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Thread: DHCP Across Multiple Hops




DHCP Across Multiple Hops
user name
2008-07-21 15:25:17
Hello,

I am setting up a network with an dhcp server several hops
away as follows:

Workstation-Vlan1 --> fa0/1-Layer3_switchB-fa0/24 -->
fa0/0-routerB-s0/0 -->
s0/0-routerA-gi1/1 --> gi1/1-Layer3_switchA-Vlan2 -->
gi1/24-Layer2_switchA-gi1/1 --> dhcp_server-10.22.2.2

I would like Workstation-Vlan1 to get an dhcp address from
dhcp_server-10.22.2.2.  Please verify the following
configuration:

Layer3_switchB#> ip forward-protocol udp bootps
Layer3_switchB#> interface Vlan1
Layer3_switchB#>  ip helper-address 10.22.2.2

routerB#> ip forward-protocol udp bootps

routerA#> ip forward-protocol udp bootps

Layer3_switchA> ip forward-protocol udp bootps

inter-vlan routing is enabled on Layer3_switchA. 
Workstations on
Layer2_switchA (in trunk mode with Layer3_switchA) in
different Vlans
currently receive their dhcp addresses from 10.22.2.2

Do I need to restate the ip helper-address on the
intermediate hops as
follows:

routerB#> interface s0/0
routerB#>  ip helper-address 10.22.2.2

routerA#> interface gi1/1
routerA#>  ip helper-address 10.22.2.2

Do I also need the following for the return unicast:

routerB#> interface fa0/0
routerB#>  ip helper-address 10.22.2.2

routerA#> interface s0/0
routerA#>  ip helper-address 10.22.2.2

Hopefully that`s self explanatory and not too hard to
follow.  Let me know
if you need clarification.

Any other suggestions are welcome.

Thank you,

--Jeff


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