WAN connect and disconnect using script

[perla]

Hello everyone!

First of all, thank you Merlin for the great work and firmware!

I would like to ask for some help.
My question: Is it possible to connect/disconnect to/from the Internet by using a script?

I'm asking this because I have got a creepy cable modem. Twice or three times a day it does a restart (I think it looses the signal) and my Internet connection interrupts. My problem is that my router doesn't detect this restart and because I am using dynamic IP it doesn't initiate a reconnect automatically. I have to manually disconnect and then connect (through the admin page of the router) to have my Internet connection working again.

I think the perfect solution would be if I wrote a script that pings a webpage every 5 minutes (by using cron) and if the ping fails then it does an automatic disconnect and connect on the WAN interface.
Is it possible to write such a script? Can anybody help me in this?

Thank you very much for the help in advance.

 

[perla]

I did a small investigation regarding how the connect and disconnect command is sent to the router when the user is using the admin page.

The command is sent by using a POST request to the following page: /start_apply2.htm
The requested status (on/off) of the WAN interface is in the following form: name=internetForm
Input field: name=wan_enable; value = 1 or 0

Is it possible to generate this kind of POST request (containing the requested WAN status in the wan_enable field) by using wget?

I can not belive that there is no way to reach this WAN status changing feature by using a simple function call available in the firmware...

 

[RocketJSquirrel]

My *nix is pretty rusty, so forgive me if this is way off. But shouldn't this be as simple as

ifconfig eth0 down
sleep 5
ifconfig eth0 up

 

[RMerlin]

service restart_wan

 

[HorstG]

Hello.
Where do I type this one please?
Can one in a batch file?

Thank you

 

[RMerlin]

You have to connect to the router through either SSH or Telnet, and type that command on the command line.

 

[perla]

Thanks RMerlin!

I will test this command on the weekend to see if it can solve my problem.
However, according to HorstG question, I hope that this command will also work in a batch file called by a cronjob.

 

[RMerlin]

Thanks RMerlin!

I will test this command on the weekend to see if it can solve my problem.
However, according to HorstG question, I hope that this command will also work in a batch file called by a cronjob.

Sure. Any shell command can also be run through a cron job or a shell script.

 

[HorstG]

Hi Merlin
Do you have maybe a tutorial to create a reconnect cronjob?

It is very difficult for me with English.

Thank you

Horst

 

[RMerlin]

Hi Merlin
Do you have maybe a tutorial to create a reconnect cronjob?

It is very difficult for me with English.

Thank you

Horst

There are instructions on the Github Wiki. I also posted more details on how to configure it in various posts on these forums - try a forum search on "cronjob" or something like that.

 

[HorstG]

Hi I have searched the forums and cron job but because my English is very bad
I could not find anything real. Can send me the links or a guide please someone?
Is it possible éventuel via batch file?

Thanks again Horst

 

[steom]

service restart_wan

@RMerlin
how to trigger a wan reconnect with curl?
thanks

 

[RMerlin]

@RMerlin
how to trigger a wan reconnect with curl?
thanks

You can't. There's no public REST API, as those are nothing but security nightmares anyway (ask Linksys...).

 

[QMax]

Mmmm... not sure what's happening here...
I'm trying to use service command in a batch script to restart wan when pyload needs a new IP address.
service restart_wan works fine if used with putty, but if I run a basic .sh script:

#!/bin/sh
service restart_wan

this is the result:

-sh: ./: Permission denied

 

[mstombs]

...

-sh: ./: Permission denied

Make sure your file is created with unix line endings, with ssh enabled you can edit files from windows PC using winscp and notepad++ ....

 

[RMerlin]

Make it executable:

chmod a+rx script.sh

 

[QMax]

Thanks for your replies, file is created by nano, but the problem was in cut/paste from Windows...

 

[steom]

You can't. There's no public REST API, as those are nothing but security nightmares anyway (ask Linksys...).

@RMerlin
and with the UPNP urn schemas is possible to trigger a reconnect?
i need a command to execute a wan ip change from windows.
thanks

 

[RMerlin]

@RMerlin
and with the UPNP urn schemas is possible to trigger a reconnect?
i need a command to execute a wan ip change from windows.
thanks

No idea, but if there were, I'd consider that a security hole in needs of fixing, since UPnP is completely unauthenticated.

 

[steom]

@RMerlin
there is a faster method for renew wan ip other than 'service restart_wan'?
thanks