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HP 2920 not getting dhcp from the server

marka01
Occasional Advisor

HP 2920 not getting dhcp from the server

hi,

 Basically I'm getting DHCP for vlan 1 main network (10.10.1.0) but cannot get DHCP for Wireless VLAN 103 (10.10.3.0). tested port 5 which is untagged . Config below :

 ; J9729A Configuration Editor; Created on release #WB.15.12.0015
; Ver #05:18.41.ff.35.0d:9b

ip default-gateway 10.10.1.253

ip route 0.0.0.0 0.0.0.0 10.10.1.253

 vlan 1
   name "Default"
   no untagged 5,13-14,41-42
   untagged 1-4,6-12,15-40,43-44,A1-A2,B1-B2,Trk1
   ip address 10.10.1.250 255.255.255.0
   ip helper-address 10.10.1.10
   exit

 vlan 103
   name "WIFI"
   untagged 5,41-42
   ip address 10.10.3.254 255.255.255.0
   ip helper-address 10.10.1.10
   exit

 

Any suggestions on what am I missing ? Routing ?  I can ping 10.10.1.10 ( DHCP server, Windows 2012 R2 Standard) and 10.10.3.254 (VLAN 103 gw) from the switch

4 REPLIES
MichaelRicardo
Frequent Advisor

Re: HP 2920 not getting dhcp from the server

think you need enable IP routing

 DHCP-relay requires IP Routing to be enabled on the HP Procurve Series Switch. the ip routing global configuration command is used. 

 ip routing

 

 

marka01
Occasional Advisor

Re: HP 2920 not getting dhcp from the server

hi,

you mean just to enable IP routing command in Config mode ? I have tried that but does not seem to change anything after disabling and re-enabling port.. still does not aquire IP.

marka01
Occasional Advisor

Re: HP 2920 not getting dhcp from the server

What I have figured out thought with Wireshark that only DHCP Discover request is been sent from the network card. But nothing after that.. it means traffic is lost somewhere. I tried to set a static route from VLANs to the DHCP server  :

ip route 10.10.3.254 255.255.255.255 10.10.1.10 (DHCP)
ip route 10.10.4.254 255.255.255.255 10.10.1.10

but then I cannot even ping vlan IP from the switch..

Switch# ping 10.10.3.254
Request timed out.

Once removed..PING goes through again

16again
Respected Contributor

Re: HP 2920 not getting dhcp from the server

On VLAN1 , you don't need dhcp helper
IP address 10.10.3.254 should be pingable from DHCP server

With wireshark, sniff the DHCP server port to check if Discover is receivec and Offer is sent