DNS

xbsoftware.com

104.236.135.127

hosts file and DNS servers

ftp://ftp.internic.net/domain/named.root

resolv.conf

DNS requests

• direct
• reverse
• recurrent

Demo

DNS cache poisoning

Use known dns servers

External libs

Subresource Integrity

https://developer.mozilla.org/en-US/docs/Web/Security/Subresource_Integrity

Security?

DNSsec

<link rel="dns-prefetch" href="//example.com">

Questions?