Vlan and dhcp issues

[mdrabble]

I have a switch with a number of computers which have suddenly refused to pick up dhcp addresses on all VLANs apart from vlan 1.

 

If I plug a fluke tester or a laptop I get the correct vlan IP address.

 

I have swapped out my Unifi edgemax switch with a netgear and the same issues exists.

 

Anyone any clues why a group of machines will suddenly refuse to pick up dhcp?

 

Cheers

[Davit2005]

Is vlan 1 where your DHCP server sits?

 

I have seen switches give the same issue but you have been there. Have you tried different uplink ports or different SFP's.

[mdrabble]

No, DHCP servers are in the Desktop VLAN, - left old DHCP range in VLAN whilst i finished off port changes etc.

 

I've moved an affect PC to a different part of the network to see if that resolved anything by still not picking up DHCP address on the Desktop VLAN

[mdrabble]

Having reset the switch - printers and phones are getting the correct vlan details - seems i have about 10 desktops which the NIC have all suddenly gone faulty as they refuse to pick up DHCP from any source!

 

Any ideas?

[mdrabble]

Looks like the NICs on those PCs have some kind of spike - USB NIC works absolutely fine.

[mdrabble]

I put a new NIC into one of the affect desktop and hey presto it works perfectly - plug only NIC back in and refused to pick on correct VLAN IP

 

I think a core switch reboot may be in order just incase something weird happing on there.