How to setup a dns server that filters web traffic

al4629740
al4629740 used Ask the Experts™
on
How is it possible to filter web traffic through a dns server.   How does opendns do it?  Are they using a product like barracuda? How does filtering get setup?
Comment
Watch Question

Do more with

Expert Office
EXPERT OFFICE® is a registered trademark of EXPERTS EXCHANGE®
Commented:
first of all DNS server will never filter any traffic ... it's function is just name to ip  and ip to name conversion...

the remaining task is the part of firewall ... which block ports etc.

now a days firewalls becomes Unified devices... which will having name specific content filtering...

for example xxx, porn... etc... which will find and blocks.

but actually a utm provider  (for example  Sonicwall/Cyberoam/Barracuda) will monitoring the internet traffic and collecting signatures over the internet  and when they found any signature which looks like virus or spam they immediately updates to its database..

this database will replicates to your Devise (UTM/Antispam) and updates Daily wise...

in the appliance the data packets received from out side it'll check these signatures and allows the data...

if any bad signature found it'll block or junk as per the policy..


thanks and regards
Patrick BogersDatacenter platform engineer Lindows

Commented:
Hi

Not 100% what you mean by 'filter web traffic through a dns server'

If it means filtering email, you could setup MX records in DNS to pass incoming mail to a hardware spamfilter host which e.g. can use Barracuda appliances.
After filtering this service will forward you the filtered email.

If this is not what you mean please reply with more clear explaination.

Author

Commented:
Basically how does opendns able to use dns to block or filter web traffic
Angular Fundamentals

Learn the fundamentals of Angular 2, a JavaScript framework for developing dynamic single page applications.

Patrick BogersDatacenter platform engineer Lindows

Commented:
It cannot.

Author

Commented:
So then how does it get done?
Datacenter platform engineer Lindows
Commented:
Webcontent filtersoftware like ISA servers

Do more with

Expert Office
Submit tech questions to Ask the Experts™ at any time to receive solutions, advice, and new ideas from leading industry professionals.

Start 7-Day Free Trial