概括
昨天，八个系统中的四个（连接到相同的 VLAN，相同的以太网适配器设置）能够 ping tweakers.net。今天，另一个系统无法 ping 互联网了。
由于系统站点已被广泛调查，因此可能怀疑 Cisco 交换机并对其进行了分析（请参阅Switch analysis section问题），但问题仍然存在。
问题：当某些系统可以 ping 互联网而其他系统不能 ping 时，可以执行哪些进一步的步骤来调试，而以太网适配器是相同的并且它们连接到相同的 VLAN？
开关分析
ARP
Switch>sh arp
Protocol Address Age (min) Hardware Addr Type Interface
Internet 10.10.10.2 147 Y ARPA VlanNum
MAC地址表
Switch>sh mac address-table
Mac Address Table
-------------------------------------------
Vlan Mac Address Type Ports
---- ----------- -------- -----
Num Y DYNAMIC Gi0/Z
虚拟局域网
Switch>sh vl
VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active
Num VLAN0Num active Gi0/Z
VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2
---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------
1 enet ... 1500 - - - - - 0 0
Num enet ... 1500 - - - - - 0 0
Remote SPAN VLANs
------------------------------------------------------------------------------
Primary Secondary Type Ports
------- --------- ----------------- ------------------------------------------
运行配置
Switch>sh run
interface GigabitEthernet0/Z
switchport access vlan Num
switchport mode access
switchport nonegotiate
!
IP接口
Switch>sh ip int br
Interface IP-Address OK? Method Status Protocol
Vlan1 X YES NVRAM up up
VlanNum 10.10.10.1 YES NVRAM up up
GigabitEthernet0/Z unassigned YES unset up up
界面
Switch>show interface Gi0/Z
GigabitEthernet0/Z is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is MAC (bia MAC)
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 1000Mb/s, media type is 10/100/1000BaseTX
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 669
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 248000 bits/sec, 34 packets/sec
5 minute output rate 516000 bits/sec, 51 packets/sec
6069964 packets input, 2943921646 bytes, 0 no buffer
Received 99 broadcasts (56 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 56 multicast, 88133 pause input
0 input packets with dribble condition detected
8562995 packets output, 4951152227 bytes, 0 underruns
0 output errors, 0 collisions, 1 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 PAUSE output
0 output buffer failures, 0 output buffers swapped out