I have a router with some inter-vlan connections on, the router is connected to a switch, which is connected to 3 PC's on different vlans and then the switch is connected to another router which is the DHCP server. I cannot seem to get the DHCP requests working.
3 PC's (PC1: VLAN30, PC2: VLAN40, PC3: VLAN50),
R2 - DHCP Router.
interface GigabitEthernet0/1.30 encapsulation dot1Q 30 ip address 172.16.30.1 255.255.255.224 interface GigaEth0/1.40 encap dot1Q 40 ip add 172.16.40.1 255.255.255.224 int GigaEth0/1.50 encap dot1Q 50 ip add 172.16.50.1 255.255.255.224
PC 1 - switchport access vlan 30 PC 2 - switchport access vlan 40 PC 3 - switchport access vlan 50 Link back to R1 - trunk link
ip dhcp excluded-address 172.16.30.1 ip dhcp excluded-address 172.16.40.1 ip dhcp excluded-address 172.16.50.1 ip dhcp pool forVLAN30 network 172.16.30.0 255.255.255.224 default-router 172.16.30.1 ip dhcp pool forVLAN40 network 172.16.40.0 255.255.255.224 default-router 172.16.40.1 ip dhcp pool forVLAN50 network 172.16.50.0 255.255.255.224 default-router 172.16.50.1 - link back to switch - ip address 172.16.50.2 255.255.255.224
For some reason the VLAN50 PC can get the DHCP request and IP but all others fail, I have tried adding
helper-addresses to see if that helps but they end up at the DHCP router and then just give up.