Re: [Dnsmasq-discuss] DHCP, how to ignore the client MAC address?
Hi John, thanks for your reply. On 12.01.19 07:48, john doe wrote: If the maintaner of dnsmasq has not chimed in that leav us with to options: - To much on his plate, something could be done to answer this question. - The issue lies elsewhere (predicting way for MAC addressing). Ok, than we wait, maybe Simon jump's in... Many Thanks Michael ___ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
Re: [Dnsmasq-discuss] DHCP, how to ignore the client MAC address?
Hi John, On 11.01.19 10:53, john doe wrote: On 1/11/2019 9:49 AM, MIchael Schleicher (smicha) wrote: Hi, thanks for your reply. On 10.01.19 22:25, wkitt...@gmail.com wrote: On 1/10/19 3:26 PM, Michael Schleicher wrote: As I said, for Linux VM's, I can set a uniq Client-ID that helps, but on Windows you can not set define a Client-ID (as far as I know). isn't this the machine name? when i was supporting winwhatever, the install generated a machine name... that is the name i saw used in DHCP requests... it is the name that was added to the DNS so queries on it would return its current IP... I have just checked on my environment what's in the dnsmasq.leases file: 1547246444 00:50:56:85:23:ea 10.198.10.223 win-vm 01:00:50:56:85:23:ea 1547276503 00:50:56:85:f1:86 10.198.10.37 linux-vm 01:00:50:56:85:f1:86 As you see the Client-ID (5th field) is the MAC + "01:" as prefix. You previously said that the hostname is always the same, as ilustrated by the above they are not (win-vm vs linux-vm)? That are 2 different systems. (1 Windows and 1 Linux VM). It's just a example Thanks Michael ___ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
Re: [Dnsmasq-discuss] DHCP, how to ignore the client MAC address?
Hi, thanks for your reply. On 10.01.19 22:25, wkitt...@gmail.com wrote: On 1/10/19 3:26 PM, Michael Schleicher wrote: As I said, for Linux VM's, I can set a uniq Client-ID that helps, but on Windows you can not set define a Client-ID (as far as I know). isn't this the machine name? when i was supporting winwhatever, the install generated a machine name... that is the name i saw used in DHCP requests... it is the name that was added to the DNS so queries on it would return its current IP... I have just checked on my environment what's in the dnsmasq.leases file: 1547246444 00:50:56:85:23:ea 10.198.10.223 win-vm 01:00:50:56:85:23:ea 1547276503 00:50:56:85:f1:86 10.198.10.37 linux-vm 01:00:50:56:85:f1:86 As you see the Client-ID (5th field) is the MAC + "01:" as prefix. Many Thanks Michael ___ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
Re: [Dnsmasq-discuss] DHCP, how to ignore the client MAC address?
Hi John, thanks for your reply. I did some tests with your hints. On 7.1.2019 17:41, john doe wrote: Some hints from dnsmasq.conf: # Give the machine which says its name is "bert" IP address # 192.168.0.70 and an infinite lease #dhcp-host=bert,192.168.0.70,infinite Do not work with my setup, because when we re-deploy a VM, the MAC address will be autom. changed. The re-delpoyed VM will than get a different IP as the old vm had before. # Always give the host with client identifier 01:02:02:04 # the IP address 192.168.0.60 #dhcp-host=id:01:02:02:04,192.168.0.60 # Always give the host with client identifier "marjorie" # the IP address 192.168.0.60 #dhcp-host=id:marjorie,192.168.0.60 OK, the setting of the DHCP Client ID on the linux clients to example the "hostname" will fix the problem. But, as far as I see, I can not change or set the DHCP Client-ID on Windows systems :-( Or, when we need to run a vm appliance, where I do not have access to the OS, this option will also not work. Do you have an other idea how I can fix the problem? # Enable the address given for "judge" in /etc/hosts # to be given to a machine presenting the name "judge" when # it asks for a DHCP lease. #dhcp-host=judge See also (1) for more info on 'dhcp-host'. 1) http://www.thekelleys.org.uk/dnsmasq/docs/dnsmasq-man.html Maybe is it possible to "patch" the code of dnsmasq, where dnsmasq can ignore the MAC address in the DHCP task? Many Thanks Michael ___ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
[Dnsmasq-discuss] DHCP, how to ignore the client MAC address?
Hi all, first of all, thank you for the grade software !!! But I have a small questions regarding "dnsmasq" and DHCP requests. Background: We have running different, isolated test-landscapes. In each network a VM is running with dnsmasq, which do the DHCP/DNS task. Some of the VM's in the landscape needs to have a "static" DHCP-IP, because a Firewall in front of the landscape routes traffic to the VM's (Rules are IP based) So far so good. Sometimes, when VM's (with the static DHCP-IP) has some problems and crash's and can not "release" there DHCP-IP, we need to re-deploy the same VM from our pool. But, when the re-deployement process is starting, that new VM will have a different MAC Address per default. The Hostname is the same as before the old one had. Now, the problem is begin, because dnsmasq have already a valid DHCP lease for the old (destroyed) VM and the new, re-deployed VM will get a different IP as expect. I see in the dnsmasq logfile the following message: not using configured address 10.117.247.79 because it is leased to 00:50:56:85:02:ff The traffic from the firewall in front of, can reach the new VM (because the new VM does not have the correct expected IP). In the past I use the tool "dhcp_release" to fix the issue, but now I ask is there an other way to fix this problem. Question: I there an option, that dnsmasq ignore the Client MAC address for "static" DHCP leases? As far as I see, dnsmasq use a combination of "Hostname" and "MAC" for the DHCP leases. I hope I could describe my problem understandable ;-) Many Thanks Michael ___ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
