[ale] dhcpd to multiple vlans from one server
Jim Kinney
jim.kinney at gmail.com
Thu Jan 22 22:17:56 EST 2015
Ouch.
Flatten the damn network and make it a huge subnet and make your life
easier.
Or better, all real DHCP is on a single /24 (or /20 or larger) and use
static dhcp for most everything else.
http://www.newegg.com/Product/Product.aspx?Item=N82E16833114084
$180 for 4 ports.
All it takes is a bit of failure to loosen the purse strings.
On Fri, 2015-01-23 at 03:04 +0000, Robert L. Harris wrote:
> Yeah, don't have hardware like that. I inherited this network and
> did not get any sty in the architecture. If I get up to Chicago I'll
> be dropping into someone's cube with a bat. They Mae no plans for dns
> our dhcp. I'm working on scrounged hardware.
>
> Right now I'm using the hp 5920 switch they put in to provide dhcp
> with vlan pools but I see that becoming unmaintainable pretty quickly
> due to static assignments.
>
> Robert
>
>
> On Thu, Jan 22, 2015, 19:58 Jim Kinney <jim.kinney at gmail.com> wrote:
> On Fri, 2015-01-23 at 02:41 +0000, Robert L. Harris wrote:
> > I have multiple projects/products, etc at work we are
> breaking into
> > separate broadcast domains ( currently 11, likely to be
> closer to 20
> > ). I don't want a different dhcp server per subnet/vlan. I
> can put a
> > trunk port to the dhcp server so if I can have dhcpd
> answering on each
> > vlan so I have centrally managed dhcp, that's ideal. So
> maybe I'm
> > stuck doing the eth0.21, etc with an IP on each subnet and
> one dhcp
> > server.
>
> I think you can do it with a single, very high port count
> machine.
> virtual nics won't do it. So a big box with x5 4 port nics
> with a line
> to each head switch or a vlan'ed port will work. Each subnet
> get's it's
> own stanza in the config file.
> >
> >
> >
> >
> >
> > On Thu Jan 22 2015 at 7:30:43 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)
> > > http://haplo.bandcamp.com/ (band
> page)
> > >
> > >
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> > --
> > Jim Kinney
> > Linux Systems Analyst
> > Physicist/Brewer
> > http://jimkinney.us
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> --
> James P. Kinney III
>
> Every time you stop a school, you will have to build a jail.
> What you
> gain at one end you lose at the other. It's like feeding a dog
> on his
> own tail. It won't fatten the dog.
> - Speech 11/23/1900 Mark Twain
>
> http://heretothereideas.blogspot.com/
>
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--
James P. Kinney III
Every time you stop a school, you will have to build a jail. What you
gain at one end you lose at the other. It's like feeding a dog on his
own tail. It won't fatten the dog.
- Speech 11/23/1900 Mark Twain
http://heretothereideas.blogspot.com/
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