Forward Web trafic to other host with IPTABLES

commands.sh

sudo iptables -t nat -A PREROUTING -j DNAT -p tcp --dport 80  --to {{HOST}}:80
sudo iptables -t nat -A PREROUTING -j DNAT -p tcp --dport 443 --to {{HOST}}:443
### Explanation
# iptables [-t table] -[AD] chain rule-specification [options]
# table:
#   `-t nat`           - We want the rules to apply to the "nat" table; to the
#                        first packets of a connection
# operation:
#   `-A`               - We want to append the rule
# chain:
#   `PREROUTING`       - We want to alter incomming packages, this is the chain
#                        for that
# rule-specification:
#   `-j DNAT`          - If rules applies, this and all future packets in this
#                        connection should not be processed by other rules and
#                        will be forwarded as specified
#   `-p tcp`           - Do this for tcp packets
#   `--dport 80`      - Do this for packets with destination port 80
#   `--to {{HOST}}:80` - Forward to port 80 at HOST

sudo iptables -A FORWARD -j ACCEPT -p tcp -d {{HOST}} --dport 80 
sudo iptables -A FORWARD -j ACCEPT -p tcp -d {{HOST}} --dport 443
### Explanation
# iptables [-t table] -[AD] chain rule-specification [options]
# table:
#   ``            - If none is specified the default table `filter` is used
# operation:
#   `-A`          - We want to append the rule
# chain:
#   `FORWARD`     - We want to handle packets being routed through the "box"
# rule-specification:
#   `-j ACCEPT`   - If the rules apply, all packets will be passed on as is
#   `-p tcp`      - Do this for tcp packets
#   `-d {{HOST}}` - Do this for packets with destination HOST
#   `--dport 80`  - Do this for packets with destination port 80