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I have problems with understanding this topic.
I understand iptables packet flow as well as well as kernel hooks.
Do not take into account iptables rules, just net.ipv4.ip_forward enabled and iptables empty.
Consider host with two NICs. First is in 192.168.0.0/24 network, second - 10.10.0.0/24.
Packet comes to the first NIC with IP 10.10.0.3.
My question is how kernel determines where to route packet ?
Does it just check routing table and thats all ? If it finds routing entry that corresponds to this address than it takes NIC name and forwards this packet to the specific NIC ? Which is stored in /proc/net/route but really in the kernel RAM ?
But if there is no such route it checks NIC(interfaces) that maybe one of them has specific IP even with network route entry in the table ?
Am I right ?
fyfdzbgz
Posted 2016-10-31T07:38:53.593
Reputation: 21