How DynDNS detect the WAN IP ?

[shreckbull]

Hello !

The WAN of my pfsense is behind a modem/router with router mode on, i can't put it in bridge mode.

With port forwarding or DMZ from modem to pfsense, there is no problem and the system is as with a modem in bridge mode.

I want to know how (wich process) that the "dyndns client" in pfsense use to detect the public IP :
-Does it just take the WAN IP ? (i think)
-Does it read a .conf file ?
-Does it read public IP form an obselete URL ?

I want to modify this process to use a whatismyip URL witch return a raw value (if you know : http://www.whatismyip.fr/raw/) …

Si the question is : how is detected the public IP ?

[cmb]

The WAN IP is used. There is no other option at this time.

[shreckbull]

after multiples searchs in pfsense files, i have not find the function used to use the WAN ip for do updates …

i haven't localised the function "update dyndns" ...

does anybody know where locate it ?

[sullrich]

/etc/inc/dyndns.class

[shreckbull]

Thank !

I will modifi the definition of WAN_IP …

[shreckbull]

simply create a php file and put it on public webserver (with php support) :

echo $_SERVER[REMOTE_ADDR];
?>

And modify : /etc/inc/dyndns.class
Replace this :

$wan_ip = get_current_wan_address();

By this :

$filename = "HTTP://YOUR_WEBSERVER_URL/YOUR_FILE.PHP";
$handle = fopen ($filename, "r");
$wan_ip = fread ($handle, 20);
fclose ($handle);

If you want, you can create a function with this code and call it (do not forget the  "return;" at the end of function).