[ale] dhcpd to multiple vlans from one server

[Jim Kinney]

+1. All it takes is a physical connection to the subnet.

Not sure why separate vlans get assigned to separate subnets. It doesn't provide a benefit. Vlans are for having overlapping IP space in the same physical LAN. Which is only useful when a LAN fills up a 10. Class A. Maybe its easier at the switch/router management level with more than 100 subnets. Mostly, I see it used as a job guarantee for a network admin.

On January 22, 2015 9:15:39 PM EST, Michael Trausch <mike at trausch.us> wrote:
>ISC dhcpd will hand an address out based on the interface it came in
>on. If if eth0 has 203.0.113.1/25 and eth1 has 203.0.113.129/25, and
>the DHCP server is authoritative for those two subnetworks, then when
>it receives a request on eth0 for an address it will issue an address
>in 203.0.113.0/25; when it receives a request on eth1 it will issue an
>address in 203.0.113.128/25. 
>
>Sent from my iPad
>
>> On Jan 22, 2015, at 7:37 PM, "Robert L. Harris"
><robert.l.harris at gmail.com> wrote:
>> 
>> Ok, so if I have 2 subnets:
>> 
>> 172.20.1/24 on vlan 21
>> 172.20.2/24 on vlan 22
>> 
>> If a host plugs into a port assigned to vlan 22, how do I make sure
>dhcpd gives out the right address?  That's the part of the designation
>I'm missing.
>> 
>> Robert
>> 
>> 
>>> On Thu Jan 22 2015 at 5:17:25 PM James Sumners
><james.sumners at gmail.com> wrote:
>>> You just have to define the subnets in the config and put each
>subnet's pool within its respective block. No need for aliased IPs. 
>>> 
>>>> On Thursday, January 22, 2015, Robert L. Harris
><robert.l.harris at gmail.com> wrote:
>>>> 
>>>> Anyone have a dhcpd serving multiple subnets to multiple vlans from
>a single server on a trunk they can share configs?  I don't want to
>spawn a bunch of servers and if I can do it with a single interface
>that would be ideal.  If I have to go with eth0.0, eth0.1, etc that's a
>good second choice.  
>>>> 
>>>> Robert
>>> 
>>> 
>>> -- 
>>> James Sumners
>>> http://james.sumners.info/ (technical profile)
>>> http://jrfom.com/ (personal site)
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>>> 
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--
Jim Kinney
Linux Systems Analyst
Physicist/Brewer
http://jimkinney.us
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