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06-15-2016 11:52 PM
06-15-2016 11:52 PM
Problem with DHCP beetween subnets/VLAN in HP 2530-48G
0Hi:
I configured HP 2530 with 2 VLANS (VALN 2 and VLAN3).
There is a linux server acting as a router with two network interfaces (one in VLAN 2 with IP 192.168.20.1 and the other in VLAN 3 with IP 192.168..30.1). There isn´t any filtered traffic, only ip fordwarding.
The network address are:
VLAN 2 (192.168.20.0/24)
VLAN 3 (192.168.30.0/24)
In this scenario, everything works fine. I placed some workstations in both VLANs/subnets and there isn´t any connectivity problem.
Now, I configured a DHCP server placed in VLAN2 (with IP 192.168.20.200). It has two scopes:
SCOPE 1: 192.168.20.2 – 192.168.20.5 with default gateway 192.168.20.1 (for worksrtations in VLAN 2)
SCOPE 2: 192.168.30.2 – 192.168.30.5 with default gateway 192.168.30.1 (for worksrtations in VLAN 3)
Only workstations in VLAN 2 get address from DHCP server.
This is the switch configuration:
ip default-gateway 192.168.20.1
vlan 1
name "DEFAULT_VLAN"
no untagged 1-30
untagged 31-52
no ip address
exit
vlan 2
name "VLAN2”
untagged 1-15
ip address 192.168.20.201 255.255.255.0
exit
vlan 3
name "VLAN3"
untagged 16-30
ip address 192.168.30.201 255.255.255.0
ip helper-address 192.168.20.200
exit
There isn´t any connectivity problem. For example, I can ping from a workstation in VLAN 3 (static IP address 192.168.30.30) to DHCP Server (192.168.20.200) and from DHCP server (192.168.20.200) to any workstation in VLAN 3 (192.168.30.30, for example). But DHCP isn´t working for VLAN 3 (only works for VLAN 2)
Could someone please help me?.
Best Regards
- Tags:
- DHCP
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06-16-2016 03:55 AM
06-16-2016 03:55 AM
Re: Problem with DHCP beetween subnets/VLAN in HP 2530-48G
This is a capture with Wireshark. It seens like DHCP server gives 192.168.30.3.
No. Time Source Destination Protocol Length Info
1 0.000000 0.0.0.0 255.255.255.255 DHCP 342 DHCP Discover - Transaction ID 0x61cd03c
Frame 1: 342 bytes on wire (2736 bits), 342 bytes captured (2736 bits)
Ethernet II, Src: DellInc_af:34:52 (00:15:c5:af:34:52), Dst: Broadcast (ff:ff:ff:ff:ff:ff)
Internet Protocol Version 4, Src: 0.0.0.0 (0.0.0.0), Dst: 255.255.255.255 (255.255.255.255)
User Datagram Protocol, Src Port: 68 (68), Dst Port: 67 (67)
Bootstrap Protocol (Discover)
Message type: Boot Request (1)
Hardware type: Ethernet (0x01)
Hardware address length: 6
Hops: 0
Transaction ID: 0x061cd03c
Seconds elapsed: 0
Bootp flags: 0x0000 (Unicast)
0... .... .... .... = Broadcast flag: Unicast
.000 0000 0000 0000 = Reserved flags: 0x0000
Client IP address: 0.0.0.0 (0.0.0.0)
Your (client) IP address: 0.0.0.0 (0.0.0.0)
Next server IP address: 0.0.0.0 (0.0.0.0)
Relay agent IP address: 0.0.0.0 (0.0.0.0)
Client MAC address: DellInc_af:34:52 (00:15:c5:af:34:52)
Client hardware address padding: 00000000000000000000
Server host name not given
Boot file name not given
Magic cookie: DHCP
Option: (53) DHCP Message Type (Discover)
Length: 1
DHCP: Discover (1)
Option: (116) DHCP Auto-Configuration
Length: 1
DHCP Auto-Configuration: AutoConfigure (1)
Option: (61) Client identifier
Length: 7
Hardware type: Ethernet (0x01)
Client MAC address: DellInc_af:34:52 (00:15:c5:af:34:52)
Option: (50) Requested IP Address
Length: 4
Requested IP Address: 169.254.168.171 (169.254.168.171)
Option: (12) Host Name
Length: 8
Host Name: D1MBXN2J
Option: (60) Vendor class identifier
Length: 8
Vendor class identifier: MSFT 5.0
Option: (55) Parameter Request List
Length: 11
Parameter Request List Item: (1) Subnet Mask
Parameter Request List Item: (15) Domain Name
Parameter Request List Item: (3) Router
Parameter Request List Item: (6) Domain Name Server
Parameter Request List Item: (44) NetBIOS over TCP/IP Name Server
Parameter Request List Item: (46) NetBIOS over TCP/IP Node Type
Parameter Request List Item: (47) NetBIOS over TCP/IP Scope
Parameter Request List Item: (31) Perform Router Discover
Parameter Request List Item: (33) Static Route
Parameter Request List Item: (249) Private/Classless Static Route (Microsoft)
Parameter Request List Item: (43) Vendor-Specific Information
Option: (43) Vendor-Specific Information
Length: 2
Value: dc00
Option: (255) End
Option End: 255
Padding
No. Time Source Destination Protocol Length Info
2 0.001156 192.168.20.200 192.168.30.201 DHCP 342 DHCP Offer - Transaction ID 0x61cd03c
Frame 2: 342 bytes on wire (2736 bits), 342 bytes captured (2736 bits)
Ethernet II, Src: HewlettP_16:ce:8e (00:24:81:16:ce:8e), Dst: HewlettP_0a:f1:c0 (38:63:bb:0a:f1:c0)
Internet Protocol Version 4, Src: 192.168.20.200 (192.168.20.200), Dst: 192.168.30.201 (192.168.30.201)
User Datagram Protocol, Src Port: 67 (67), Dst Port: 67 (67)
Bootstrap Protocol (Offer)
Message type: Boot Reply (2)
Hardware type: Ethernet (0x01)
Hardware address length: 6
Hops: 0
Transaction ID: 0x061cd03c
Seconds elapsed: 0
Bootp flags: 0x0000 (Unicast)
0... .... .... .... = Broadcast flag: Unicast
.000 0000 0000 0000 = Reserved flags: 0x0000
Client IP address: 0.0.0.0 (0.0.0.0)
Your (client) IP address: 192.168.30.3 (192.168.30.3)
Next server IP address: 192.168.20.200 (192.168.20.200)
Relay agent IP address: 192.168.30.201 (192.168.30.201)
Client MAC address: DellInc_af:34:52 (00:15:c5:af:34:52)
Client hardware address padding: 00000000000000000000
Server host name not given
Boot file name not given
Magic cookie: DHCP
Option: (53) DHCP Message Type (Offer)
Length: 1
DHCP: Offer (2)
Option: (1) Subnet Mask
Length: 4
Subnet Mask: 255.255.255.0 (255.255.255.0)
Option: (58) Renewal Time Value
Length: 4
Renewal Time Value: (345600s) 4 days
Option: (59) Rebinding Time Value
Length: 4
Rebinding Time Value: (604800s) 7 days
Option: (51) IP Address Lease Time
Length: 4
IP Address Lease Time: (691200s) 8 days
Option: (54) DHCP Server Identifier
Length: 4
DHCP Server Identifier: 192.168.20.200 (192.168.20.200)
Option: (3) Router
Length: 4
Router: 192.168.30.1 (192.168.30.1)
Option: (82) Agent Information Option
Length: 12
Option 82 Suboption: (1) Agent Circuit ID
Length: 2
Agent Circuit ID: 001c
Option 82 Suboption: (2) Agent Remote ID
Length: 6
Agent Remote ID: 3863bb0af1c0
Option: (255) End
Option End: 255
Padding
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06-16-2016 01:53 PM
06-16-2016 01:53 PM
Re: Problem with DHCP beetween subnets/VLAN in HP 2530-48G
On the relay, play around with option 82 setting. You also might look for option so dhcp relay uses broadcast L3 address instead of offered IP address in DHCP-Offer packet header