Is it possibile to install openvpn in a router with only 4mb flash without extroot? I have a mr3420 v3 and i have to use the usb 3/4 g module. I've read the tutorial about installing extroot in the sdcard of 3g dongle but my usb dongle can't do the prerequisites configuration. I'm trying to remove some packages from the .bin file but i don't know wich packages i can delete. I've tried another solution, install openvpn directly on ram but i failed because i can't install kmod-tun zlib liblzo. I've found them this work-around in this link:
just google openvpn ram 4mb, the first link
Someone have a solution or is it impossible?

There is installation to RAM: https://tokyobreeze.wordpress.com/2015/ … 4mb-flash/
Try to install initially these packages: kmod-tun, zlib, liblzo.
Try to remove LuCI from your firmware to get space.

(Last edited by ulmwind on 2 Oct 2017, 16:27)

4 MB flash devices typically only offer 32 MB RAM, trying to install additional packages into tmpfs on those devices would be fatal, as their RAM situation is marginal during normal operations already

I'm trying to build my own image. Wich packages i can delete except luci? For openvpn working i need almost 149kb of free space, i need to install only 2 files, openvpn-openssl and luci-app-openvpn.
This is my software list at the moment: pastebin . com/PyAC1sCs
Package for usb and 3/4G are indispensable

(Last edited by Kalamaius on 3 Oct 2017, 16:35)

If you're going to use with one specific modem, delete the drivers that it doesn't use.  Most 4G modems present themselves as an Ethernet device with an IP address, they don't "dial up" like 3G modems with chat and ppp.  The ppp related stuff is rather large.

(Last edited by mk24 on 3 Oct 2017, 17:05)