allowing incoming http access-linux firewall

[s_hcl]

I have linux iptables firewall on red hat 9.0 .

I have a linux apache server on a private ip 192.168.0.5.I need to access the server from outside via our public ip.

i have given the following code.

WEB_SRV=192.168.0.5

#Incoming HTTP Requests:
iptables -t nat -A PREROUTING -i $EXTR -p tcp --dport 80 -j DNAT --to-destination $WEB_SRV:80
iptables -t nat -A PREROUTING -i $EXTR -p udp --dport 80 -j DNAT --to-destination $WEB_SRV:80

I ran the iptables with the above code ,but it dosen't output any error.

any inputs please

[s_hcl]

EXTR=public ip