fedora 4 network 설정에 대한 질문.

tintin25의 이미지

fedora 4에서 ifconfig 결과.

eth0      Link encap:Ethernet  HWaddr 00:04:23:AB:E3:10
          inet addr:192.168.1.253  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::204:23ff:feab:e310/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:2206 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1763 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:242843 (237.1 KiB)  TX bytes:1137064 (1.0 MiB)
          Base address:0x8000 Memory:f0200000-f0220000
 
eth1      Link encap:Ethernet  HWaddr 00:04:23:AB:E2:18
          inet addr:192.168.1.252  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::204:23ff:feab:e218/64 Scope:Link
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:25 errors:25 dropped:0 overruns:0 carrier:25
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 b)  TX bytes:2241 (2.1 KiB)
 
eth2      Link encap:Ethernet  HWaddr 00:E1:80:02:EC:71
          inet addr:192.168.1.242  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::2e1:80ff:fe02:ec71/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:613 errors:0 dropped:0 overruns:0 frame:0
          TX packets:31 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:71764 (70.0 KiB)  TX bytes:2679 (2.6 KiB)
          Interrupt:21 Base address:0x9000
 
lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:77 errors:0 dropped:0 overruns:0 frame:0
          TX packets:77 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:25143 (24.5 KiB)  TX bytes:25143 (24.5 KiB)

물리적으로 eth0에 해당하는 포트에 케이블이 연결되어 있을때만 통신됩니다.
그리고 eth1, eth2에 해당하는 아이피로 ssh를 접근해도 eth0에 해당하는 랜포트에 케이블이 연결되어 있을때는 접근이 가능합니다.
이유를 잘 모르겠습니다. 가르쳐주세요.