itguy411
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How can I get DHCP ( layer 2 ) packets to forward between vlans on a network switch ?
We have 2 vlans and need to have the DHCP server on one vlan ( 500 ) and the dhcp clients on a different vlan ( 200 ). Is there a way to forward the packets across the vlans ? We want the vlan with the dhcp server to be isolated from the systems requesting the services except for DNCP and DNS.
Thank you all again.
D
Thank you all again.
D
on a cisco switch there is a command you can type to forward DHCP requests to a DHCP server on a different VLAN. the command is this.
ip helper-address 10.10.10.10
as that1guy said, this has to be done on the layer 3 device. This particular command is entered in the VLAN config mode.
ip helper-address 10.10.10.10
as that1guy said, this has to be done on the layer 3 device. This particular command is entered in the VLAN config mode.
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If its a Microsoft DHCP setup, you could always just use the DHCP Relay service running on a Microsoft box to forward the packets, but this only works if the Vlans can route to each other.
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Mike:
Good suggestion and it is good to know, however in this case the microsoft server is in the other vlan thus would never see the packet to forward it.
Good suggestion and it is good to know, however in this case the microsoft server is in the other vlan thus would never see the packet to forward it.
the helper command forwards all UDP broadcasts to the indicated address. you need to configure this on your router that connects the two vlans.
After setting that up you can create access list to filter the traffic you want