I'm wondering if it is possible to do routing using iptables only, without using ip_forwarding flag in kernel.
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No. IPTables is for firewalling and other packet mangling, which is a separate function from forwarding.
Furthermore, routing is different than forwarding.
Tero Kilkanen
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But How about this article? https://scalingo.com/blog/iptables – Vahid Hashemi Sep 30 '21 at 21:56
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What about that article makes you think you don't need forwarding enabled? – Zoredache Oct 01 '21 at 00:53
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unless the mentioned article is incorrect at all. – Vahid Hashemi Oct 01 '21 at 07:44