iptables: Operation not supported.

[mister_v]

I upgraded my debian version to buster
and no iptables doesn't work.

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iptables: Operation not supported.

Anyone know how to fix this ?

[Chris]

with the update iptables is "deconfigured"
The following command allows you to select an alternative

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sudo update-alternatives --config iptables

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[root@localhost ~]# update-alternatives --config iptables
There are 2 choices for the alternative iptables (providing /usr/sbin/iptables).

  Selection    Path                       Priority   Status
------------------------------------------------------------
* 0            /usr/sbin/iptables-nft      20        auto mode
  1            /usr/sbin/iptables-legacy   10        manual mode
  2            /usr/sbin/iptables-nft      20        manual mode

Press <enter> to keep the current choice[*], or type selection number: 1
update-alternatives: using /usr/sbin/iptables-legacy to provide /usr/sbin/iptables (iptables) in manual mode

note: if you forwarded ports, you need to set it up again.

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echo 1 > /proc/sys/net/ipv4/ip_forward