Stig Bakken stig at zedge.net
Wed Feb 16 23:20:39 CET 2011

On Wed, Feb 16, 2011 at 9:37 PM, alexus <alexus at gmail.com> wrote:

> How does Varnish handles DDOS?
> here is my problem, in our environment varnish servers static pages
> but dynamic pages it passed to application server (apache).
> so every onces in a while we have some attacker(s) who start doing
> some sort of attacks against us, and apache hits very high load on
> server and about to go down...
> so I look up an IP address and I block it on Varnish .vcl file, and
> load goes back to normal right away...
> is there something that can be done automatically? or is there
> anything can be done at all to somehow handle this type of issue?
> please advise

Usually you would handle this in your firewall.  Varnish is a fine hammer,
but for some things screwdrivers still rule.
(Btw, if blocking IP addresses does the trick for you, it's just a DOS, not
a DDOS.)

 - Stig

Stig Bakken
CTO, Zedge.net - free your phone!
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