Can squid Transparent Proxy listen to the http port directly? And without IPtables

[Henry Yuan <forwardmy@xxxxxxxxx>]

Hi,

I'm wondering whether you can set the http_port to be 80 in the
squid.conf file to make squid work as a transparent proxy without
IPtable.

In other words, is configuring the squid machine as an NAT router an
requirement for it to work?
( I'm doing a squid experiment for a course project. The course offers
a network testbed, but we don't have root access on those machines.
And IPtable is not available either.)

Thanks,
Henry