So thats 1-0 to the worm! You could do some real cool things if you were controlling the DNS for a site under a major sustained DDoS, who doesnt the intended victim like.. just fire up an A record and they're gone! ;p Btw I'm seeing www.caldera.com disappear into Level3, seems theyre down. Steve On Sun, 1 Feb 2004, Rubens Kuhl Jr. wrote:
Just drop the www.sco.com DNS record, as they did... this particular worm goes after the URL, not the IP it usually had.
nslookup www.sco.com
*** can't find www.sco.com: Non-existent domain
nslookup www.caldera.com
Non-authoritative answer: Name: www.caldera.com Address: 216.250.128.12
Rubens
----- Original Message ----- From: <Valdis.Kletnieks@vt.edu> To: "Rubens Kuhl Jr." <rubens@email.com> Cc: <hackerwacker@cybermesa.com>; <nanog@merit.edu> Sent: Sunday, February 01, 2004 9:09 PM Subject: Re: Did Wanadoo, French ISP, block access to SCO?
On Sun, 01 Feb 2004 20:00:40 -0200, "Rubens Kuhl Jr." <rubens@email.com> said:
And by blackholing that IP they've also blackholed www.caldera.com, which
is
currently not a DDoS target but is also not respondig to requests.
Umm,, I'll bite. If www.sco.com and www.caldera.com are on the same IP, how do you create a DDoS that wouldn't take out the Caldera site as well?
A sheer-traffic DDoS will hurt both. A synflood will hurt both.
The webserver that's listening on port 80 doesn't know which site is being connected to until it actually reads in the HTTP/1.1 headers and looks at the Host: tag - and if there's enough things arriving with 'Host: www.sco.com', it will require some *very* creative filtering/limiting to keep one website working while the other is down....