Worked great! Thanks allot. -----Original Message----- From: dnsmasq-discuss-boun...@thekelleys.org.uk [mailto:dnsmasq-discuss-boun...@thekelleys.org.uk] On Behalf Of Simon Kelley Sent: Sunday, February 09, 2014 2:29 PM To: dnsmasq-disc...@thekelleys.org.uk Subject: Re: [Dnsmasq-discuss] Dnsmasq wont recieve DHCP request messaegs
On 09/02/14 07:25, Kiazada Dany-GVN438 wrote: > Hi, > > I'm using the program as a DHCP server for a Linux machine. The server > needs to toggle between two different subnets, with different GW (on > the same interface - 'br0'), and assign an IP for a windows PC. > > So for example upon power up the DHCP will assign an IP to the PC > (connected via Ethernet), with subnet 'A'. > > After a while, the DHCP will need to assign a different IP, on a > different subnet 'B'. > The way I implemented it is running dnsmasq on the Linux machine : > > -C /etc/dnsmasq.conf/sbin/dnsmasq -d --clear-on-rel > > With The following dnsmask.conf file (subnet 'A') : > > dhcp-range=27.187.20.14,27.187.20.14,255.255.255.0,3600 > > interface=br0 > > dhcp-option=3,27.187.20.1 > > dhcp-option=6,27.187.20.1 > > dhcp-leasefile=/etc/dnsmasq.leases > > dhcp-lease-max=253 > > log-dhcp > > After I receive an indication to change the subnet, I kill the dnsmasq > server, and run it again the same way only with the second subnet 'B'. > I noticed that the dnsmasq.leases is empty, and there are no connected > clients after the second power up. The PC is sending DHCPINFORM > messages (with no response) and > > In order to have the PC ask for a new IP, I cut the power to the > Ethernet Iface. This causing the PC to send DHCPREQUEST messages (with > no DISCOVER messages before). > The dnsmasq is not responding to the REQUEST messages although it's a > broadcast message, and I can see at tcpdump that they arrive to the > Linux machine... > > I can see in the app logs that the dnsmask is receiving the INFORM > messages, but I cannot see the REQUEST messages (in the app logs). > > The thing is the PC remembers the first IP it was assigned (subnet 'A'), > and although the DHCP server has a different IP range configuration, > the PC is still showing the old IP. > > So my goal is to have the PC assigned a new IP (without any PC > involvement, meaning no ipconfig renew\release commands). from a > different pool, different subnet and GW, after the dnsmasq is restarted. > Try adding dhcp-authoritative to your configuration. Cheers, Simon. _______________________________________________ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss _______________________________________________ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
