I believe you can delete or move the lease files and when the dhcpd
daemon is restarted, it will auto-create the file.
If you want to be extra safe, you can make a backup copy of the leases file.
HTH
-A
On Mon, Sep 27, 2010 at 9:08 AM, Charlie Niehaus
<cnieh...@altamont.k12.il.us> wrote:
> Here is a snippit from the DHCP.LEASES file:
>
> # All times in this file are in UTC (GMT), not your local timezone. This
> is
> # not a bug, so please don't ask about it. There is no portable way to
> # store leases in the local timezone, so please don't request this as a
> # feature. If this is inconvenient or confusing to you, we sincerely
> # apologize. Seriously, though - don't ask.
> # The format of this file is documented in the dhcpd.leases(5) manual page.
> # This lease file was written by isc-dhcp-V3.0.7
>
> lease 10.0.2.205 {
> starts 1 2010/09/27 11:21:42;
> ends 1 2010/09/27 12:21:42;
> binding state active;
> next binding state free;
> hardware ethernet 00:23:47:a9:9b:00;
> }
> lease 10.0.2.136 {
> starts 1 2010/09/27 11:21:45;
> ends 1 2010/09/27 12:21:45;
> binding state active;
> next binding state free;
> hardware ethernet 00:23:47:a9:2a:e0;
>
>
> -----Original Message-----
> From: tech-geeks-boun...@tech-geeks.org
> [mailto:tech-geeks-boun...@tech-geeks.org] On Behalf Of Aaron Hackney
> Sent: Monday, September 27, 2010 7:14 AM
> To: Tech-Geeks Mailing List
> Subject: Re: [tech-geeks] IPCop - DHCP not responding.
>
> On Sun, Sep 26, 2010 at 11:59 PM, Charlie Niehaus
> <cnieh...@altamont.k12.il.us> wrote:
>> Short version - IPCOP is haning out DHCP addresses VERY VERY slowly - like
>> on every 10 minutes.
>>
>> I did not find any Rogue devices. I unplugged the 3 WAPs I added last
> week
>> and still not go.
>>
>> Watching what is going on via the web interface it IS giving out addresses
> -
>> but REAL REAL slow. I had 4 IP addresses doled out to computers that had
>> gotten an IP from DHCP before- but during that time I had a laptop that
>> tried to get an IP via DHCP and it timed out and failed. The another DHCP
>> address was given out - but not to this laptop. Seems like a file might
> be
>> corrupted - how do I rest / erase the DHCP cache of addresses?
>>
>>
>> Not sure why - but I also suspect my config file. Not sure if it changed
> or
>> if it is right. Here is what the DHCP.CONF file in /etc has:
>>
>> ddns-update-style none;
>> deny bootp; #default
>> authoritative;
>>
>> subnet 10.0.0.0 netmask 255.255.0.0 #GREEN
>> {
>> range 10.0.2.50 10.0.2.255;
>> option subnet-mask 255.255.0.0;
>> option domain-name "altamont.ipcop";
>> option routers 10.0.0.1;
>> option domain-name-servers 10.0.0.1;
>> default-lease-time 3600;
>> max-lease-time 7200;
>> } #GREEN
>>
>> host fix0 # Sperintendent Laptop - WIRED
>> {
>> hardware ethernet 00:0f:1f:cd:33:44;
>> fixed-address 10.0.0.31;
>> }
>>
>> I use 10.0.X.X IP's and I am running a class B so the subnet should be
>> 255.255.0.0
>> The range of IP's is OK: I noticed that when I ran the Rogue DHCP checker
>> program it ALWAYS picked up the HIGHEST IP in the range - even if I change
>> the range and gave it MORE Ip's to hand out.
>>
>> I ran a Wireshark while a box was trying to get an IP and the only DHCP
>> packets I saw were DHCP Discovery packets from 0.0.0.0 to 255.255.255.255
>> with a transaction IP number and that is it. It is almost like the DHCP
>> server is not responding. No DHCP Offer / DHCP Requests or DHCP Ack
> packets
>> that I could see.
>
> OK, so 1 of a few things are happening:
> 1: your DHCP discovery broadcasts are not getting to the DHCP server
> 2: your DHCP discovery broadcasts are getting to the DHCP server and
> the DHCP Offer is not getting back to the client
> 3: your DHCP discovery broadcasts are getting to the DHCP server and
> the DHCP scope is completely used up and when an address expires, an
> address is allocated
>
> Port SPAN or mirror the DHCP server's port and the client's port and
> see if 1 or 2 is occuring.
> As for 3, check the file: /var/lib/dhcpd/dhcpd.leases file.
>
> HTH
> -A
>
>>
>> But when I check the leases - it looks like the server has doled out
> another
>> one - VERY VERY SLOW!
>>
>>
>>
>> Thank in advance for any help!
>>
>>
>>
>> -----Original Message-----
>> From: tech-geeks-boun...@tech-geeks.org
>> [mailto:tech-geeks-boun...@tech-geeks.org] On Behalf Of Aaron Hackney
>> Sent: Sunday, September 26, 2010 1:39 PM
>> To: Tech-Geeks Mailing List
>> Subject: Re: [tech-geeks] IPCop - DHCP not responding.
>>
>> If you are running Cisco switches, verify that spanning-tree portfast
>> is enabled on all non-switch uplink ports.
>>
>> Run wireshark on an effected workstation. Examine the following traffic:
>>
>> DHCP discovery (From Workstation)
>> DHCP Offer (From Server)
>> DHCP Request (From Workstation)
>> DHCP Ack (From Server)
>>
>> This may give you some deeper insight as to what is going on behind the
>> scenes.
>>
>> As to what may have changed: A change in the network topology (A
>> switching loop, let's say or too many switches in line) could have
>> changed the time it takes a broadcast to propagate. Your DHCP server,
>> for what ever reason, may have exhausted it's scope (I've seen this
>> behavior with a misbehaving NIC and/or malware). Just brainstorming
>> for you....
>>
>> HTH
>> -A
>>
>>
>> On Sat, Sep 25, 2010 at 10:45 PM, Charlie Kinsella
>> <ckinse...@dixonschools.org> wrote:
>>> Did you add any new switches in the building? Aside from the wireless
> any
>>> new anything?
>>>
>>> Charles Kinsella
>>> Technology Director
>>> Dixon Public Schools
>>> ckinse...@dixonschools.org
>>> (815) 284-7725
>>>
>>>
>>> ________________________________
>>>
>>> Maybe I am not being clear. The DHCP server is not dishing out ANY
>>> addresses to ANY device that is contacting it. I tried a few IPods and a
>>> few workstations and when I set them to automatic discover / DHCP - they
>> try
>>> for a while and then fail. The PC boxes tell me I have a limited
>> connection
>>> and when I check the IP "assigned" to the box it is a 169.X.X.X address
>>> which is not really an assigned address - but what a windows box will
> plug
>>> in if the DHCP process fails.
>>>
>>> Now the weird parts
>>> - This was all working fine before late Thursday / Friday AM
>>> - From what I can tell the DHCP server IS up and running
>>> - When I use the Microsoft Rogue DHCP tool to see if there is more than
>> one
>>> DHCP server on the network it sees the one DHCP server (The IPCop box)
> AND
>>> it reports a valid IP that the DHCP server would be handing out
>>> - When I down the DHCP server and run the Rogue DHCP server tool I see NO
>>> DHCP servers on the network.
>>>
>>> So - the DHCP is there, it is running, it is handing out IP's to the
> Rogue
>>> DHCP server tool
>>> BUT
>>> No device / PC etc. is successful in communicating with the DHCP server
>> and
>>> assigning an IP that the server is providing.
>>>
>>> Any ideas would be GREATLY appreciated!
>>>
>>>
>>> | Subscription info at http://www.tech-geeks.org |
>>>
>>
>>
>>
>> --
>> "Don't ask yourself what the world needs. Ask yourself what makes you
>> come alive and then go do that. Because what the world needs is people
>> who have come alive." -Dr. Howard Thurman
>>
>> ******************************
>> Aaron Keith Hackney
>> aa...@aaronkeithstudios.com
>> Cell 210.325.2196
>> ******************************
>> | Subscription info at http://www.tech-geeks.org |
>>
>> | Subscription info at http://www.tech-geeks.org |
>>
>
>
>
> --
> "Don't ask yourself what the world needs. Ask yourself what makes you
> come alive and then go do that. Because what the world needs is people
> who have come alive." -Dr. Howard Thurman
>
> ******************************
> Aaron Keith Hackney
> aa...@aaronkeithstudios.com
> Cell 210.325.2196
> ******************************
> | Subscription info at http://www.tech-geeks.org |
>
> | Subscription info at http://www.tech-geeks.org |
>
--
"Don't ask yourself what the world needs. Ask yourself what makes you
come alive and then go do that. Because what the world needs is people
who have come alive." -Dr. Howard Thurman
******************************
Aaron Keith Hackney
aa...@aaronkeithstudios.com
Cell 210.325.2196
******************************
| Subscription info at http://www.tech-geeks.org |
