# \[SOLVED\] Run a custom script as a cronjob with specific WAN interface? **URL:** \ **Category:** Router\ **Created:** [March 23, 2023, 5:19am UTC](https://forum.gl-inet.com/t/solved-run-a-custom-script-as-a-cronjob-with-specific-wan-interface/28297 "2023-03-23T05:19:05Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![msdos](https://forum-assets.gl-inet.com/letter_avatar_proxy/v4/letter/m/43a26b/32.png) [@msdos](https://forum.gl-inet.com/u/msdos)\ **Post date:** [March 23, 2023, 5:19am UTC](https://forum.gl-inet.com/t/solved-run-a-custom-script-as-a-cronjob-with-specific-wan-interface/28297/1 "2023-03-23T05:19:05Z")
I’m planning to buy GL-MT3000 to use it’s multi-wan feature with a Huawei E3276 and a 4G chip in my country as a fallback. I can buy a sms chip of 150GB, but I need to use it at least once in a month or my credits will expire. I would like to know if it’s possible, by scripting in a cronjob, download everyday a 1mb file from somewhere using this wan. Should I be reading [[OpenWrt Wiki] Write shell scripts in OpenWrt](https://openwrt.org/docs/guide-developer/write-shell-script) and [[OpenWrt Wiki] Scheduling tasks with cron](https://openwrt.org/docs/guide-user/base-system/cron) to accomplish this task? ---
**Author:** ![hansome](https://forum-assets.gl-inet.com/letter_avatar_proxy/v4/letter/h/b5ac83/32.png) [@hansome](https://forum.gl-inet.com/u/hansome)\ **Post date:** [March 23, 2023, 2:17pm UTC](https://forum.gl-inet.com/t/solved-run-a-custom-script-as-a-cronjob-with-specific-wan-interface/28297/2 "2023-03-23T14:17:09Z")
You can use the curl command to download from certain WAN, from repeater interface: ```auto curl -I --interface wlan-sta0 http://example.com/file-to-download ``` And integrate this into your shell and crontab configs. That should work. ---
**Author:** ![msdos](https://forum-assets.gl-inet.com/letter_avatar_proxy/v4/letter/m/43a26b/32.png) [@msdos](https://forum.gl-inet.com/u/msdos)\ **Post date:** [March 23, 2023, 6:12pm UTC](https://forum.gl-inet.com/t/solved-run-a-custom-script-as-a-cronjob-with-specific-wan-interface/28297/3 "2023-03-23T18:12:45Z")
Trying in a macbook with a valid interface: `curl -I --interface en0 https://www.africau.edu/images/default/sample.pdf -O` Trying with an invalid interface: ```auto curl -I --interface wlan-sta0 https://www.africau.edu/images/default/sample.pdf -O curl: (45) Couldn't bind to 'wlan-sta0' # Returns 1, showing it failed ``` Trying with a valid interface, but offline: ```auto curl -I --interface en0 https://www.africau.edu/images/default/sample.pdf -O % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0curl: (6) Could not resolve host: www.africau.edu # Returns 1, showing it failed ``` It seems robust enough if the curl from openwrt have the --interface feature. I can integrate some logic to correctly monitor this using [https://healthchecks.io](https://healthchecks.io) notifications. ---
**Author:** ![msdos](https://forum-assets.gl-inet.com/letter_avatar_proxy/v4/letter/m/43a26b/32.png) [@msdos](https://forum.gl-inet.com/u/msdos)\ **Post date:** [March 23, 2023, 6:17pm UTC](https://forum.gl-inet.com/t/solved-run-a-custom-script-as-a-cronjob-with-specific-wan-interface/28297/4 "2023-03-23T18:17:34Z")
If somehow curl in openwrt doesn’t have this feature, another solution is to create a script that uses [ubus call](https://openwrt.org/docs/techref/ubus#call). In a script: - Use ubus call to [call down all interfaces](https://openwrt.org/docs/guide-developer/ubus/network); - Use ubus call to call up only the 4G interface; - Download the file; - Call down all the interfaces and call it up all again. …or, create a hotplug script (docs/guide-user/base-system/hotplug#iface) that downloads the file and put the commands above in a cron. It depends on preference. ---
**Author:** ![anon38652312](https://forum-assets.gl-inet.com/letter_avatar_proxy/v4/letter/a/90db22/32.png) [@anon38652312](https://forum.gl-inet.com/u/anon38652312)\ **Post date:** [March 24, 2023, 12:12am UTC](https://forum.gl-inet.com/t/solved-run-a-custom-script-as-a-cronjob-with-specific-wan-interface/28297/5 "2023-03-24T00:12:20Z")
This is currently working on the Slate and used for speed test: [SmoothWAN-feeds/wanspeedtest at main · SmoothWAN/SmoothWAN-feeds · GitHub](https://github.com/SmoothWAN/SmoothWAN-feeds/blob/main/speedifyconf/net/usr/bin/wanspeedtest) ---
**Author:** ![bruce](https://forum-assets.gl-inet.com/user_avatar/forum.gl-inet.com/bruce/32/35649_2.png) [@bruce](https://forum.gl-inet.com/u/bruce)\ **Post date:** [October 29, 2025, 4:21am UTC](https://forum.gl-inet.com/t/solved-run-a-custom-script-as-a-cronjob-with-specific-wan-interface/28297/6 "2025-10-29T04:21:22Z")