远程端口抓包

1.8  Packet Capture典型配置举例

1.8.1  报文捕获配置举例

1. 组网需求

在设备的二层接口GigabitEthernet1/0/1上开启报文捕获功能。需要捕获接口GigabitEthernet1/0/1入方向上的、VLAN 3的、192.168.1.10到192.168.1.1以及192.168.1.11到192.168.1.1的所有软件转发报文和硬件转发报文。

2. 组网图

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3. 配置步骤

(1)     安装Packet Capture特性软件包，以便用户可以配置报文捕获功能

# 查看设备的版本信息，准备和设备当前运行的Boot包、System包兼容的Packet Capture特性软件包。

<Device> display version

H3C Comware Software, Version 7.1.070, Demo 01

Copyright (c) 2004-2018 New H3C Technologies Co., Ltd. All rights reserved.

H3C XXX uptime is 0 weeks, 0 days, 5 hours, 33 minutes

Last reboot reason : Cold reboot

Boot image: flash:/boot-01.bin

Boot image version: 7.1.070, Demo 01

  Compiled Oct 20 2016 16:00:00

System image: flash:/system-01.bin

System image version: 7.1.070, Demo 01

  Compiled Oct 20 2016 16:00:00

其它显示信息略……。

# 从IP地址为192.168.1.1的TFTP服务器上下载Packet Capture特性软件包packet-capture-01.bin。

<Device> tftp 192.168.1.1 get packet-capture-01.bin

Press CTRL+C to abort.

  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current

                                 Dload  Upload   Total   Spent    Left  Speed

100 11.3M    0 11.3M    0     0   155k      0 --:--:--  0:01:14 --:--:--  194k

Writing file...Done.

# 给IRF中的所有成员设备（此处以slot 1和slot 2为例）都安装Packet Capture特性软件包，并让该软件包在设备重启后能够继续生效。

<Device> install activate feature flash:/packet-capture-01.bin slot 1

Verifying the file flash:/packet-capture-01.bin on slot 1....Done.            

Identifying the upgrade methods....Done.                                       

Upgrade summary according to following table:                                  

flash:/packet-capture-01.bin                              

  Running Version             New Version                                      

  None                        Demo 01                                  

  Slot                        Upgrade Way                                       

  1                           Service Upgrade                                  

Upgrading software images to compatible versions. Continue? [Y/N]:y            

This operation might take several minutes, please wait....................Done.

<Device> install activate feature flash:/packet-capture-01.bin slot 2

Verifying the file flash:/packet-capture-01.bin on slot 2....Done.            

Identifying the upgrade methods....Done.                                       

Upgrade summary according to following table:                                  

flash:/packet-capture-01.bin                              

  Running Version             New Version                                       

  None                        Demo 01                                  

  Slot                        Upgrade Way                                       

  2                           Service Upgrade                                  

Upgrading software images to compatible versions. Continue? [Y/N]:y            

This operation might take several minutes, please wait....................Done.

<Device> install commit

This operation will take several minutes, please wait.......................Done.

# 重新登录设备，以便用户能够执行packet-capture interface和packet-capture read命令行。

(2)     在接口GigabitEthernet1/0/1的入方向上应用QoS策略，用来限制只捕获192.168.1.10到192.168.1.1、192.168.1.11到192.168.1.1的硬件转发报文。（二层接口上的大部分流量为硬件转发报文，对于硬件报文，需要镜像到CPU才能捕获；对于软件转发报文，不需要配置QoS策略，直接开启报文捕获功能即可）

# 创建IPv4高级ACL 3000，用来匹配192.168.1.10到192.168.1.1、192.168.1.11到192.168.1.1的报文。

<Device> system-view

[Device] acl advanced 3000

[Device-acl-ipv4-adv-3000] rule permit ip source 192.168.1.10 0 destination 192.168.1.1 0

[Device-acl-ipv4-adv-3000] rule permit ip source 192.168.1.11 0 destination 192.168.1.1 0

[Device-acl-ipv4-adv-3000] quit

# 定义流行为behavior1，配置流量镜向到CPU。

[Device] traffic behavior behavior1

[Device-behavior-behavior1] mirror-to cpu

[Device-behavior-behavior1] quit

# 定义类classifier1，匹配ACL3000。

[Device] traffic classifier classifier1

[Device-classifier-class1] if-match acl 3000

[Device-classifier-class1] quit

# 定义一个名为user1的策略，并在策略user1中为类classifier1指定采用流行为behavior1。

[Device] qos policy user1

[Device-qospolicy-user1] classifier classifier1 behavior behavior1

[Device-qospolicy-user1] quit

# 将策略user1应用到接口GigabitEthernet1/0/1的入方向上。

[Device] interface gigabitethernet 1/0/1

[Device-GigabitEthernet1/0/1] qos apply policy user1 inbound

[Device-GigabitEthernet1/0/1] quit

[Device] quit

(3)     开启报文捕获功能

# 开启GigabitEthernet1/0/1接口上的报文捕获功能，指定捕获报文个数上限为10，指定捕获的报文存入文件a.pcap。在192.168.1.10上使用Telnet方式登录192.168.1.1，创造报文捕获条件。

<Device> packet-capture interface gigabitethernet 1/0/1 capture-filter "vlan 3 and src 192.168.1.10 or 192.168.1.11 and dst 192.168.1.1" limit-captured-frames 10 write flash:/a.pcap

Capturing on "GigabitEthernet1/0/1"

10

4. 验证配置

# 在设备上解析报文文件flash:/a.pcap。

<Device> packet-capture read flash:/a.pcap

  1   0.000000 192.168.1.10 -> 192.168.1.1 TCP 62 6325 > telnet [SYN] Seq=0 Win=65535 Len=0 MSS=1460 SACK_PERM=1

  2   0.000061 192.168.1.10 -> 192.168.1.1 TCP 60 6325 > telnet [ACK] Seq=1 Ack=1 Win=65535 Len=0

  3   0.024370 192.168.1.10 -> 192.168.1.1 TELNET 60 Telnet Data ...

  4   0.024449 192.168.1.10 -> 192.168.1.1 TELNET 78 Telnet Data ...

  5   0.025766 192.168.1.10 -> 192.168.1.1 TELNET 65 Telnet Data ...

  6   0.035096 192.168.1.10 -> 192.168.1.1 TELNET 60 Telnet Data ...

  7   0.047317 192.168.1.10 -> 192.168.1.1 TCP 60 6325 > telnet [ACK] Seq=42 Ack=434 Win=65102 Len=0

  8   0.050994 192.168.1.10 -> 192.168.1.1 TCP 60 6325 > telnet [ACK] Seq=42 Ack=436 Win=65100 Len=0

  9   0.052401 192.168.1.10 -> 192.168.1.1 TCP 60 6325 > telnet [ACK] Seq=42 Ack=438 Win=65098 Len=0

 10   0.057736 192.168.1.10 -> 192.168.1.1 TCP 60 6325 > telnet [ACK] Seq=42 Ack=440 Win=65096 Len=0