Re: [Openvpn-users] need some form of anti-DOS in openvpn?

2015-08-12 Thread Erich Titl
Hi Am 12.08.2015 um 04:12 schrieb Jason Haar: Hi there ... Not much to go on I know, but could there be some way for openvpn server to keep track of something like "timestamp:externalIP:cert" and basically start ignoring new sessions if it sees more than one every XX seconds? That would redu

Re: [Openvpn-users] need some form of anti-DOS in openvpn?

2015-08-12 Thread Jason Haar
On 12/08/15 20:20, Erich Titl wrote: > > The script might do this just the same. This would avoid having to > wait for an implementation in openvpn, which might break behaviour too. > Well yeah - but it's the calling hundreds of scripts per minute that are causing the load :-) ...but you are corr

Re: [Openvpn-users] need some form of anti-DOS in openvpn?

2015-08-12 Thread Erich Titl
Hi Am 12.08.2015 um 11:18 schrieb Jason Haar: On 12/08/15 20:20, Erich Titl wrote: The script might do this just the same. This would avoid having to wait for an implementation in openvpn, which might break behaviour too. Well yeah - but it's the calling hundreds of scripts per minute that

Re: [Openvpn-users] need some form of anti-DOS in openvpn?

2015-08-12 Thread Gert Doering
Hi, On Wed, Aug 12, 2015 at 01:20:38PM +0200, Erich Titl wrote: > You may want to mess around with the sticky bit on those scripts. I have my doubts that this would be doing anything at all on a recent unix or linux - and even then, it won't stop recompilation of the script on each call, which is

[Openvpn-users] Inserting hmac/tls-auth onto a production OpenVPN Server

2015-08-12 Thread Rui Santos
Hi all, I'm now hardening our OpenVPN Production Server. I've managed to hardened all required aspects, except the HMAC/TLS-AUTH option. AFAICT, activating the HMAC extra security mechanism, will force me to reconfigure all clients, with the risk of failure and a lot of downtime. The only way a

Re: [Openvpn-users] Inserting hmac/tls-auth onto a production OpenVPN Server

2015-08-12 Thread Jan Just Keijser
Hi Rui, On 12/08/15 16:49, Rui Santos wrote: > Hi all, > > I'm now hardening our OpenVPN Production Server. > I've managed to hardened all required aspects, except the HMAC/TLS-AUTH > option. > > AFAICT, activating the HMAC extra security mechanism, will force me to > reconfigure all clients, with