DHCP client moving between networks

[Tim Gavin]

I knew I left something out.  The users in question moved from vlan
287 to new vlan 703.  208.xxx.223.0/24 is the only network on that
vlan.


Crap, I just realized that in my initial email I put in 216 for the
supernet address. . . sorry for the confusion :-D


On Wed, Sep 30, 2009 at 18:10, Glenn Satchell
<Glenn.Satchell at uniq.com.au> wrote:
> Hi Tim
>
> You have a shared-network around the 216.xxx.46.0 and 172.16.32.0
> subnets. This means when a request comes from that relay dhcpd is
> allowed to allocate from either pool. As the clients are requesting a
> valid address for the shared-network then it will be ACKed.
>
> If these two networks are "on the same physical network" then a
> shared-network is appropriate and you need a different way to allocate
> to the new subnet and not the old one. If they are on different vlans,
> then the shared-network is not appropriate and you should remove that
> part of the configuration.
>
> regards,
> -glenn
> --
> Glenn Satchell   mailto:glenn.satchell at uniq.com.au | Miss 9: What do you
> Uniq Advances Pty Ltd       http://www.uniq.com.au | do at work Dad?
> PO Box 70 Paddington NSW Australia 2021            | Miss 6: He just
> tel:0409-458-580     fax:02-9380-6416              | types random stuff.
>
>>Date: Wed, 30 Sep 2009 17:50:04 -0700
>>Subject: Re: DHCP client moving between networks
>>From: Tim Gavin <livewire98801 at gmail.com>
>>To: Users of ISC DHCP <dhcp-users at lists.isc.org>
>>X-BeenThere: dhcp-users at lists.isc.org
>>
>>Heh, if  you guys hadn't asked for this, I wouldn't have noticed that
>>I was still giving out hour-long leases on part of the network :)
>>
>>
>>
>>##########
>>#VLAN 287#
>>##########
>>
>>shared-network 287 {
>>        subnet 216.xxx.46.0 netmask 255.255.255.0 {
>>          range 216.xxx.46.6 216.xxx.46.254;
>>          option domain-name-servers 208.xxx.220.131, 208.xxx.220.132;
>>          option domain-name "mycompany.tld";
>>          option routers 216.xxx.46.1;
>>          option broadcast-address 216.xxx.46.255;
>>          default-lease-time 43200;     #12 hours
>>#         default-lease-time 3600;      #1 hour
>>          max-lease-time 86400;         #24 hours
>>#         max-lease-time 7200;          #2 hours
>>          authoritative;
>>        }
>>        subnet 172.16.32.0 netmask 255.255.240.0 {
>>          range 172.16.33.1 172.16.38.255;
>>          option domain-name-servers 172.16.32.21, 172.16.32.22;
>>          option domain-name "mycompany.tld";
>>          option routers 172.16.32.1;
>>          option broadcast-address 172.16.47.255;
>>          default-lease-time 43200;     #12 hours
>>#         default-lease-time 3600;      #1 hour
>>          max-lease-time 86400;         #24 hours
>>#         max-lease-time 7200;          #2 hours
>>          authoritative;
>>        }
>>authoritative;
>>}
>>
>>
>>
>>##########
>>#VLAN 288#
>>##########
>>
>>subnet 216.xxx.25.0 netmask 255.255.255.0 {
>>  range 216.xxx.25.150 216.xxx.25.250;
>>  option routers 216.xxx.25.1;
>>  option domain-name-servers 208.xxx.220.131, 208.xxx.220.132;
>>  option domain-name "mycompany.tld";
>>  option broadcast-address 216.xxx.25.255;
>>  default-lease-time 43200;
>>  max-lease-time 86400;
>>  authoritative;
>>}
>>
>>
>>
>>
>>
>>#########
>>#VLAN 703#
>>##########
>>
>>shared-network 703 {
>>        subnet 208.xxx.223.0 netmask 255.255.255.0 {
>>          range 208.xxx.223.5 208.xxx.223.240;
>>          option domain-name-servers 208.xxx.220.131, 208.xxx.220.132;
>>          option domain-name "mycompany.tld";
>>          option routers 208.xxx.223.1;
>>          option broadcast-address 208.xxx.223.255;
>>          default-lease-time 43200;
>>          max-lease-time 86400;
>>          authoritative;
>>        }
>>authoritative;
>>}
>>
>>
>>
>>
>>##########
>>#VLAN 283#
>>########
>>
>>shared-network 283 {
>>        subnet 216.xxx.27.0 netmask 255.255.255.0 {
>>          range 216.xxx.27.10 216.xxx.27.120;
>>          option domain-name-servers 208.xxx.220.131, 208.xxx.220.132;
>>          option domain-name "mycompany.tld";
>>          option routers 216.xxx.27.1;
>>          option broadcast-address 216.xxx.45.255;
>>          default-lease-time 43200;
>>          max-lease-time 86400;
>>          authoritative;
>>        }
>>
>>        subnet 208.xxx.220.192 netmask 255.255.255.224 {
>>          option domain-name-servers 208.xxx.220.131, 208.xxx.220.132;
>>          option domain-name "mycompany.tld";
>>          option routers 208.xxx.220.193;
>>          option broadcast-address 208.xxx.220.223;
>>          default-lease-time 43200;
>>          max-lease-time 86400;
>>          authoritative;
>>        }
>>authoritative;
>>}
>>
>>host marshall {
>>hardware ethernet 00:11:22:33:44:55;
>>fixed-address 208.xxx.220.207;
>>}
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>
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