DHCP client moving between networks
Glenn Satchell
Glenn.Satchell at uniq.com.au
Thu Oct 1 03:48:59 UTC 2009
Hmm, can you find some entries from syslog showing the old addresses
being ACKed? That might give a clue, as otherwise the subnet definition
looks ok.
Be careful with the spelling of authoritative (yours looks ok), if you
get it wrong the parser thinks you just defined a new variable, so
doesn't mark it as an error...
regards,
-glenn
>Date: Wed, 30 Sep 2009 19:12:37 -0800
>Subject: Re: DHCP client moving between networks
>From: Tim Gavin <livewire98801 at gmail.com>
>To: Glenn Satchell <Glenn.Satchell at uniq.com.au>, Users of ISC DHCP
<dhcp-users at lists.isc.org>
>X-BeenThere: dhcp-users at lists.isc.org
>X-MIME-Autoconverted: from quoted-printable to 8bit by mail.uniq.com.au id
n913DigA011751
>
>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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>>>dhcp-users at lists.isc.org
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>>
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