Access Control list to setup firewall internal to our network

We have a Police Department network which accesses services such as email, internet, file sharing/printing from the City Hall network.  I want to setup a firewall in such a way that the Police Department can access everything on the City Hall network.  I want nobody except the servers at City Hall be able to talk to servers at Police Department.

The Police Department is connected to City Hall using a fiber trunk.

The Police Department network is 172.22.0.0 and there gateway interface to City hall is 172.22.9.1

The City Hall network is 10.0.0.0 network.

Any help with a sample access list will greatly help.
rwcstaffAsked:
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Sean64Connect With a Mentor Commented:
Here's a simple ACL (assuming all servers reside on 10.255.x.x subnetwork.
It would be helpfull to know what the subnet masks are at each site, as well as what type of firewall you're using to provide a better answer.

PERMIT 10.255.0.0 255.255.0.0 172.22.0.0 255.255.0.0
DENY ALL

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tang_tzuchiConnect With a Mentor Commented:
Hi,

Beside the ACL provided by Sean64, you can add another statement for all traffic Police Department to City Hall network:

PERMIT 172.22.0.0 255.255.0.0 10.0.0.0 255.0.0.0
PERMIT 10.255.0.0 255.255.0.0 172.22.0.0 255.255.0.0
DENY ALL
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rwcstaffAuthor Commented:
Thanks Sean64 and Tang tzuchi.  Sean64, you had a question about the subnet mask on both sides.  It is 255.255.0.0.  Having said that will the ACL you are suggesting still valid.  Thanks.
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