p2p vs browser

RouterOS General
1

Hi all

How come blocking p2p makes transparent proxy ineffective on the browser? I have to maunally put proxy ip address with port no. before I can access certain sites.Is this just my network or its a general problem?
Any suggestions?

2

show us your blocking rules please

3

This ai all I have on my blocking rules

ip firewall filter
add chain=input connection-state=invalid action=drop
comment=“Drop Invalid connections”
add chain=input connection-state=established action=accept
comment=“Allow Established connections”
add chain=input protocol=udp action=accept
comment=“Allow UDP”
add chain=input protocol=icmp action=accept
comment=“Allow ICMP”
add chain=input src-address=192.168.1.0/24 action=accept
comment=“Allow access to router from known network”
add chain=input action=drop comment=“Drop anything else”