hello to all
sir i want to block all ads to my clients pc using mikrotik hotspot server.
kindly solve my problem.
thank you all.

If you have server or vps on Internet install squid on rare port (not 8080 or default 3128) and use on hotspot options and enable transparent proxy on user profile

Biladele is extension for Squid proxy that block ads (include adblock plus filters), and other content type (pornographic, etc.).

http://www.quintolabs.com/

In case, MTs DNS is flexible enough, and you are happy with "brutal" blockage of ads, you can create
something like this:
......
zone "pagead2.googleadservices.com" { type master; notify no; file "/etc/null_zone"; };
zone "www.google-analytics.com" { type master; notify no; file "/etc/null_zone"; };
.....

null_zone:
; NULL Zone File for Ad Servers
;
$TTL 36000
@ in soa localhost. postmaster.localhost. (
2002110101 ;serial
3600 ;refresh
1800 ;retry
604800 ;expiration
3600 ) ;minimum

;
; Zone NS records
;

@ NS localhost.

A 127.0.0.1
* IN A 127.0.0.1




Or use squid-proxy (transparent) on a small PC running linux, which also might be part of your network. Caching is additional benefit.

sir can you give me all ads block scripts which i paste in new terminal

Here's a few I have with RouterOS 6.10

/ip firewall filter
add chain=forward action=reject reject-with=tcp-reset protocol=tcp content=doubleclick comment="doubleclick"
add chain=forward action=reject reject-with=tcp-reset protocol=tcp content=adverts comment="adverts"
add chain=forward action=reject reject-with=tcp-reset protocol=tcp content=adserver comment="adserver"
add chain=forward action=reject reject-with=tcp-reset protocol=tcp content=ads.ak.facebook.com comment="Facebook Ads"
add chain=forward action=reject reject-with=tcp-reset protocol=tcp content=counter comment="Counter ads"
add chain=forward action=reject reject-with=tcp-reset protocol=tcp content=banners comment="banners Ads"

Using DROP hangs but forward seems to end quicker.

Hello i am doing isp in guyana and using alot of mikrotik device using dhcp server but my problem is on my clients devices loading alot of ads while browsing using more bandwidth. Can anyone help me out please i am using a mikrotik rb750

Working f9 for me thanks

also found putting a static DNS entry to loopback for ad specific domain to be very effective.
e.g.
/ip dns static
add address=127.0.0.1 regexp=googlesyndication*

http://stopad.generate.club/

Works wonders for me

http://stopad.generate.club/

Now it's here: https://stopad.kplus.pro
https://github.com/tarampampam/mikrotik-hosts-parser