默认mtu 在 Linux 上检查网络连接的更多方法(3)

6 ash-b1-link.telia.net (80.239.161.69) 41.612 ms 28.214 ms 29.573 ms

7 xe-1-3-1.er1.iad10.us.zip.zayo.com (64.125.13.157) 30.429 ms 27.915 ms 29.065 ms

8 ae6.cr1.dca2.us.zip.zayo.com (64.125.20.117) 31.353 ms 32.413 ms 33.821 ms

9 ae27.cs1.dca2.us.eth.zayo.com (64.125.30.246) 43.474 ms 44.519 ms 46.037 ms

10 ae4.cs1.lga5.us.eth.zayo.com (64.125.29.202) 48.107 ms 48.960 ms 50.024 ms

11 ae8.mpr3.bos2.us.zip.zayo.com (64.125.30.139) 51.626 ms 51.200 ms 39.283 ms

12 64.124.51.229.t495-rtr.towerstream.com (64.124.51.229) 40.233 ms 41.295 ms 39.651 ms

13 69.38.149.18 (69.38.149.18) 44.955 ms 46.210 ms 55.673 ms

14 64.119.137.154 (64.119.137.154) 56.076 ms 56.064 ms 56.052 ms

15 world.std.com (192.74.137.5) 63.440 ms 63.886 ms 63.870 ms

tcptraceroute 命令

tcptraceroute 命令与 traceroute 基本上是一样的，只是它能够绕过最常见的防火墙的过滤。正如该命令的手册页所述，tcptraceroute 发送 TCP SYN 数据包而不是 UDP 或 ICMP ECHO 数据包，所以其不易被阻塞。

tcpdump 命令

tcpdump 命令允许你捕获网络数据包来进一步分析。使用 -D 选项列出可用的网络接口。

$ tcpdump -D

1.eth0 [Up, Running]

2.any (Pseudo-device that captures on all interfaces) [Up, Running]

3.lo [Up, Running, Loopback]

4.nflog (Linux netfilter log (NFLOG) interface)

5.nfqueue (Linux netfilter queue (NFQUEUE) interface)

6.usbmon1 (USB bus number 1)

7.usbmon2 (USB bus number 2)

8.usbmon3 (USB bus number 3)

9.usbmon4 (USB bus number 4)

10.usbmon5 (USB bus number 5)

11.usbmon6 (USB bus number 6)

12.usbmon7 (USB bus number 7)

-v 选项控制你看到的细节程度——越多的 v，越详细，但超过 3 个 v 不会有更多意义。

$ sudo tcpdump -vv host 192.168.0.32

tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 262144 bytes

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