On Fri, Jul 25, 2008 at 4:46 PM, David Hláčik david@hlacik.eu wrote:

Hello guys,

to describe my scenario

i have 4 VLANS on my switch, each VLAN is different subject. I have one DHCP server for 3 VLANS + second one DHCP server for 1 VLAN - named VLAN 7 .

Problem is , this started to make problems suddenly. VLAN 7 is not recieving IP adress from correct DHCP server . On DHCP server where declaration for subnet is configured, i am recieving this message :

Jul 25 12:38:47 boss dhcpd: DHCPNAK on 10.123.42.169 to 00:16:cf:93:1f:33 via eth0 Jul 25 12:38:52 boss dhcpd: DHCPREQUEST for 10.123.42.169 from 00:16:cf:93:1f:33 via eth0: wrong network.

How can i solve it and what does it mean?

I am using authoritative clausule in each subnet deffinition.

Thanks in advance!

David

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CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos

If VLAN 7 has access to the VLAN that the primary dhcp server is on, you need to somehow block dhcp requests. What I did was besides using VLAN's on my switches, I have a Sonicwall firewall which handles the actual routing between vlans, then I set certain vlans to use the first dhcp server via a dhcp helper in the firewall. Then in the other vlan I point the dhcp helper at the second dhcp server.