默认 VLAN：10.36.0.0/24 新 VLAN：10.36.8.0/24 DHCP 服务器：10.36.0.17
我可以看到 DHCP 提供数据包返回到我的 VLAN IP 地址，即 10.36.8.31（来自 DHCP 服务器消息日志）
4 月 28 日 15:33:13 dhcpd：DHCPOFFER 从 10.36.8.129 到 10.36.8.31
但是 dhcp 请求从未返回到连接到新 vlan 的我的机器（也使用 wireshark 进行了验证）
交换机是 HP Layer 3 Procurve
运行配置（删除了一些细节）
Running configuration:
*; J9588A Configuration Editor; Created on release #KA.15.17.0008
*module 1 type j9588y
module 2 type j9588x
-fault-finder broadcast-storm sensitivity high
fault-finder bad-driver sensitivity high
fault-finder bad-transceiver sensitivity high
fault-finder bad-cable sensitivity high
fault-finder too-long-cable sensitivity high
fault-finder over-bandwidth sensitivity high
fault-finder loss-of-link sensitivity high
fault-finder duplex-mismatch-hdx sensitivity high
fault-finder duplex-mismatch-fdx sensitivity high
fault-finder link-flap sensitivity high
jumbo ip-mtu 9000
power-over-ethernet redundancy n+1
qos tcp-port ipv4 22 priority 7
qos tcp-port ipv4 80 priority 1
qos tcp-port ipv4 443 priority 0
qos type-of-service diff-services
timesync sntp
sntp broadcast
sntp server priority 1 10.36.0.17
sntp server priority 2 10.36.0.18
no telnet-server
time daylight-time-rule western-europe
no web-management
web-management ssl
ip default-gateway 10.36.0.1
ip dns server-address priority 1 10.36.0.17
ip dns server-address priority 2 10.36.0.17
no ip ssh cipher aes128-cbc
no ip ssh cipher 3des-cbc
no ip ssh cipher aes192-cbc
no ip ssh cipher aes256-cbc
no ip ssh mac hmac-md5
no ip ssh mac hmac-sha1-96
no ip ssh mac hmac-md5-96
ip route 10.36.8.0 255.255.255.0 10.36.8.1
ip routing
snmp-server community "public" unrestricted
tls application web-ssl lowest-version tls1.2
tls application openflow lowest-version tls1.2
tls application syslog lowest-version tls1.2
tls application tr69 lowest-version tls1.2
aaa authentication ssh login public-key
oobm
ip address 10.36.0.35 255.255.255.0
exit
router rip
redistribute connected
exit
vlan 1
name "DEFAULT_VLAN"
no untagged 20-21
untagged 1-19,22-52
ip address 10.36.0.31 255.255.255.0
ip helper-address 10.36.0.17
ip igmp
exit
vlan 8
name "WiredUsers"
untagged 20
ip address 10.36.8.31 255.255.255.0
ip helper-address 10.36.0.17
ip igmp
exit
spanning-tree
关于为什么 DHCP 提供不能从 10.36.8.31 跳转到同一子网上的我的机器，有什么建议吗？
答案1
我认为您可能不需要为 10.36.8.0/24 网络定义显式路由，因为它是直接连接的网络。尝试删除该路由语句，然后查看路由表，看看是否有显示为直接连接或类似内容的 10.36.8.0 路由。我不熟悉 HP 交换机，因此我根据我对使用 Cisco 交换机的 VLAN 间路由的了解来判断。然后查看您的 DHCP 客户端是否获得 DHCP 分配的 IP 地址。
这是 Cisco 3560 交换机的输出。您会发现，我没有为我的 VLAN 明确定义路由语句，因为它们都是直接连接的。
Switch#sh ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is not set
10.0.0.0/16 is subnetted, 4 subnets
C 10.1.0.0 is directly connected, Vlan10
C 10.2.0.0 is directly connected, Vlan20
C 10.3.0.0 is directly connected, Vlan30
C 10.4.0.0 is directly connected, Vlan40
Switch#sh run
Building configuration...
Current configuration : 1504 bytes
!
version 12.2
no service timestamps log datetime msec
no service timestamps debug datetime msec
no service password-encryption
!
hostname Switch
!
!
!
!
!
ip routing
!
!
!
!
!
!
!
!
!
!
no spanning-tree vlan 1,10,20,30,40
!
!
!
!
interface FastEthernet0/1
switchport access vlan 10
switchport mode access
!
interface FastEthernet0/2
switchport access vlan 20
switchport mode access
!
interface FastEthernet0/3
switchport access vlan 30
switchport mode access
!
interface FastEthernet0/4
!
interface FastEthernet0/5
!
interface FastEthernet0/6
!
interface FastEthernet0/7
!
interface FastEthernet0/8
!
interface FastEthernet0/9
!
interface FastEthernet0/10
!
interface FastEthernet0/11
!
interface FastEthernet0/12
!
interface FastEthernet0/13
!
interface FastEthernet0/14
!
interface FastEthernet0/15
!
interface FastEthernet0/16
!
interface FastEthernet0/17
!
interface FastEthernet0/18
!
interface FastEthernet0/19
!
interface FastEthernet0/20
!
interface FastEthernet0/21
!
interface FastEthernet0/22
!
interface FastEthernet0/23
!
interface FastEthernet0/24
switchport access vlan 40
switchport mode access
!
interface GigabitEthernet0/1
!
interface GigabitEthernet0/2
!
interface Vlan1
no ip address
shutdown
!
interface Vlan10
ip address 10.1.0.1 255.255.0.0
!
interface Vlan20
ip address 10.2.0.1 255.255.0.0
!
interface Vlan30
ip address 10.3.0.1 255.255.0.0
!
interface Vlan40
ip address 10.4.0.1 255.255.0.0
!
ip classless
!
!
!
!
!
!
!
line con 0
line vty 0 4
login
!
!
!
end
Switch#