DHCP client moving between networks
Tim Gavin
livewire98801 at gmail.com
Thu Oct 1 04:18:46 UTC 2009
No, this was a while ago. . . I meant to post then, but I forgot to
post at that time.
I am just about to make a similar change, and was hoping to figure out
what I did wrong.
Thanks though :)
On Wed, Sep 30, 2009 at 19:48, Glenn Satchell
<Glenn.Satchell at uniq.com.au> wrote:
> 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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>>>
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