各位大大，望解惑

[root@izm5eb7o9hu1q8eoh3zi68z ~]# ifconfig

eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>? mtu 1500

? ? ? ? inet 172.31.153.255? netmask 255.255.240.0? broadcast 172.31.159.255

? ? ? ? ether 00:16:3e:05:25:9e? txqueuelen 1000? (Ethernet)

? ? ? ? RX packets 2171? bytes 271711 (265.3 KiB)

? ? ? ? RX errors 0? dropped 0? overruns 0? frame 0

? ? ? ? TX packets 1378? bytes 178314 (174.1 KiB)

? ? ? ? TX errors 0? dropped 0 overruns 0? carrier 0? collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>? mtu 65536

? ? ? ? inet 127.0.0.1? netmask 255.0.0.0

? ? ? ? loop? txqueuelen 1? (Local Loopback)

? ? ? ? RX packets 0? bytes 0 (0.0 B)

? ? ? ? RX errors 0? dropped 0? overruns 0? frame 0

? ? ? ? TX packets 0? bytes 0 (0.0 B)

? ? ? ? TX errors 0? dropped 0 overruns 0? carrier 0? collisions 0

[root@izm5eb7o9hu1q8eoh3zi68z ~]#

[root@izm5eb7o9hu1q8eoh3zi68z ~]# route -n

Kernel IP routing table

Destination? ? ?Gateway? ? ? ? ?Genmask? ? ? ? ?Flags Metric Ref? ? Use Iface

0.0.0.0? ? ? ? ?172.31.159.253? 0.0.0.0? ? ? ? ?UG? ? 0? ? ? 0? ? ? ? 0 eth0

169.254.0.0? ? ?0.0.0.0? ? ? ? ?255.255.0.0? ? ?U? ? ?1002? ?0? ? ? ? 0 eth0

172.31.144.0? ? 0.0.0.0? ? ? ? ?255.255.240.0? ?U? ? ?0? ? ? 0? ? ? ? 0 eth0

[root@izm5eb7o9hu1q8eoh3zi68z ~]#

[root@izm5eb7o9hu1q8eoh3zi68z ~]#

[root@izm5eb7o9hu1q8eoh3zi68z ~]#

[root@izm5eb7o9hu1q8eoh3zi68z ~]#

[root@izm5eb7o9hu1q8eoh3zi68z ~]#

[root@izm5eb7o9hu1q8eoh3zi68z ~]# traceroute -n 115.195.81.196

traceroute to 115.195.81.196 (115.195.81.196), 30 hops max, 60 byte packets

?1? * * *

?2? 11.219.5.9? 10.455 ms? 10.519 ms 11.219.4.9? 5.686 ms

?3? * * *

?4? 11.219.68.34? 0.426 ms? 0.425 ms 11.219.68.50? 0.413 ms

信息如上所示，網卡IP和網關IP不在同一網段，那進行外部訪問的時候，數據走到網關172.31.159.253之前是不是還要經過在同一網段的交換機？或是通過其他方式連接至網關172.31.159.253？具體是什么邏輯呢