Hello All I have looking for any specific answer for one thing. I have a virtualized Server with only one physical interface eth0 (WAN). To run OpenVPN i need to use DHCP server. And here is the question: is there a chance to run DHCP server on eth0:0 interface? Or it is impossible ? Thanks in advance. -- /Best Regards *Greg*/ UML Professional (Cert #251574932)
On 02/03/2013 06:38 AM, Grzegorz So?tys wrote:> Hello All > > I have looking for any specific answer for one thing. > > I have a virtualized Server with only one physical interface eth0 (WAN). > To run OpenVPN i need to use DHCP server. And here is the question: is > there a chance to run DHCP server on eth0:0 interface? Or it is impossible ? > > Thanks in advance. >From the EL6 Deployemtn Guide: https://access.redhat.com/knowledge/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Deployment_Guide/sect-Configuring_a_Multihomed_DHCP_Server.html "If a system has three network interfaces cards -- eth0, eth1, and eth2 -- and it is only desired that the DHCP daemon listens on eth0, then only specify eth0 in /etc/sysconfig/dhcpd" DHCPDARGS="eth0" So in your case, edit the file /etc/sysconfig/dhcpd and set: DHCPDARGS="eth0:0"; -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 262 bytes Desc: OpenPGP digital signature URL: <http://lists.centos.org/pipermail/centos/attachments/20130203/4482b60e/attachment-0003.sig>
I have made it, and the DHCP server won't start telling me: " Feb 3 13:42:21 vlan19 dhcpd: No subnet declaration for eth0:0 (no IPv4 addresse s). Feb 3 13:42:21 vlan19 dhcpd: ** Ignoring requests on eth0:0. If this is not what Feb 3 13:42:21 vlan19 dhcpd: you want, please write a subnet declaration Feb 3 13:42:21 vlan19 dhcpd: in your dhcpd.conf file for the network segment Feb 3 13:42:21 vlan19 dhcpd: to which interface eth0:0 is attached. ** " I have conifgured all files to use DHCPD on this interface. Do you need all conifguraiton? /Best Regards *Grzegorz So?tys*/ __________________ UML Professional (Cert #251574932) W dniu 2013-02-03 14:28, Johnny Hughes pisze:> On 02/03/2013 06:38 AM, Grzegorz So?tys wrote: >> Hello All >> >> I have looking for any specific answer for one thing. >> >> I have a virtualized Server with only one physical interface eth0 (WAN). >> To run OpenVPN i need to use DHCP server. And here is the question: is >> there a chance to run DHCP server on eth0:0 interface? Or it is impossible ? >> >> Thanks in advance. >> > From the EL6 Deployemtn Guide: > https://access.redhat.com/knowledge/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Deployment_Guide/sect-Configuring_a_Multihomed_DHCP_Server.html > > > "If a system has three network interfaces cards -- eth0, eth1, and eth2 > -- and it is only desired that the DHCP daemon listens on eth0, then > only specify eth0 in /etc/sysconfig/dhcpd" > DHCPDARGS="eth0" > > So in your case, edit the file /etc/sysconfig/dhcpd and set: > > DHCPDARGS="eth0:0"; > > > > > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos
Eliezer Croitoru
2013-Feb-04 12:55 UTC
[CentOS] CentOs 6 DHCP Server and virtual interface
On 2/3/2013 2:38 PM, Grzegorz So?tys wrote:> > Hello All > > I have looking for any specific answer for one thing. > > I have a virtualized Server with only one physical interface eth0 (WAN). > To run OpenVPN i need to use DHCP server. And here is the question: is > there a chance to run DHCP server on eth0:0 interface? Or it is impossible ?And why is that? run dhcp server on any of the addresses block dhcp traffic on the eht0 interface and use a tun\tap interface for openVPN...> > Thanks in advance. >-- Eliezer Croitoru http://www1.ngtech.co.il
On 02/03/2013 04:38 AM, Grzegorz So?tys wrote:> I have a virtualized Server with only one physical interface eth0 (WAN). > To run OpenVPN i need to use DHCP server.I don't think you do. OpenVPN can allocate addresses without ISC DHCP, typically.> And here is the question: is > there a chance to run DHCP server on eth0:0 interface? Or it is impossible ?Probably not. An alias is not an interface. You can configure the alias, and tell DHCP to only serve the subnet that matches, but requests come in to the main interface via broadcast. No matter what you do, DHCPd is really serving eth0, not eth0:0.