Hello,
I'm trying to troubleshoot the lab I have configured, I have some issue with broadcast between VLAN with my DHCP. I have looked around the vmware community to find my answer but I didn't that's why i'm posting here ! 
So here's my situation :
- ESX with 2 VM running :
- One Windows 2012 R2 running a DHCP with one scope configured
- This VM is assigned to the vmnic4 with port group VLAN 100
- One Windows 7 i'm using as a client
- This VM is assigned to the vmnic4 with port group VLAN 110
- One Windows 2012 R2 running a DHCP with one scope configured
- Cisco Switch with a simple configuration :
interface FastEthernet0/1
description LINK TO ESX
switchport mode trunk
switchport nonegotiate
interface FastEthernet0/24
description LINK TO ROUTER
switchport mode trunk
- Cisco "router on the stick" configuration :
interface FastEthernet0/0.100
encapsulation dot1q 100
ip address 10.1.1.254 255.255.255.0
interface FastEthernet0/0.110
encapsulation dot1q 110
ip address 10.1.2.254 255.255.255.0
ip helper address 10.1.1.0
The troubleshooting I've made :
- Setting the client IP address to static and both of the VM can ping each other
- Moving the client to the same VLAN as the DHCP server, and the DHCP server is giving an IP to the client.
- Sniffing the packet :
- I can see the DHCPDiscover from the client
- I can see from the router with the command "debug ip dhcp server packet" the packet being transmitted to the 10.1.1.0.
- I'm not able to see the packets comming from the router to the DHCP perspective
That's why i'm assuming I'm missing something from the ESX configuration.
Thanks in advance for reading this post !
PS: I linked a screenshot of the vswitch configuration
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