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Replies

DHCP relay issue

filip00011
Level 1
Level 1

I have a problem with DHCP. I have the catalyst 3560g. Computers who are directly connected to the vlan 10 cannot obtain ip address. Computers in vlan 1 can get IP.

i also have WLC 4402 connected to the catalyst 3560g. With different WLANs. Wireless devices in vlan 10 can get ip address. thorugh DHCP server on vlan 1. 

When i disabled DHCP proxy in WLC dhcp didnt work. What do i need to change on my switch?


hostname C3560
!
boot-start-marker
boot-end-marker
!
no logging console
enable secret 5 $1$UFpf$1zwItmb5zL5mRaFu51cJF/
!
!
!
no aaa new-model
system mtu routing 1500
ip routing
no ip domain-lookup
ip dhcp relay information trust-all
!
!
!
!
crypto pki trustpoint TP-self-signed-214823424
enrollment selfsigned
subject-name cn=IOS-Self-Signed-Certificate-214823424
revocation-check none
rsakeypair TP-self-signed-214823424
!
!
crypto pki certificate chain TP-self-signed-214823424
certificate self-signed 01
3082023C 308201A5 A0030201 02020101 300D0609 2A864886 F70D0101 04050030
30312E30 2C060355 04031325 494F532D 53656C66 2D536967 6E65642D 43657274
69666963 6174652D 32313438 32333432 34301E17 0D393330 33303130 30303134
305A170D 32303031 30313030 30303030 5A303031 2E302C06 03550403 1325494F
532D5365 6C662D53 69676E65 642D4365 72746966 69636174 652D3231 34383233
34323430 819F300D 06092A86 4886F70D 01010105 0003818D 00308189 02818100
C5AB3596 7D342FCA DF08A8FF BD505354 FB177242 A749840E F55D44CE 1FB8314E
27EB7D42 9BCF35B3 C5EF77A0 4B928586 0BB6E779 C0076085 8962CE1C F7AFD5AD
7CBA8D9F ECE649C3 A25EA650 45BE2E71 F9274EB9 029D5C17 94F16A6D 30873A75
A28AE0CA 3BAEC577 170160A9 7802ECEC 573BD16E A0B0C824 8D0A1886 0DB63B47
02030100 01A36630 64300F06 03551D13 0101FF04 05300301 01FF3011 0603551D
11040A30 08820643 33353630 2E301F06 03551D23 04183016 8014835C 0A2AAD8B
EE00D3EA F832BC50 53998B9B 7B73301D 0603551D 0E041604 14835C0A 2AAD8BEE
00D3EAF8 32BC5053 998B9B7B 73300D06 092A8648 86F70D01 01040500 03818100
7C49C789 5DD44A6F 315AEC87 5418D4C8 25B1C206 16D5E7E7 F179C740 6EE65E53
27B445B9 F8FC61B7 5EF1AAC6 016645D1 2E08F006 CC69B9FD 22130A91 426FC1F3
306078AF 1D0C3BEB 711A5A34 C080E091 7BB78800 F56C82E4 17241E18 127EB2A2
A88A0D44 4F26EF79 CF8C94AE 6CD91FE0 756626A0 84DBF900 CAA59800 EFC169CD
quit
!
!
!
spanning-tree mode pvst
spanning-tree portfast default
spanning-tree extend system-id
!
vlan internal allocation policy ascending
!
!
!
!
interface GigabitEthernet0/1
no switchport
ip address 10.10.10.2 255.255.255.0
!
interface GigabitEthernet0/2
switchport trunk encapsulation dot1q
switchport mode trunk
!
interface GigabitEthernet0/3
switchport trunk encapsulation dot1q
switchport mode trunk
!
interface GigabitEthernet0/4
!
interface GigabitEthernet0/5
!
interface GigabitEthernet0/6
!
interface GigabitEthernet0/7
!
interface GigabitEthernet0/8
!
interface GigabitEthernet0/9
!
interface GigabitEthernet0/10
!
interface GigabitEthernet0/11
!
interface GigabitEthernet0/12
!
interface GigabitEthernet0/13
!
interface GigabitEthernet0/14
!
interface GigabitEthernet0/15
!
interface GigabitEthernet0/16
!
interface GigabitEthernet0/17
!
interface GigabitEthernet0/18
!
interface GigabitEthernet0/19
!
interface GigabitEthernet0/20
!
interface GigabitEthernet0/21
!
interface GigabitEthernet0/22
!
interface GigabitEthernet0/23
!
interface GigabitEthernet0/24
switchport access vlan 10
switchport mode access
!
interface GigabitEthernet0/25
!
interface GigabitEthernet0/26
!
interface GigabitEthernet0/27
!
interface GigabitEthernet0/28
!
interface Vlan1
ip address 192.168.200.1 255.255.255.0
!
interface Vlan5
ip address 192.168.5.1 255.255.255.0
!
interface Vlan10
ip address 192.168.10.1 255.255.255.0
ip helper-address 192.168.200.12
!
interface Vlan20
ip address 192.168.20.1 255.255.255.0
ip helper-address 192.168.200.12

2 Replies 2

devils_advocate
Level 7
Level 7

Can you provide the results of the following command on the switch:

#show ip arp 192.168.200.12

What type of device is 192.168.200.12? Is it a Windows Server running DHCP?

Thanks

Mathias Garcia
Level 1
Level 1

If you configure a static IP on one of the computers on vlan 10, is it able to communicate with devices on vlan1?

I'm wondering if you might have a trunking issue, on what port are the vlan 10 computers connected? And via which port do you reach the DHCP server.

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