iptables: No chain/target/match by that name. ls1021a

[jiye]

Hi,

Kernel Debian 4.19

When I perform

 iptables -A syn_flood

and

iptables -A port-scanning

It throws me error says:

iptables: No chain/target/match by that name.

i am not sure if this is kernel related. If so what is the name of the module should I use?

[alexander_yakov]

"-A" appends a rule to the specified chain. In your case chain names are specified "syn_flood" and "port-scanning". Error "No chain/target/match by that name" means there are no such chains, and they should be explicitly created before adding a rule to each of them. A new chain is created by "iptables -N chan_name".

This question is more related to iptables and its syntax, than to kernel.