Default Gateways and DHCP

Question

Hello all,   I am just looking for some pointers before I venture into this next part of our network setup.   What we have is 1 6224 and 4 3448's....   I have created multiple VLANS (routed) first off how do I get those VLANS to use DHCP from our existing DHCP server without adding a DHCP server to each VLAN? Is this what DHCP relay is for and if so is it possible to use that per VLAN only?   Next we have just added a second Internet connection and would like to use 2 gateways, some VLANS would use one Gateway and others would use another. What is the best way to accomplish this? My new Gateway is 10.10.0.1 should I connect this to a port on the 6224 and place that port in the VLANS that I want to use that as the gateway? Also I have it set up like that right now, but the issue becomes that if I change the gateway address on the clients in VLAN 10 to 10.10.0.1 then they are unable to ping other computers in other VLANS because I have to take out the gateway of 10.10.0.2 (VLAN 10 ip address) to accomplish this, does that make any sense... What would be the best way to accomplish this? This may be a little vague so let me know if you need further info on this...   Thanks for any help...

DRNO10 · Answer

The DCHP relay option should work fine for you. Just add in the address of the DHCP server into the relay field and make sure there is a vlan with an interface that can reach that server. In the case of server2003 just setup multiple scopes(one for each vlan) with the appropriate gateway ect for each one. When the request gets forwarded from the switch to the DHCP box if will check to see if there is a scope that the requesting machines would fall into(based on the gateway it came through). Should work pretty slick.     now 2 internet gateways gets a little more complicated. I will post some ideas when i get a chance.

drebbin · Answer

Thanks for the reply, I'll let you know if it works out for me...

Crzywolf · Answer

The 6224 will not support multiple gateways since you can only configure one static route that sends all packets to one IP.  The ip route command is destination based and not source based.

Networking General

Default Gateways and DHCP

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