Is it possible to make an ordinary Wifi router out of an ADSL Wifi router [email protected] 2804 MTS?

Question

network hardware

Good evening, dear Khabrovites!
I had a problem setting up the MTS router F @ st 2804 ( info ). It is necessary to make the device work in the mode of a regular Wifi router, i.e. distributed the Internet coming to Eth1, for example.
There is a router MTS F @ st 2804 (Connectors: ADSL, Eth1-4, USB for 3G modem).
You can telnet to the router. List of available commands:

help logout exit quit reboot adsl xtm brctl cat loglevel logdest virtualserver ddns df dumpcfg dumpmdm dm meminfo syslog psp echo ifconfig kill ping ps pwd sntp sysinfo tftp wlctl arp defaultgateway dhcpserver dns lan lanhosts passwd ppp restoredefault route save swversion wan<br/>

Here are the instructions for the router:
Setup
instructions Another instruction
Full instructions
It's not entirely clear how to make it distribute the Internet from Eth1, for example. It is clear that this function is not reflected in the documentation of the router, but it seems to me that there must be some way. Maybe someone already has a ready solution or idea? Please write if you have encountered this before, maybe links to some proven manuals for such a router setup.
Thank you!

Answer 1

sysctl -w net.ipv4.ip_forward="1"
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
Accordingly, you need to put iptables there first. And a kernel that supports the ipv4.forward option.

Answer 2

I'm afraid that, like on most SOHO Routers, instead of full-fledged network interfaces, there is a regular 4-port switch, visible to the piece of iron as ONE logical interface.
Of course, purely theoretically, you can pervert, register 2 IP addresses on it, and NAT from one to the other. But this hardly goes beyond a purely theoretical framework :)
Of course, I could be wrong, but I'm 99% sure that this cannot be done using standard tools, if there are alternative firmware - there may be a chance.