Commercial websites are very much on their own when it comes to protecting themselves against a flood of traffic that can deliberately knock their business offline for days at a time during a distributed denial of service, or DDoS, attack.
What ISPs currently offer as standard is stone-age in terms of sophistication and more centred on protecting the ISP’s network than cleaning out DDoS traffic and ensuring that legitimate traffic reaches the affected sites.
DDoS attacks are not a problem at the core, where we have acres of bandwidth, but as it gets out to the edge, where the routers and switching hardware is less substantial, then it can be quite damaging. ACLs, or Access Control Lists, summarily block access to the network from ranges of IP addresses containing DDoS traffic, or to the target URL. But this blanket approach makes no allowance for legitimate traffic, and partially accomplishes the DDoS attackers’ goal, in rendering the target site unavailable or unusable. Neither the ISP or victim are satisfied with the results.
One online gambling site, for example, uses DDoS mitigation specialist Prolexic to direct traffic through its datacentres when under attack. It’s expensive, but not as expensive as losing literally millions of pounds in unplaced bets if – over a key sporting weekend – the site is taken down by an attack. It’s a gamble they can’t afford to lose. Chris Tolson, Infrastructure Manager at a large online gambling company, said: ‘We would struggle to handle with our current bandwidth constraints and the hardware we have in place to fight an attack. It is vital that legitimate traffic continues to come through to our website even while we’re under attack and we do not know of anyone other than Prolexic who can ensure this with today’s increasingly strong and tenacious attacks,’ he added.
Keith Laslop, president of Prolexic said: ‘I’ve seen them on forums where you can hire bots for next to nothing.
http://www.pcpro.co.uk/security/news/98815/bt-to-make-ddos-mitigation-affordable.html