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I recently bought a D-Link DIR-822 router and I can telnet into it and issue Linux commands. The thing is, say I issued random commands like;

iptables -P FORWARD DROP
iptables -I INPUT -p tcp --sport 23 -j DROP

It works, but after reboot, everything goes back/changes to default. I tried editing the /etc/hosts file as well for some ad blocking, but it just changes back to default on reboot.

There's of course OpenWrt that could do the job right, but I was wondering if it was possible to do it on the stock firmware version.

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    Can you find out more about the linux version the thing is running? Does it have a /etc/lsb-release file? Or anything *release* under /etc?
    – tink
    Commented Sep 24, 2022 at 0:04
  • Did you try normal unix-y things like seeing which filesystems are mounted read-only vs. read/write, and see if you can remount them read/write? Or look into which filesystems are RAM-based vs. flash-based?
    – Spiff
    Commented Sep 24, 2022 at 2:32
  • @tink fun fact there are no /etc/lsb-release file
    – randomuser
    Commented Sep 25, 2022 at 0:59

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