Reply to post: Re: DDoS

Hundreds of millions of Broadcom-based cable modems at risk of remote hijacking, eggheads fear

big_D Silver badge

Re: DDoS

DDoS generally uses magnification attacks, they send a small packet upstream, which causes the recipient to send a lot of data to the spoofed IP address.

You send a simple request of a few bytes up to, for example, an NTP server, asking for a list of information and you provide it with a spoofed answer address. Your few bytes upstream turn into anything up to megabytes in return information aimed at the site you are DDoSing. Therefore 200 million modems with limited upstream capability can still cause terabyte sized DDoS attacks.

POST COMMENT House rules

Not a member of The Register? Create a new account here.

  • Enter your comment

  • Add an icon

Anonymous cowards cannot choose their icon

SUBSCRIBE TO OUR WEEKLY TECH NEWSLETTER

Biting the hand that feeds IT © 1998–2020