https://www.machform.com/forums/ MachForm Community Forums Topic: Anybody using Limit One Entry per IP feature? en Sun, 03 May 2026 18:35:03 +0000 https://www.machform.com/forums/topic/anybody-using-limit-one-entry-per-ip-feature#post-18117 Sun, 28 Apr 2013 04:24:17 +0000 Steve1951 18117@https://www.machform.com/forums/ <p>Searching the net I found that using $_SERVER["HTTP_X_FORWARDED_FOR"] instead of $_SERVER["HTTP_ADDR"] will deliver the real IP address of the user if he is behind a proxy. But will it work also if users are connecting through the same router (e.g. WIFI)???</p> <p>It should not work if the client is behind a router or a firewall. See the link below if you want to test it.</p> <p><a href="http://www.schuckman.us/test/test_get_ip.php" rel="nofollow">http://www.schuckman.us/test/test_get_ip.php</a> </p> https://www.machform.com/forums/topic/anybody-using-limit-one-entry-per-ip-feature#post-18105 Thu, 25 Apr 2013 17:37:00 +0000 Giorgio 18105@https://www.machform.com/forums/ <p>Searching the net I found that using $_SERVER["HTTP_X_FORWARDED_FOR"] instead of $_SERVER["HTTP_ADDR"] will deliver the real IP address of the user if he is behind a proxy. But will it work also if users are connecting through the same router (e.g. WIFI)??? </p> https://www.machform.com/forums/topic/anybody-using-limit-one-entry-per-ip-feature#post-18103 Thu, 25 Apr 2013 16:42:04 +0000 Giorgio 18103@https://www.machform.com/forums/ <p>Thank you Steve. Isn't there another unique identifier that could be used instead of $_Server['remote_address'], that would work also in case of wifi, firewall or proxyserver? Maybe a better solution would be to use cookies to check if someone has already submitted a form? What do you think? </p> https://www.machform.com/forums/topic/anybody-using-limit-one-entry-per-ip-feature#post-18070 Mon, 22 Apr 2013 02:08:57 +0000 Steve1951 18070@https://www.machform.com/forums/ <p>Giorgio - you are correct. Everyone who is using WI-FI from the same router will have the same IP Address. The same is true in a corporate environment behind a firewall if they are using NAT (almost all corporations do). Everyone behind the corporate firewall will have the same IP address (as viewed from the public Internet). Obviously everyone internally will have different IP addresses. </p> https://www.machform.com/forums/topic/anybody-using-limit-one-entry-per-ip-feature#post-18067 Sun, 21 Apr 2013 21:42:04 +0000 erzon 18067@https://www.machform.com/forums/ <p>if client using wifi.. it should deploy different IP address... I used limit IP per entry to avoid duplicate entry.. I don't have any problem </p> https://www.machform.com/forums/topic/anybody-using-limit-one-entry-per-ip-feature#post-18065 Sun, 21 Apr 2013 15:23:27 +0000 Giorgio 18065@https://www.machform.com/forums/ <p>Hi everybody</p> <p>I've made a test and it seems to me that if more clients use the same WI-FI connection to submit a form, all this submissions will have the same IP address. This means that the Limit One Entry per IP feature can't be used in this case. Do you have any experience with that? I have already written to Yuniar to ask his opinion but in the meantime I wanted to ask also the community... thx </p>