Fedora Users — Re: I am confused about DHCP

2008/6/16 Tim <ignored_mailbox@xxxxxxxxxxxx>:

John Cornelius:

>> The problem arises because you seem to have an impractically long lease
>> time. Note that the lease issued on 2008/06/11 doesn't expire until
>> 2008/06/18 so your lease time seems to be 7 days. Most DHCP servers only
>> issue leases for 24 hours and those are renewed by the client after
>> (typically) 12 hours.

I don't see any particular problem with long leases. I use them, it's
useful on networks where machines only connect sporadically, but you'd
still like them to use the same address as last time.

A lease isn't a guarantee. A client will usually get the same IP, if
possible, but the server can re-use an IP if something else needs it and
doesn't have any previously unallocated ones spare. A client can also,
still, get assigned the same IP after a lease has expired.

Antonio M:

> What is different between a Fedora computer and a Windows computer???

See if the DHCP server still stores lease data in /var [1], like it used
to back on Fedora Core 4. If so, you'll see that the Windows clients
*also* give the server a UID.

1. /var/lib/dhcp/dhcpd.leases

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I see the uid only for Windows computers (don't be fooled by ethernet 00:16:d4:dc:a7:08, this is a dual-boot machine, actually it can start with Vista, F9, F10!!!)

# The format of this file is documented in the dhcpd.leases(5) manual page.
# This lease file was written by isc-dhcp-4.0.0

lease 192.168.0.233 {
starts 5 2008/02/22 12:14:13;
ends 5 2008/02/29 12:14:13;
tstp 5 2008/02/29 12:14:13;
binding state free;
hardware ethernet 00:16:d4:dc:a7:08;
}
lease 192.168.0.222 {
starts 5 2008/03/14 14:10:04;
ends 5 2008/03/21 14:10:04;
tstp 5 2008/03/21 14:10:04;
binding state free;
hardware ethernet 00:16:d4:dc:a7:08;
}
lease 192.168.0.250 {
starts 4 2008/04/03 08:41:31;
ends 4 2008/04/10 08:00:13;
tstp 4 2008/04/10 08:00:13;
binding state free;
hardware ethernet 00:16:d4:dc:a7:08;
}
lease 192.168.0.229 {
starts 5 2008/04/18 07:44:33;
ends 5 2008/04/25 07:00:47;
tstp 5 2008/04/25 07:00:47;
binding state free;
hardware ethernet 00:16:d4:dc:a7:08;
}
lease 192.168.0.232 {
starts 5 2008/04/18 07:17:10;
ends 5 2008/04/25 07:17:10;
tstp 5 2008/04/25 07:17:10;
binding state free;
hardware ethernet 00:16:d4:dc:a7:08;
}
lease 192.168.0.249 {
starts 1 2008/04/21 08:23:48;
ends 1 2008/04/28 08:23:48;
tstp 1 2008/04/28 08:23:48;
binding state free;
hardware ethernet 00:16:d4:dc:a7:08;
}
lease 192.168.0.227 {
starts 5 2008/05/09 07:59:24;
ends 5 2008/05/16 07:59:24;
tstp 5 2008/05/16 07:59:24;
binding state free;
hardware ethernet 00:16:d4:dc:a7:08;
}
lease 192.168.0.208 {
starts 2 2008/05/20 11:45:47;
ends 2 2008/05/27 11:45:47;
tstp 2 2008/05/27 11:45:47;
cltt 2 2008/05/20 11:45:47;
binding state free;
hardware ethernet 00:16:d4:dc:a7:08;
}
lease 192.168.0.129 {
starts 4 2008/05/22 07:42:16;
ends 4 2008/05/29 07:42:16;
tstp 4 2008/05/29 07:42:16;
cltt 4 2008/05/22 07:42:16;
binding state free;
hardware ethernet 00:16:d4:dc:a7:08;
}
lease 192.168.0.248 {
starts 4 2008/05/22 16:07:40;
ends 4 2008/05/29 16:07:40;
tstp 4 2008/05/29 16:07:40;
cltt 4 2008/05/22 16:07:40;
binding state free;
hardware ethernet 00:1b:38:33:59:60;
uid "\001\000\03383Y`";
}
lease 192.168.0.244 {
starts 2 2008/06/03 09:52:59;
ends 2 2008/06/03 09:54:59;
tstp 2 2008/06/03 09:54:59;
cltt 2 2008/06/03 09:52:59;
binding state free;
hardware ethernet 00:1a:80:23:e3:7b;
uid "\001\000\032\200#\343{";
client-hostname "PC-contecsrl";
}
lease 192.168.0.246 {
starts 2 2008/06/03 07:35:10;
ends 2 2008/06/10 07:35:10;
tstp 2 2008/06/10 07:35:10;
cltt 2 2008/06/03 07:35:10;
binding state free;
hardware ethernet 00:16:d4:dc:a7:08;
uid "\001\000\026\324\334\247\010";
}
lease 192.168.0.60 {
starts 3 2008/06/04 09:46:09;
ends 3 2008/06/11 09:46:09;
tstp 3 2008/06/11 09:46:09;
cltt 3 2008/06/04 09:46:09;
binding state free;
hardware ethernet 00:16:d4:dc:a7:08;
}
lease 192.168.0.89 {
starts 3 2008/06/04 11:19:06;
ends 3 2008/06/11 11:19:06;
tstp 3 2008/06/11 11:19:06;
cltt 3 2008/06/04 11:19:06;
binding state free;
hardware ethernet 00:16:d4:dc:a7:08;
}
lease 192.168.0.80 {
starts 3 2008/06/04 11:23:23;
ends 3 2008/06/11 11:23:23;
tstp 3 2008/06/11 11:23:23;
cltt 3 2008/06/04 11:23:23;
binding state free;
hardware ethernet 00:16:d4:dc:a7:08;
}
lease 192.168.0.62 {
starts 3 2008/06/11 07:07:52;
ends 3 2008/06/18 07:07:52;
tstp 3 2008/06/18 07:07:52;
cltt 3 2008/06/11 07:07:52;
binding state active;
next binding state free;
hardware ethernet 00:16:d4:dc:a7:08;
client-hostname "acer";
}
lease 192.168.0.224 {
starts 4 2008/06/12 06:39:18;
ends 4 2008/06/19 06:39:18;
tstp 4 2008/06/19 06:39:18;
cltt 4 2008/06/12 06:39:18;
binding state active;
next binding state free;
hardware ethernet 00:16:d4:dc:a7:08;
}
lease 192.168.0.241 {
starts 5 2008/06/13 07:22:33;
ends 5 2008/06/20 07:22:33;
tstp 5 2008/06/20 07:22:33;
cltt 5 2008/06/13 07:22:33;
binding state active;
next binding state free;
hardware ethernet 00:16:d4:dc:a7:08;
}
lease 192.168.0.90 {
starts 5 2008/06/13 07:47:01;
ends 5 2008/06/20 07:47:01;
tstp 5 2008/06/20 07:47:01;
cltt 5 2008/06/13 07:47:01;
binding state active;
next binding state free;
hardware ethernet 00:16:d4:dc:a7:08;
}
lease 192.168.0.79 {
starts 1 2008/06/16 07:05:45;
ends 1 2008/06/23 07:05:45;
tstp 1 2008/06/23 07:05:45;
cltt 1 2008/06/16 07:05:45;
binding state active;
next binding state free;
hardware ethernet 00:16:d4:dc:a7:08;
client-hostname "acer";
}
lease 192.168.0.155 {
starts 1 2008/06/16 08:00:05;
ends 1 2008/06/23 08:00:05;
tstp 1 2008/06/23 08:00:05;
cltt 1 2008/06/16 08:00:05;
binding state active;
next binding state free;
hardware ethernet 00:1a:80:23:e3:7b;
uid "\001\000\032\200#\343{";
client-hostname "PC-contecsrl";
}
lease 192.168.0.158 {
starts 1 2008/06/16 13:05:25;
ends 1 2008/06/23 13:05:25;
tstp 1 2008/06/23 13:05:25;
cltt 1 2008/06/16 13:05:25;
binding state active;
next binding state free;
hardware ethernet 00:16:d4:dc:a7:08;
client-hostname "acer";
}
lease 192.168.0.158 {
starts 1 2008/06/16 13:27:25;
ends 2 2008/06/17 13:27:25;
cltt 1 2008/06/16 13:27:25;
binding state active;
next binding state free;
hardware ethernet 00:16:d4:dc:a7:08;
client-hostname "acer";
}
lease 192.168.0.158 {
starts 1 2008/06/16 13:27:29;
ends 2 2008/06/17 13:27:29;
cltt 1 2008/06/16 13:27:29;
binding state active;
next binding state free;
hardware ethernet 00:16:d4:dc:a7:08;
client-hostname "acer";
}

--
Antonio Montagnani
Skype : antoniomontag

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