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PRIMARY LINKS


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 * Check My DNS
 * Member Portal
 * Mitigating DNS Denial of Service Attacks

2023-06-01: This service has been deprecated in favor of Check My DNS.

US-CERT's Vulnerability Note VU#800113 describes deficiencies in the DNS
protocol and implementations that can facilitate cache poisoning attacks. The
answers from a poisoned nameserver cannot be trusted. You may be redirected to
malicious web sites that will try to steal your identity or infect your
computers with malware. Working exploits for this issue are already widely
circulated! Upgrade your nameservers ASAP if you haven't done so already!
Additional details about these poisoning attacks are available in Dan Kaminsky's
post of August 7, 2008.

The essence of the problem is that DNS resolvers don't always use enough
randomness in their transaction IDs and query source ports. Increasing the
amount of randomness increases the difficulty of a successful poisoning attack.

This page exists to help you learn if your ISP's nameservers are vulnerable to
this type of attack. If you click on the button below, we will test the
randomness of your ISP DNS resolver.

The test takes a few seconds to complete. When its done you'll see a page where
the transaction ID and source port randomness will be rated either GREAT, GOOD,
or POOR. If you see a POOR rating, we recommend that contact your ISP and ask if
they have plans to upgrade their nameserver software.

See porttest for another way to check your resolver from a Unix commandline.


QUICK LINKS

Joining and Participating in DNS-OARC

OARC 44, Hybrid, Atlanta

OARC 43, Hybrid, Prague

DNS Community Day, Colombia

OARC Past Events

DNS-OARC Workshop Presentation Videos

OARC on LinkedIn, GitHub, Mastodns.net, Facebook, Instagram

Latest OARC Blog Posts

Mitigating DNS Denial of Service Attacks

DNS-OARC Conduct Policy



Contacting OARC


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