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edited Apr 4, 2022 at 7:08

iptables. I have went though the manual of Iptables and known some basic concepts, e.g. chain, table, hook, rule and targets. In the Linux ecosystem, iptables is a widely used firewall tool that interfaces with the kernel’s netfilter packet filtering framework.
route table. In Linux, there is another table route table.

I am trying to figure out the relation between them and put them in one big picture.

Here is a nice diagram to show the flow of iptables, there are two routingroute stages. in which step, will kernel take advantage of "route table"? the route step?

Reference

DigitalOcean: A Deep Dive into Iptables and Netfilter Architecture
I have read this question "StackOverflow: What's the difference between iptables vs route?", but it didn't answer my question.

iptables. I have went though the manual of Iptables and known some basic concepts, e.g. chain, table, hook, rule and targets. In the Linux ecosystem, iptables is a widely used firewall tool that interfaces with the kernel’s netfilter packet filtering framework.
route table. In Linux, there is another table route table.

I am trying to figure out the relation between them and put them in one big picture.

Here is a nice diagram to show the flow of iptables, there are two routing stages. in which step, will kernel take advantage of "route table"? the route step?

Reference

DigitalOcean: A Deep Dive into Iptables and Netfilter Architecture
I have read this question "StackOverflow: What's the difference between iptables vs route?", but it didn't answer my question.

iptables. I have went though the manual of Iptables and known some basic concepts, e.g. chain, table, hook, rule and targets. In the Linux ecosystem, iptables is a widely used firewall tool that interfaces with the kernel’s netfilter packet filtering framework.
route table. In Linux, there is another table route table.

I am trying to figure out the relation between them and put them in one big picture.

Here is a nice diagram to show the flow of iptables, there are two route stages. in which step, will kernel take advantage of "route table"?

Reference

DigitalOcean: A Deep Dive into Iptables and Netfilter Architecture
I have read this question "StackOverflow: What's the difference between iptables vs route?", but it didn't answer my question.

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asked Apr 4, 2022 at 4:21

Ryan Lyu

During the lifecycle of "iptables", in which step, will kernel take advantage of "route table"?

iptables. I have went though the manual of Iptables and known some basic concepts, e.g. chain, table, hook, rule and targets. In the Linux ecosystem, iptables is a widely used firewall tool that interfaces with the kernel’s netfilter packet filtering framework.
route table. In Linux, there is another table route table.

I am trying to figure out the relation between them and put them in one big picture.

Here is a nice diagram to show the flow of iptables, there are two routing stages. in which step, will kernel take advantage of "route table"? the route step?

Reference

DigitalOcean: A Deep Dive into Iptables and Netfilter Architecture
I have read this question "StackOverflow: What's the difference between iptables vs route?", but it didn't answer my question.