<p dir="ltr"></p>
<p dir="ltr"> 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.</p>
<p dir="ltr"> 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.</p>
<p dir="ltr">Robert</p>
<br><div class="gmail_quote">On Thu, Jan 22, 2015, 19:58 Jim Kinney <<a href="mailto:jim.kinney@gmail.com">jim.kinney@gmail.com</a>> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On Fri, 2015-01-23 at 02:41 +0000, Robert L. Harris wrote:<br>
> I have multiple projects/products, etc at work we are breaking into<br>
> separate broadcast domains ( currently 11, likely to be closer to 20<br>
> ). I don't want a different dhcp server per subnet/vlan. I can put a<br>
> trunk port to the dhcp server so if I can have dhcpd answering on each<br>
> vlan so I have centrally managed dhcp, that's ideal. So maybe I'm<br>
> stuck doing the eth0.21, etc with an IP on each subnet and one dhcp<br>
> server.<br>
<br>
I think you can do it with a single, very high port count machine.<br>
virtual nics won't do it. So a big box with x5 4 port nics with a line<br>
to each head switch or a vlan'ed port will work. Each subnet get's it's<br>
own stanza in the config file.<br>
><br>
><br>
><br>
><br>
><br>
> On Thu Jan 22 2015 at 7:30:43 PM Jim Kinney <<a href="mailto:jkinney@jimkinney.us" target="_blank">jkinney@jimkinney.us</a>><br>
> wrote:<br>
> +1. All it takes is a physical connection to the subnet.<br>
><br>
> Not sure why separate vlans get assigned to separate subnets.<br>
> It doesn't provide a benefit. Vlans are for having overlapping<br>
> IP space in the same physical LAN. Which is only useful when a<br>
> LAN fills up a 10. Class A. Maybe its easier at the<br>
> switch/router management level with more than 100 subnets.<br>
> Mostly, I see it used as a job guarantee for a network admin.<br>
><br>
><br>
> On January 22, 2015 9:15:39 PM EST, Michael Trausch<br>
> <<a href="mailto:mike@trausch.us" target="_blank">mike@trausch.us</a>> wrote:<br>
> ISC dhcpd will hand an address out based on the<br>
> interface it came in on. If if eth0 has <a href="http://203.0.113.1/25" target="_blank">203.0.113.1/25</a><br>
> and eth1 has <a href="http://203.0.113.129/25" target="_blank">203.0.113.129/25</a>, and the DHCP server is<br>
> authoritative for those two subnetworks, then when it<br>
> receives a request on eth0 for an address it will<br>
> issue an address in <a href="http://203.0.113.0/25" target="_blank">203.0.113.0/25</a>; when it receives a<br>
> request on eth1 it will issue an address in<br>
> <a href="http://203.0.113.128/25" target="_blank">203.0.113.128/25</a>.<br>
><br>
> Sent from my iPad<br>
><br>
> On Jan 22, 2015, at 7:37 PM, "Robert L. Harris"<br>
> <<a href="mailto:robert.l.harris@gmail.com" target="_blank">robert.l.harris@gmail.com</a>> wrote:<br>
><br>
><br>
> > Ok, so if I have 2 subnets:<br>
> ><br>
> > 172.20.1/24 on vlan 21<br>
> > 172.20.2/24 on vlan 22<br>
> ><br>
> ><br>
> > If a host plugs into a port assigned to vlan 22, how<br>
> > do I make sure dhcpd gives out the right address?<br>
> > That's the part of the designation I'm missing.<br>
> ><br>
> ><br>
> > Robert<br>
> ><br>
> ><br>
> ><br>
> ><br>
> > On Thu Ja n 22 2015 at 5:17:25 PM James Sumners<br>
> > <<a href="mailto:james.sumners@gmail.com" target="_blank">james.sumners@gmail.com</a>> wrote:<br>
> > You just have to define the subnets in the<br>
> > config and put each subnet's pool within its<br>
> > respective block. No need for aliased IPs.<br>
> ><br>
> > On Thursday, January 22, 2015, Robert L.<br>
> > Harris <<a href="mailto:robert.l.harris@gmail.com" target="_blank">robert.l.harris@gmail.com</a>> wrote:<br>
> ><br>
> > Anyone have a dhcpd serving multiple<br>
> > subnets to multiple vlans from a<br>
> > single server on a trunk they can<br>
> > share configs? I don't want to<br>
> > spawn a bunch of servers and if I<br>
> > can do it with a single interface<br>
> > that would be ideal. If I have to<br>
> > go with eth0.0, eth0.1, etc that's a<br>
> > good second choice.<br>
> ><br>
> ><br>
> > Robert<br>
> ><br>
> ><br>
> ><br>
> ><br>
> > --<br>
> > James Sumners<br>
> > <a href="http://james.sumners.info/" target="_blank">http://james.sumners.info/</a> (technical<br>
> > profile)<br>
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> Jim Kinney<br>
> Linux Systems Analyst<br>
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James P. Kinney III<br>
<br>
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<br>
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