Sometimes admin appetite to ascendancy users HTTP requests through custmized ACL's or added scripts.
Mikrotik can be acclimated as PPPoE server area all PPPoE or audience on 192.168.0.0/23 arrangement are affiliated with Mikrotik anon through LAN.
Mikrotik with 3 interfaces
LAN (for clients)
WAN (for Internet)
eth1 (for Squid)
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Mikrotik simple view

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Squid

Squid accept 2 blazon of networks
LAN IP Abode 192.168.100.1/24 after any aperture or avenue address.
Just for LAN connectivity with Mikrotik eth1 with 192.168.100.2/24 IP Address
PPPoE conection for Internet through Mikrotik 'but' altered IP Abode 192.168.12.2 (normal audience IP abode 192.168.0.0/23)

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    Internet setup for Squid

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    Squid Internet access is working

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    Time to avenue audience cartage to abode 192.168.100.1 with audience on IP's with 192.168.0.0/23 range
    Disable NAT ( IP / Firewall / NAT / masquerade srcnat 192.168.0.0/23
    When accustomed applicant appeal for Internet to Mikrotik again Mikrotik all LAN arrangement 192.168.0.0/23 passthrow to Squid 192.168.100.1 absolute after any delay.


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    Example: Any appeal from 192.168.0.0/23 arrangement (with acquisition mark client), Mikrotik avenue this appeal to 192.168.100.1, and if addition arrangement appeal again Mikrotik avenue this appeal to WAN avenue 192.168.11.1.

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    Complete final view

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    but how to configure squid ?