Logically isolated VPNs with MPLS - Centralized DHCP

[Ronald F. Tallman]

It is a minimal config:


stash-agent-options true;

shared-network LabNet {

# LABNET Wireless Class
class "wifi-dev" {
match if option agent.circuit-id="020c020a00000a20";
lease limit 10;
                 }

subnet 10.200.17.0 netmask 255.255.255.0 {}

#Create a new pool for each class.
subnet 10.32.166.0 netmask 255.255.255.0 {
   option routers 10.32.166.1;
   option broadcast-address 10.32.166.255;
        pool {
        allow members of "wifi-dev";
        range 10.32.166.44 10.32.166.53;
             }

The only thing from the logs:

Oct 23 22:48:23 sea-securid-1 last message repeated 5 times
Oct 23 22:53:49 sea-securid-1 dhcpd: [ID 702911 local7.error] DHCPDISCOVER
from 5c:26:0a:1b:58:bb via 10.32.0.22: network LabNet: no free leas
es
Oct 23 22:55:16 sea-securid-1 last message repeated 7 times
Oct 23 23:00:37 sea-securid-1 dhcpd: [ID 702911 local7.error] DHCPDISCOVER
from 5c:26:0a:1b:58:bb via 10.32.0.22: network LabNet: no free leas
es

---------------
The 10.32.166.1 interface is in the VRF on the same router 10.32.0.22
That has the relay agent.
The 10.200.17.0 subnet is where central DHCP server lives.

-----Original Message-----
From: dhcp-users-bounces+ronthu=comcast.net at lists.isc.org
[mailto:dhcp-users-bounces+ronthu=comcast.net at lists.isc.org] On Behalf Of
Simon Hobson
Sent: Monday, October 31, 2011 9:26 AM
To: Users of ISC DHCP
Subject: Re: Logically isolated VPNs with MPLS - Centralized DHCP

Ronald F. Tallman wrote:
>Looking for a centralized DHCP solution that supports the following:
>
>.       Numerous VPNs isolated with MPLS - 
>Therefore isolated/separated subnets.
>.       Clients dispatch DHCP request
>.       Cisco router/relay agent forwards 
>request to centralized DHCP server to management 
>subnet

The ISC package will handle that - it doesn't 
really care how the packet gets to it. But bear 
in mind that you will need to have unique subnet 
addresses across the entire network served by a 
single DHCP server.

>.       Presently DHCP server recognizes 
>forwarded request but will not serve IP as it's 
>sourced from "Unknown Subnet"
>
>.       The subnet is actively provisioned in the DHCP server configuration

Then you'd best post the relevant parts of the config and logs.

-- 
Simon Hobson

Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
author Gladys Hobson. Novels - poetry - short stories - ideal as
Christmas stocking fillers. Some available as e-books.
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