: RE: [pve-devel] dhcp : lease a mask with 255.255.255.255 is not possible 

OK, thanks for the links. 

What I observed recently that dhcp with dmsmaq does not work with virtio, 
but works perfectly with e1000. 

Maybe that is related, because virtio uses TSO, but e1000 not. 

But dhcp with our Windows server works without problems, so maybe it 
is related to dnsmasq? 


> I have also see users on proxmox forum having this problem, don't 
> remember exactly but it's related to offloading (offloading of physical 
> interface or offloading in virtio nic) 
> 
> 
> also on the wiki 
> http://pve.proxmox.com/wiki/Win7_Guest_DHCP_not_working_fix 
> 
> or here 
> 
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/610391 
> http://www.mail-archive.com/debian-bugs- 
> dist at lists.debian.org/msg1055766.html