Intresting issue - WDS / Multicasting /PXE and Vlans

[craigg]

We've been using MDT/WSUS/Lite Touch here for a while now & everything is working great. Although yesterday i noticed something strange and wondered if anyone had seen anything similar.

 

So...

 

• Our WDS server sits in our Default VLAN (192.168.0.0/22)
  
• One set of clients that I imaged lived in vlan 8 (10.0.8.0/24)
  

 

These clients connected fine & you could see them in the multicast Share in WDS. However I went to PXE boot some clients in a different vlan, This time Vlan 9 (10.0.9.0/24), and they were picking up Vlan 8 DHCP addresses on PXE boot and obviously hanging.

 

As a precaution I tested pxe boot on a dev machine in the default VLAN and it went straight through.

 

 

How strange is that!? Our routing seems to be Okay as all of our clients/servers, no matter what vlan they are on, talk to each other and we haven't had any issues to date.

 

Mental times, Mental times!