=== 실패한 규칙 제거 ===
제거완료

=== raw 테이블 PREROUTING 에 넣는다 — conntrack 보다 먼저 실행된다 ===
  netfilter 순서: raw PREROUTING → conntrack → mangle → nat → filter
Chain PREROUTING (policy ACCEPT 0 packets, 0 bytes)
num   pkts bytes target     prot opt in     out     source               destination         
1        0     0 DROP       6    --  *      *       0.0.0.0/0            10.42.1.77           tcp dpt:57800
2        0     0 DROP       6    --  *      *       0.0.0.0/0            10.42.1.77           tcp dpt:7800
  주입: 12:32:35

=== [검증] 이번엔 패킷이 걸렸는가 ===
  Chain PREROUTING (policy ACCEPT 0 packets, 0 bytes)
   pkts bytes target     prot opt in     out     source               destination         
      0     0 DROP       6    --  *      *       0.0.0.0/0            10.42.1.77           tcp dpt:57800
      0     0 DROP       6    --  *      *       0.0.0.0/0            10.42.1.77           tcp dpt:7800