DHCP crashes due to corrupt lease file

[Sushma Reddy]

Hi Simon,

Thank you, This issue seems to be random. In past couple of months this has
happened twice. After I remove the lease from the lease file, DHCP
starts successfully and writes the same lease properly to the lease
file. Following is the lease entry for the same client in the leases file.
Everything works for some time, a month or so and dhcp crashes again with
corrupt uid.

lease 10.2.2.2 {

starts 4 2010/09/23 14:26:51;
ends 5 2010/09/24 14:26:51;
tstp 6 2010/09/25 02:26:51;
tsfp 6 2010/09/25 02:23:12;
cltt 4 2010/09/23 14:26:51;
binding state active;
next binding state expired;
hardware ethernet 18:a9:05:f3:47:11;
uid "\001\030\251\005\363G\021";
set ddns-fwd-name = "test.example.edu";
set ddns-txt = "319732a9091e353b8fcd9f01d446291e30";
set ddns-rev-name = "2.2.2.10.in-addr.arpa";
client-hostname "test";
}

lease 10.2.2.2 {

starts 4 2010/09/23 14:26:51;
ends 5 2010/09/24 14:26:51;
tstp 6 2010/09/25 02:26:51;
tsfp 6 2010/09/25 02:23:12;
cltt 4 2010/09/23 14:26:51;
binding state active;
next binding state expired;
hardware ethernet 18:a9:05:f3:47:11;
uid "\001\030\251\005\363G\021";
set ddns-fwd-name = "test.example.edu";
set ddns-txt = "319732a9091e353b8fcd9f01d446291e30";
set ddns-rev-name = "2.2.2.10.in-addr.arpa";
client-hostname "test";
}

I can take a packet capture but I am not sure if I will be able to reproduce
the issue.

Sushma

On Mon, Sep 27, 2010 at 2:52 AM, Simon Hobson <dhcp1 at thehobsons.co.uk>wrote:

> Sushma Reddy wrote:
>
> The lease file shows the following. This is the last line in the
>> dhcpd.lease file on the primary.
>>
>> lease 10.2.2.2 {
>>  starts 4 2010/09/23 14:18:29;
>>  ends 5 2010/09/24 14:18:29;
>>  tstp 6 2010/09/25 02:18:29;
>>  tsfp 6 2010/09/25 02:15:15;
>>  cltt 4 2010/09/23 14:18:29;
>>  binding state active;
>>  next binding state expired;
>>  hardware ethernet 18:a9:05:f3:47:11;
>>  uid "\
>>
>
> Can you use a traffic sniffer and capture the request packets from this
> device ? My guess is that it's put an embedded <non-printing something> at
> the front of it's ClientID (which gets stored as UID) and that's causing the
> problem.
>
> I've seen a different but related problem with a device that padded out
> it's ClientID with nulls - causing DNS updates to fails.
>
> --
> 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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