Am Mittwoch, den 25.05.2005, 23:46 +0200 schrieb Ragnar Wisloff:
> I'm observing a puzzling problem. It seems that the DHCP request sent
> out by the thin client is subtly different the first and second time
> (two DHCP requests are sent during a single boot). The second DHCP
> request contains more information, and the DHCPD server sees this as a
> different request. Even if the MAC address is the same, they have
> different uids and so a different IP is handed out. These two stanzas
> from a leases file shows this behaviour:
>
> lease 192.168.199.153 {
> starts 3 2005/05/25 09:56:32;
> ends 4 2005/05/26 09:56:32;
> tstp 4 2005/05/26 09:56:32;
> binding state active;
> next binding state free;
> hardware ethernet 00:50:8b:50:c1:85;
> }
> lease 192.168.199.245 {
> starts 3 2005/05/25 09:56:43;
> ends 4 2005/05/26 09:56:43;
> tstp 4 2005/05/26 09:56:43;
> binding state active;
> next binding state free;
> hardware ethernet 00:50:8b:50:c1:85;
> uid "\001\000P\213P\301\205";
The obvious difference is the existence of a "uid" in the second (LTSP
initrd's) dhcp request. I never noticed that phenomenon before...
Perhaps someone knows where those uids come from. However you should be
free to arrange an IP-saving setup at least as workaround, with a
dhcpd.conf "switch" that picks all requests without uid to have a real
short lifetime. 120 seconds should be enough by far. Alternatively, you
could have a look into the initrd scripts for the reasons for that "uid"
request. Someone probably had good reasons to use that!?
I'm not sure about your setups, but using 172.16.0.0/16 ...
172.31.0.0/16 networks guarantesse lots of IPs to be available. I prefer
using those for any network that might eventually grow over 100 hosts.
Besides, 10.0.0.0/8 gives even more adress space.
Regards,
Anselm
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