wrong ip address from vlan

Hi all,

we have 2 dhcp server.

DCHP 1 (10.80.60.10)
Vlan 7
10.80.60.x

DHCP 2 (10.92.60.45)
Vlan 331
10.224.60.x

Cisco Core switch configuration.

interface Vlan7
 description Staff&Fac_VLAN
 ip address 10.80.60.1 255.255.252.0
 ip access-group FAC_7_STU in
 ip helper-address 10.80.60.10

interface Vlan331
 ip address 10.224.60.1 255.255.252.0
 ip helper-address 10.92.60.45

edge switch contains only Vlan 331 but the users taking ip from Vlan7.

any idea whats going worng.
shahzebasifAsked:
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wshtyCommented:
did you disable the default vlan(1)?

also did you have a check on the cabling?
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shahzebasifAuthor Commented:
yes default vlan 1 is disabled

interface Vlan1
 no ip address
 shutdown

cabling is fine cross checked.
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kzin_xxxxCommented:
You don't need/want an Ip helper on vlan 7 for starters. Any device on that subnet can already see the servers.

The IP helper is to let devices know where to go when not on the same subnet.

Try that first.
0
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shahzebasifAuthor Commented:
tried that....but still taking ip 10.80.60.x
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AkinsdNetwork AdministratorCommented:
Do you have a dhcp scope for the correct subnet.

Somehow, arp messages sent to dhcp2 is going to dhcp1

Check the VLAN configuration on the ports the computers are plugged into. Make sure it is set to VLAN 331.

Check the scopes on the dhcp servers.
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kzin_xxxxCommented:
Sorry - just missed the obvious. your DHCP2 (10.92.60.45) server is not a valid address for either of those ranges. So unless that's a typo , where ever it sits it will be unable to respond to anything on another subnet.

I think we need to know more about the delivered DHCP scope on the servers and any core routing too.

You could try adding a new scope to the DHCP1 server for that range (10.224.60.1 255.255.252.0) and delivering it from there - at least as a short term test. And change the ip helper to match

interface Vlan331
 ip helper-address 10.80.60.10
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shahzebasifAuthor Commented:
it was a switch porblem. wrong vlan was configured on it.
0
shahzebasifAuthor Commented:
I've requested that this question be closed as follows:

Accepted answer: 0 points for shahzebasif's comment #a39627162

for the following reason:

thanks for the help
0
AkinsdNetwork AdministratorCommented:
It means you didn't pay attention to my post above.

Do you have a dhcp scope for the correct subnet. 

Somehow, arp messages sent to dhcp2 is going to dhcp1

Check the VLAN configuration on the ports the computers are plugged into. Make sure it is set to VLAN 331. 

Open in new window

0

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shahzebasifAuthor Commented:
I've requested that this question be closed as follows:

Accepted answer: 200 points for Akinsd's comment #a39627421
Assisted answer: 0 points for shahzebasif's comment #a39627162

for the following reason:

thats the solution
0
AkinsdNetwork AdministratorCommented:
Check the VLAN configuration on the ports the computers are plugged into. Make sure it is set to VLAN 331.
ID: 39467112


it was a switch porblem. wrong vlan was configured on it.
ID: 39627162
0
shahzebasifAuthor Commented:
thanks
0
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