我正在寻找为什么 Wireshark 中的数据包捕获不包含 DHCP 提供消息的答案。我试图直接在安装了 Wireshark 的计算机上捕获数据包并执行 SPAN 监控端口。
在这两种情况下，我都无法在以下屏幕上看到 DHCP 提供：
我在 MacOS Mojave 上使用 Wireshark 2.6.4。
下面是一个简单的拓扑图：
下面是交换机配置：
interface Vlan47
ip address x.x.x.1 255.255.255.0
!
interface Vlan49
ip address x.x.x.1 255.255.255.0
ip helper-address x.x.x.55
!
SPAN monitor destination interface
switchport access vlan 21
switchport mode access
switchport nonegotiate
switchport block unicast
no logging event link-status
access-session port-control auto
mab
dot1x pae authenticator
dot1x timeout tx-period 3
storm-control broadcast level 2.00
storm-control multicast level 5.00
storm-control action trap
spanning-tree portfast
service-policy type control subscriber policy_name
ip dhcp snooping limit rate 100
!
SPAN monitor source port
switchport access vlan 49
switchport mode access
switchport nonegotiate
switchport block unicast
switchport port-security maximum 2
switchport port-security maximum 1 vlan access
switchport port-security violation restrict
switchport port-security aging time 2
switchport port-security aging type inactivity
switchport port-security
no logging event link-status
mab
dot1x pae authenticator
dot1x timeout tx-period 3
access-session port-control force-authorized
storm-control broadcast level 2.00
storm-control multicast level 5.00
storm-control action trap
spanning-tree portfast
service-policy type control subscriber policy_name
ip verify source
ip dhcp snooping limit rate 100
!
DHCP server port
interface Port-channel1
switchport trunk allowed vlan 47,70
switchport mode trunk
switchport nonegotiate
switchport block unicast
ip arp inspection trust
ip arp inspection limit rate 100
logging event link-status
storm-control broadcast level 5.00
storm-control multicast level 10.00
storm-control action trap
ip dhcp snooping limit rate 1000
ip dhcp snooping trust
!
!
sh monit sess all
Session 1
---------
Type : Local Session
Source Ports :
Both : SPAN source port
Destination Ports : SPAN dst port
Encapsulation : Native
Ingress : Disabled
!
!
