As a network administrator, you are tasked with setting up firewall rules for your company$$s internal network. The network includes several different types of hosts including a web server, an FTP server, and employee workstations. The IP addresses for these services are as follows:

$*$ Web server: $192\mathrm{.}168\mathrm{.}1\mathrm{.}5$

$*$ FTP server: $192\mathrm{.}168\mathrm{.}1\mathrm{.}6$

$*$ Employee workstations: $192\mathrm{.}168\mathrm{.}1\mathrm{.}100-192\mathrm{.}168\mathrm{.}1\mathrm{.}200$

$*$ Assumptions

$-$ The external network interface is named eth$0.$

$-$ The internal network interface is named eth$1.$

Create firewall rules to meet the following requirements:

$1.$ Allow all external traffic to the web server on port $80$ and $443$ only.

$2.$ Block all access to the FTP server from outside the network.

$3.$ Allow employee workstations to access the internet on port $80$ and $443.$

$4.$ Block all incoming traffic from external sources to employee workstations except email traffic on port $25.$

Provide the firewall rules in a format used by a common firewall system like iptables or a similar system. Include any assumptions you make about the network configuration.