On Fri, 2008-06-13 at 10:16 +0200, Antonio M wrote: > I have a small LAN with DHCP running on Fedora 9. I checked the active > leases: this is the list of active leases > 1)I don't understand how IP address is connected to MAC address, i.e. > if a MAC has already an IP address, should a new lease be started with > same MAC address?? I see 5 IP's connected to same MAC address If you have configured your DHCP server to always give the same IP address to a particular MAC, then that is what it should do. However, that wasn't a default condition the last time that I set up a DHCP server. And there's two aspects to that: Whether the server always give the same MAC the same IP, regardless (if the server is dynamically giving out addresses, there's various rules that are used to determine whether to give the same address). And whether *you've* configured certain MACs to be associated with particular IPs. Various factors are involved in getting a lease, and on dual-boot systems, the different information sent from the DHCP client to the DCHP server meant that some got different leases. As well as the MAC, there's other information provided by the client, and if some parts of that data are different, that's enough reason for giving out a different IP. You can override that. You can hard configure MACs to get particular IPs. Even if you don't program in specific IPs for specific MACs, you can reconfigure so that the same MAC should always get the same IP (it'll be a random dynamic assignment the first time, then the same one subsequently). Giving leases a long default expiry time will help, too. > 2) How are the IP adressess released?? I would expect 192.168.0.63 > after 192.168.0.62 and so on... (please note that 00:16:d4:dc:a7:08 > sometimes is started by F9 and sometimes by F10 It depends on the server. My server's still on Fedora Core 4. I specified a range of IPs to be allocated dynamically, and it starts handing out the highest numbers first. Other servers start from the lowest IP, and work upwards. It also depends on the client (in combination with the server). The client can request specific addresses (they usually ask for the same one that they had last time), and the server can give it to them (but doesn't have to). > 200 IP addresses available, 6 allocated (3 %) > > IP Address Ethernet Hostname Start Date End Date > 192.168.0.62 00:16:d4:dc:a7:08 acer 2008/06/11 07:07:52 2008/06/18 07:07:52 > 192.168.0.224 00:16:d4:dc:a7:08 2008/06/12 06:39:18 2008/06/19 06:39:18 > 192.168.0.155 00:1a:80:23:e3:7b PC-contecsrl 2008/06/12 07:03:23 2008/06/19 07:03:23 > 192.168.0.158 00:16:d4:dc:a7:08 2008/06/13 07:47:01 2008/06/20 06:50:47 > 192.168.0.241 00:16:d4:dc:a7:08 2008/06/13 07:22:33 2008/06/20 07:22:33 > 192.168.0.90 00:16:d4:dc:a7:08 2008/06/13 07:47:01 2008/06/20 07:47:01 > 192.168.0.155 00:1a:80:23:e3:7b PC-contecsrl 2008/06/13 07:50:57 2008/06/20 07:50:57 I notice some don't have hostnames on the table. Are the entries with the same MACs multi-boot computers? (Having more than one OS.) Do they also connect to other DHCP servers? -- [tim@localhost ~]$ uname -r 2.6.25.4-30.fc9.i686 Don't send private replies to my address, the mailbox is ignored. I read messages from the public lists. -- fedora-list mailing list fedora-list@xxxxxxxxxx To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-list
