[SOLVED] DHCP Server, Proxmox and OVH

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Phobos D'thorga

Member
May 3, 2018
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Hello!

I have been pulling my hair out in an attempt to set this up, so any assistance to get this going would be greatly appreciated, thank you. I am on the OVH network (i.e. SoYouStart) and have been trying to follow this guide here: docs.modulesgarden.com/Proxmox_Cloud_For_WHMCS#Automatic_IP_Address_Assignment

I have come this far:

Code: 
# option definitions common to all supported networks...
option domain-name "<main-host-name>";
option domain-name-servers <nameserver-1>, <nameserver-2>;
default-lease-time 600;
max-lease-time 7200;
option subnet-mask 255.255.255.0;
option broadcast-address <broadcast-address>;
option routers <gateway-address>;
subnet xxx.xxx.xxx.56 netmask 255.255.255.248 {
#ProxmoxIPv4
        host 1 {hardware ethernet xx:xx:xx:xx:57:d8;fixed-address xxx.xxx.xxx.56; }
        host 2 {hardware ethernet xx:xx:xx:xx:09:09;fixed-address xxx.xxx.xxx.57; }
        host 3 {hardware ethernet xx:xx:xx:xx:40:88;fixed-address xxx.xxx.xxx.58; }
        host 4 {hardware ethernet xx:xx:xx:xx:88:d9;fixed-address xxx.xxx.xxx.59; }
        host 5 {hardware ethernet xx:xx:xx:xx:87:26;fixed-address xxx.xxx.xxx.60; }
        host 6 {hardware ethernet xx:xx:xx:xx:3f:89;fixed-address xxx.xxx.xxx.61; }
        host 7 {hardware ethernet xx:xx:xx:xx:65:01;fixed-address xxx.xxx.xxx.62; }
        host 8 {hardware ethernet xx:xx:xx:xx:7f:70;fixed-address xxx.xxx.xxx.63; }
}

It's coming up with the error:

Code: 
May 03 07:19:39 tauryk dhcpd[19967]: No subnet declaration for vmbr0 (xxx.xxx.xxx.xxx).
May 03 07:19:39 tauryk dhcpd[19967]: ** Ignoring requests on vmbr0.  If this is not what
May 03 07:19:39 tauryk dhcpd[19967]:    you want, please write a subnet declaration
May 03 07:19:39 tauryk dhcpd[19967]:    in your dhcpd.conf file for the network segment
May 03 07:19:39 tauryk dhcpd[19967]:    to which interface vmbr0 is attached. **
May 03 07:19:39 tauryk dhcpd[19967]:
May 03 07:19:39 tauryk dhcpd[19967]:
May 03 07:19:39 tauryk dhcpd[19967]: No subnet declaration for vmbr1 (no IPv4 addresses).
May 03 07:19:39 tauryk dhcpd[19967]: ** Ignoring requests on vmbr1.  If this is not what
May 03 07:19:39 tauryk dhcpd[19967]:    you want, please write a subnet declaration
May 03 07:19:39 tauryk dhcpd[19967]:    in your dhcpd.conf file for the network segment
May 03 07:19:39 tauryk dhcpd[19967]:    to which interface vmbr1 is attached. **
May 03 07:19:39 tauryk dhcpd[19967]:
May 03 07:19:39 tauryk dhcpd[19967]:
May 03 07:19:39 tauryk dhcpd[19967]: No subnet declaration for eth0 (no IPv4 addresses).
May 03 07:19:39 tauryk dhcpd[19967]: ** Ignoring requests on eth0.  If this is not what
May 03 07:19:39 tauryk dhcpd[19967]:    you want, please write a subnet declaration
May 03 07:19:39 tauryk dhcpd[19967]:    in your dhcpd.conf file for the network segment
May 03 07:19:39 tauryk dhcpd[19967]:    to which interface eth0 is attached. **

I have Virtual MAC Addresses for each IP but what am I doing wrong? Any help would be sincerely appreciated, thanks.
 
I have gotten the DHCP server working in the end, thank you :) In the last of places where you look, right before you give up, you come across this article!

lowendtalk.com/discussion/125165/assign-static-ips-to-kvm-vps-in-proxmox-using-dhcp
 
Hey! For anyone taking a look at this topic in the future the posted guide alone is NOT enough to fully set up a DHCP server It will only assign an IP address, it will not assign a default gateway. Because of this you should receive an error similar to this when installing debian on a KVM machine: "The network autoconfiguration was SUCCESSFUL. However, no DEFAULT ROUTE was set". To make sure your KVM machines are assigned a default route or default gateway your /etc/dhcp/dhcpd.conf needs to look similar to this:

option rfc3442-classless-static-routes code 121 = array of integer 8;
subnet 0.0.0.0 netmask 0.0.0.0 {
default-lease-time 21600000;
max-lease-time 432000000;
option rfc3442-classless-static-routes 32,e,f,g,h,0,0,0,0,0,e,f,g,h;

host VM1 { hardware ethernet xx:xx:xx:xx:xx:xx; fixed-address a.b.c.d; option domain-name-servers 8.8.8.8,8.8.4.4; }
}

xx:xx:xx:xx:xx:xx=the mac address associated with the IP address you want to assign
a.b.c.d=the IP address to be assigned
e,f,g,h=the default gateway IP address e.g. if your default gatway IP is 192.168.10.23 then e=192,f=168,g=10,h=23 (and yes those are commas, not periods)

I have tested this configuration with OVH's infrastructure like the title suggests but anyone trying to do anything similar with another hosting company should follow this example.
 
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