Sorry if this is a dumb question! ;-) I want to make sure this design will
work before implementing it.
The customer has been using 192.168.168.0/24 in one small flat LAN. He has
run out of these addresses and is being hit by performance issues related to
broadcasts.
He wants to implement subnets and VLANs:
VLAN 100 192.168.168.0/24
VLAN 200 192.168.169.0/24
New design:
Internet
|
s0
2600 router e1 --- public servers
e0
| dot1q trunk
switch
VLAN 200 VLAN 100
There is just one DHCP server. It will be in VLAN 100, address
192.168.168.10. The DHCP server will have 2 scopes for the 2 subnets.
We're going to do inter-VLAN routing on the 2600 router.
Will this config work as far as DHCP is concerned?
interface ethernet 0
no ip address
interface ethernet 0.1
encapsulation dot1q 100
ip address 192.168.168.1 255.255.255.0
interface ethernet 0.2
encapsulation dot1q 200
ip address 192.168.169.1 255.255.255.0
ip helper-address 192.168.168.10
Devices in VLAN 100 will broadcast and get to the DHCP server directly. The
DHCP server is in their VLAN/subnet.
Devices in VLAN 200 will broadcast. The router will hopefully pick up the
broadcast, convert it to a unicast to the DHCP server and send it back out
e0, with the GIADDR address filled in so the server will use the right scope.
Sounds like it should work, but for some unknown reason, I couldn't find an
example that showed this.
Thanks so much for your help. You could save my Christmas by helping me
verify (or poke holes) in this design! I just wanted to check on the DHCP
aspect at this point. I can fix up the NAT and routing. My brain stopped
working after the last egg nog, so help is needed! :-)
Priscilla
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