>[оверквотинг удален]
> http_access deny all
> http_port 3128 transparent
> cache_dir ufs /var/spool/squid 1000 16 256
> coredump_dir /var/spool/squid
> cache_mem 2000 MB
> delay_pools 1
> delay_class 1 2
> delay_parameters 1 125000/125000 125000/125000
> delay_access 1 allow test
> delay_access 1 deny all

Правила

-A PREROUTING -p tcp -m tcp -i eno1.107 --dport 80 -j REDIRECT --to-ports 3128

-A POSTROUTING -o eno1.1245 -j MASQUERADE

eno1.107 - локальная сеть
eno1.1245 - внешний инт.