sudo iptables -vnL -t nat
sudo iptables -vnL -t nat –line-numbers
!
sudo iptables -t nat -D POSTROUTING 2
sudo iptables -A POSTROUTING 2 -t nat -s 192.168.1.0/255.255.255.0 -d 80.74.22.151 -j hml
sudo iptables -I POSTROUTING 11 -t nat -s 195.110.181.74 -d 172.20.0.0/16 -j ACCEPT
!
sudo iptables -I POSTROUTING -s 1.1.1.1 -d 2.2.2.2 -j ACCEPT
sudo iptables -I POSTROUTING -s 120.1.1.1/255.255.255.224 -o eth2 -j SNAT –to-source 1.1.1.1
!
!

When we have a linux vm solution in place :

Postrouting on VM through to Cisco Device…

sudo iptables -I POSTROUTING  -s 80.74.22.64/255.255.255.224 -d 109.231.196.34 -j ACCEPT

Cisco Router: on WAN IP = 80.74.22.64/32

ip nat inside source static tcp 172.16.24.1 5631 interface dialer 0 5631
ip nat inside source static udp 172.16.24.1 5632 interface dialer 0 5632
!
ip access-list extended 111
permit udp host 109.231.196.34 any eq 5632
permit tcp host 109.231.196.34 any eq 5631