[ale] dhcpd to multiple vlans from one server

[Michael Trausch]

It can be useful for other partitioning. Using different subjects only simplifies the (human) thinking processes. It'd theoretically be possible to have e.g., home and work clans, where the work vlan is an authenticated LAN in the VLAN, I think.

Sent from my iPad

> On Jan 22, 2015, at 9:26 PM, Jim Kinney <jkinney at jimkinney.us> wrote:
> 
> +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 Ja n 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
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