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Re: able to get dhcp from default vlan but unable to get dhcp from clients vlan.

 
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boziah
Advisor

able to get dhcp from default vlan but unable to get dhcp from clients vlan.

I have a procurve switch 2626 j4900B,

I have default vlan which works fine and all untagged ports get dhcp from my dhcp server

however i am not able to get dhcp from  vlan 96 (named clients)

below is my config.Any help is great appreciated.

 

 ProCurve Switch 2626# show conf

Startup configuration: ; J4900B Configuration Editor; Created on release #H.10.31

hostname "ProCurve Switch 2626"

snmp-server contact "Josiah Rasugu" snmp-server location "My Crib"

time timezone -360

time daylight-time-rule Continental-US-and-Canada

mirror-port 20

console baud-rate 9600

console inactivity-timer 60

interface 2

name "domain controller"

exit

ip default-gateway 10.76.12.1

sntp server 128.101.101.101

ip routing

timesync sntp

sntp unicast

vlan 1

name "kenya"

tagged 1, 25-26

 

untagged 2-15

ip address 10.76.12.2 255.255.255.0

ip helper-address 10.76.12.15

exit

vlan 96

name "clients"

tagged 1,25-26

untagged 16-24

ip address 10.76.96.1 255.255.255.0

ip helper-address 10.76.12.15

exit

 

 

no tftp client

password manager

password operator 

16 REPLIES 16
Fredrik L├╢nnman
Honored Contributor

Re: able to get dhcp from default vlan but unable to get dhcp from clients vlan.

The config is fine, probably the problem lies elsewhere. Does the DHCP server know how to find its way back to the 10.76.96.0 network?

---
CCIE Service Provider
MASE Network Infrastructure [2011]
H3CSE
CCNP R&S

Jeff Carrell
Honored Contributor

Re: able to get dhcp from default vlan but unable to get dhcp from clients vlan.

Concur with other poster, you may need a static route in your 10.76.12.1 router to find 10.76.96.1 via 10.76.12.2

 

 

hth...Jeff

boziah
Advisor

Re: able to get dhcp from default vlan but unable to get dhcp from clients vlan.

Please explain what you mean by DHCP server know hot to find its way back to the 10.76.96.0 network?
boziah
Advisor

Re: able to get dhcp from default vlan but unable to get dhcp from clients vlan.

I am not sure how to do this can you explain further?
EckerA
Respected Contributor

Re: able to get dhcp from default vlan but unable to get dhcp from clients vlan.

Hi,

have you made a traceroute from your DHCP server to 10.76.96.1?
As your DHCP-Server has the IP 10.76.12.15 it needs to route the traffic to 10.76.96.0.
We assume it uses 10.76.12.1 as it's default gateway.
But does the router 10.76.12.1 know a route to the 10.76.96.0 subnet? If not, the server can't reach the clients in that subnet..this means the server gets the DHCP requests, and answers, but the packets are dropped at the router or somewhere else.. but the switch is configured ok.
basically the router 10.76.12.1 needs a route:
ip route 10.76.96.0 255.255.255.0 10.76.96.2

hth
alex
Fredrik L├╢nnman
Honored Contributor

Re: able to get dhcp from default vlan but unable to get dhcp from clients vlan.

ip route 10.76.96.0 255.255.255.0 10.76.12.2

 

---
CCIE Service Provider
MASE Network Infrastructure [2011]
H3CSE
CCNP R&S

boziah
Advisor

Re: able to get dhcp from default vlan but unable to get dhcp from clients vlan.

when i tried ip route 10.76.96.0 255.255.255.0 10.76.12.2.i received msg 10.76.12.2 can not be switch IP address and route gateway at the same time.I did this on the hp switch 2626
Fredrik L├╢nnman
Honored Contributor

Re: able to get dhcp from default vlan but unable to get dhcp from clients vlan.

You should type that command on the switch/router that is default gateway in vlan1, probably 10.76.12.1.

---
CCIE Service Provider
MASE Network Infrastructure [2011]
H3CSE
CCNP R&S

boziah
Advisor

Re: able to get dhcp from default vlan but unable to get dhcp from clients vlan.

my ISP router (fortinet) has the ip 10.76.12.1