I created an access point (on a raspberrypi3, jessie), which I can properly connect to. Now I want to let devices open up automatically a splash page (hosted on localhost) after connecting to my hotspot. The access point will never forward any traffic in the future, so I'm Ok with blocking all traffic in the rules.
From Redirecting Request on Device in Access Point Mode & diff. tutorials I believe that this can be done with iptables. The devices open up the splash page, if they cannot access some page they originally want to open (I'm not sure with this).
iptables
*nat
:PREROUTING ACCEPT [3:522]
:INPUT ACCEPT [3:522]
:OUTPUT ACCEPT [0:0]
:POSTROUTING ACCEPT [0:0]
-A PREROUTING -p tcp -m tcp --dport 80 -j DNAT --to-destination 127.0.0.1:80
-A PREROUTING -p tcp -m tcp --dport 443 -j DNAT --to-destination 127.0.0.1:80
COMMIT
*filter
:INPUT ACCEPT [1176:83156]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [1114:81204]
COMMIT
iptables -t nat -nvL :
Chain PREROUTING (policy ACCEPT 19 packets, 2156 bytes)
pkts bytes target prot opt in out source destination
0 0 DNAT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:80 to:127.0.0.1:80
0 0 DNAT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:443 to:127.0.0.1:80
Chain INPUT (policy ACCEPT 19 packets, 2156 bytes)
pkts bytes target prot opt in out source destination
Chain OUTPUT (policy ACCEPT 1 packets, 48 bytes)
pkts bytes target prot opt in out source destination
Chain POSTROUTING (policy ACCEPT 1 packets, 48 bytes)
pkts bytes target prot opt in out source destination
Question
How can I configure the iptables (what else is required) to have a splash page popping up by devices, after connecting.
