NAT / Port Forwarding with iptables firewall [duplicate]
Solution 1:
Thanks, the tip to search for "Hairpin NAT" helped me to solve my problem. For other interested users here are the rules that did the magic:
iptables -t nat -A PREROUTING -d $EXT_IP -p tcp --dport 443 -j DNAT --to-destination $OFFICE
iptables -t nat -A POSTROUTING -s $INT_NET -d $SERVER-p tcp --dport 443 -j SNAT --to-source $FIREWALL
Thanks for your help!