RB750 as DDNS

RouterOS Scripting
1

Hello,
I would like to use my RB750 as NO-IP DDNS. I have read the following link:
http://wiki.mikrotik.com/wiki/Dynamic_DNS_Update_Script_for_No-IP_DNS

It is quite interesting that it is used for RB750 as a gateway of a network. But the RB750 at my home is not the gateway. :frowning:
The following is my home network structure:

Internet<---->RV042<---->SG100-24<---->RB750

See that? While the RB750 runs the script, the script will keep checking the fake IP (192.168.0.197), but not the WAN IP.
How can I fix it? Is there any way to rebuild the script? :confused:

Thank you. :smiley:

David

2

Ideally, you want to get the WAN IP directly from the RV042 router in some way. Does this device have FTP or SSH capabilities? The RB750 has the ability to send/receive FTP/SSH. If the RV042 is able to “export” the ip to a plain text file, or send it directly via SSH, then these might be possible.

Another solution is to use a service such as http://whatismyipaddress.com to get the public IP. The downside is it adds another failure point out of your control.

The first no-ip script could be changed to something like this (untested):

# No-IP automatic Dynamic DNS update

#--------------- Change Values in this section to match your setup ------------------

# No-IP User account info
:local noipuser "your_no-ip_user"
:local noippass "your_no-ip_pass"

# Set the hostname or label of network to be updated.
# Hostnames with spaces are unsupported. Replace the value in the quotations below with your host names.
# To specify multiple hosts, separate them with commas.
:local noiphost "hostname.no-ip.net"

#------------------------------------------------------------------------------------
# No more changes need

:global previousIP


# Get the current IP
/tool fetch url="http://bot.whatismyipaddress.com/" mode=http dst-path=pubIP.txt
:local currentIP [/file get pubIP.txt contents]

:if ($currentIP != $previousIP) do={
    :log info "No-IP: Current IP $currentIP is not equal to previous IP, update needed"
    :set previousIP $currentIP

# The update URL. Note the "\3F" is hex for question mark (?). Required since ? is a special character in commands.
    :local url "http://dynupdate.no-ip.com/nic/update\3Fmyip=$currentIP"
    :local noiphostarray
    :set noiphostarray [:toarray $noiphost]
    :foreach host in=$noiphostarray do={
        :log info "No-IP: Sending update for $host"
        /tool fetch url=($url . "&hostname=$host") user=$noipuser password=$noippass mode=http dst-path=("no-ip_ddns_update-" . $host . ".txt")
        :log info "No-IP: Host $host updated on No-IP with IP $currentIP"
    }
}  else={
    :log info "No-IP: Previous IP $previousIP is equal to current IP, no update needed"
}
3

Thank you skot. I think it is what I want. I tested it, but it doesn’t work. I am trying to fix it. :smiley: