[pve-devel] hetzner bug with pve-firewall

alexandre derumier aderumier at odiso.com
Mon Sep 13 19:43:53 CEST 2021


Hi,


>  
> https://git.proxmox.com/?p=pve-firewall.git;a=commit;h=d9e7522b561ceb323e93affb29c9fced89fed967
> 
> would just require a bump + upload

is it possible to backport it to pve 6 ?
(I have seen 2 users on the forum requesting it )


Le vendredi 10 septembre 2021 à 12:43 +0200, Fabian Grünbichler a
écrit :
> On September 10, 2021 12:31 pm, alexandre derumier wrote:
> > Hi,
> > 
> > multiple users have reported problems with hetzner in bridged mode
> > this
> > week and pve-firewall
> > https://forum.proxmox.com/threads/proxmox-claiming-mac-address.52601/
> > https://forum.proxmox.com/threads/mac-address-abuse-report.95656/
> > 
> > Seem that hetzner have bugs or are under attack, but they are
> > flooding
> > traffic to proxmox nodes with wrong mac/ip destination.
> > 
> > The problem is that if users use pve-firewall with reject rules,
> > the
> > RST packet is send with the wrong mac/ip as source,
> > 
> > and then hertzner is blocking the server of the users ....
> > 
> > 
> > I'm looking to see if we could add filtering at ebtables level, to
> > drop
> > wrong mac destination.
> > 
> > But they are also another problem, if user use DROP as default
> > action,
> >  we have a default REJECT for whois port 53.
> > 
> > 'PVEFW-Drop' => [
> >    # same as shorewall 'Drop', which is equal to DROP,
> >    # but REJECT/DROP some packages to reduce logging,
> >    # and ACCEPT critical ICMP types
> >    { action => 'PVEFW-reject', proto => 'tcp', dport => '43' }, #
> > REJECT 'auth'
> > 
> > Does somebody known why we do a reject here ?  could it be change
> > to
> > drop ?
> 
>  
> https://git.proxmox.com/?p=pve-firewall.git;a=commit;h=d9e7522b561ceb323e93affb29c9fced89fed967
> 
> would just require a bump + upload
> 
> 
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