How to setup a dns server that filters web traffic

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?
al4629740Asked:
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Sajid Shaik MSr. System AdminCommented:
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
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Patrick BogersDatacenter platform engineer LindowsCommented:
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.
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al4629740Author Commented:
Basically how does opendns able to use dns to block or filter web traffic
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Patrick BogersDatacenter platform engineer LindowsCommented:
It cannot.
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al4629740Author Commented:
So then how does it get done?
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Patrick BogersDatacenter platform engineer LindowsCommented:
Webcontent filtersoftware like ISA servers
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