[Question] Possible bug in iptables?

Asked by Michal Dziczkowski on 2021-06-04

Hello. I experience a strange iptables behaviour, described bellow. I would be happy for help in solving it or advises about the next steps to be taken.


I attempted to add a global rule (without any assigned IP address) with following commands:

`iptables -t raw -A PREROUTING -m connntrack --ctstate NEW -j UPDATE`

or (when the above wasn't working):

`iptables -v -t raw -A PREROUTING -p tcp -j UPDATE`, where (in both cases) UPDATE is an created before custom chain.

Each time I receiving following output message:

* in the first case:

`UPDATE all opt -- in * out * -> ctstate NEW
iptables: No chain/target/match by that name.

* in the second case:

`UPDATE tcp opt -- in * out * ->
iptables: No chain/target/match by that name.

**System informations:**

* OS: Ubuntu 20.04

* uname -a:

`Linux live 5.4.0-53-generic #59-Ubuntu SMP Wed Oct 21 09:38:44 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux`

* lsb_relaease -a:

`No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 20.04.1 LTS
Release: 20.04
Codename: focal

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Ubuntu iptables Edit question
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Launchpad Janitor (janitor) said :

This question was expired because it remained in the 'Open' state without activity for the last 15 days.

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Michal Dziczkowski (mdziczkowski) said :

Error still actual

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