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We already learned that packet goes into in-interface, the router determines that it is an IP packet and need to be routed, and here starts the complicated process:

1.  The packet enters prerouting processing:
   1. check if there is a hotspot and modify the packet for hotspot use
   2. process packet through RAW prerouting chain;
   3. send the packet through connection tracking;
   4. process packet through Mangle prerouting chain;
   5.  process packet through NATs dst-nat chain;
2. Run packet through routing table to make routing decision;
3. The packet enters forward process;
   1. check TTL value;
   2. process packet through Mangle forward chain;
   3. process packet through Filter forward chain;
   4. send the packet to accounting processes;
      
      
4. A packet enters postrouting process;
   1. process packet through Mangle postrouting chain;
   2. process packet through NATs src-nat chain;
   3. if there is a hotspot undo any modifications made in hotspot-in;
   4. process packet through queue tree (HTB Global);
   5. process packet through simple queues;
      
      
5. Check if there is IPsec and then process through IPsec policies;