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Unfortunately, I can't install iptables properly:

The installation command runs through normally, but then I get an error.

Tried on a virgin flashed System: openpli-8.0-rc on Maxytec Multibox Combo.

Mentioned in passing, not problem relevant: on first uprgade process there are some errors as well:

opkg update && opkg upgrade

Collected errors:
 * remove_obsolesced_files: unlinking /lib/modules/4.4.35/extra/hi_play.ko failed: No such file or directory.
 * opkg_install_pkg: Failed to determine obsolete files from previously installed maxytec-dvb-modules-multibox
 

Back to iptables, the opkg install iptables result looks pretty normal: https://pastebin.com/XGR2sYmR

But even a simple listing right after installation gives me following error:

root@multibox:~# iptables -L
iptables v1.8.3 (legacy): can't initialize iptables table `filter': Table does not exist (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
 

Further, the module can't be found:

root@multibox:~# modprobe ip_tables
root@multibox:~# modinfo ip_tables
modinfo: ERROR: Module ip_tables not found.
root@multibox:~# lsmod
Module                  Size  Used by
mali                  274279  0
multibox             6297130  22
multibox_3            429442  22 mali,multibox
multibox_2             23808  0
multibox_1              6460  3 multibox_2,multibox_3,multibox

Some more information:

root@multibox:~# cat /proc/net/ip_tables_matches
icmp
udplite
udp
tcp
root@multibox:~# cat /proc/net/ip_tables_names
root@multibox:~# cat /proc/net/ip_tables_targets
ERROR

root@multibox:~# ls /lib/modules/4.4.35/kernel/net/
mac80211  rfkill    wireless
 

In another forum they wrote this happens because of missing kernel modules?

I saw on github that CONFIG_NETFILTER_XTABLES is activated, but all the other CONFIG_NETFILTER_XT_... are not.

According to that it is not possible to use iptables on this box?

Or did I just forget anything?