I have a question.
I just want to understand this.
Why it is not possible to mark packet BEFORE "route selection" in OUTPUT chain.
And then choose route by mark
Then change source ip
And then send it to destination
Instead of this packet enter "route selection" where it SHOULD hit default route, otherwise it will never enter "-t mangle -A OUTPUT".
Default route changes it source ip.
"-t mangle -A OUTPUT" adds a mark
Then another "route selection" checks for marked route and redirects packet to appropriate interface, BUT doesn't change source ip (also why?)
Then "-t nat -A POSTROUTNG" changes source ip.
My question is why we can't mark packet BEFORE first "route selection", then choose routing table by mark, then change source ip, and send
packet to interface.
Thank you for explanations.
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