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.
On 02/03/2013 06:38 AM, Grzegorz Sołtys 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/ht...
"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";
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 Sołtys*/ __________________ UML Professional (Cert #251574932)
W dniu 2013-02-03 14:28, Johnny Hughes pisze:
On 02/03/2013 06:38 AM, Grzegorz Sołtys 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/ht...
"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@centos.org http://lists.centos.org/mailman/listinfo/centos
On 02/03/2013 07:38 AM, Grzegorz Sołtys wrote:
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?
Inside your dhcpd.conf file you need a subnet declaration and the IP Address of ETH0:0 has to be in that subnet.
See:
https://access.redhat.com/knowledge/docs/en-US/Red_Hat_Enterprise_Linux/6/ht...
So, for example, if I have:
subnet 192.168.0.16 mask 255.255.255.240 { option <whatever> option <whatever2> }
Then eth0:0 would have to be inside the IP Range of the subnet ... in this case, 192.168.0.16/255.255.255.240 is the IP addresses from 192.168.0.16 through 192.168.0.31 (with 16 and 31 being not usable as they are the network name and the broadcast address). This would mean that eth0:0's IP address would need to be somewhere in the range of 192.168.0.17 and 192.168.0.30 to serve that subnet.
W dniu 2013-02-03 14:28, Johnny Hughes pisze:
On 02/03/2013 06:38 AM, Grzegorz Sołtys 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/ht...
"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@centos.org http://lists.centos.org/mailman/listinfo/centos
So, if my WAN IP adress is 83.238.*.* then i need to run DHCP server in the same class of if address. But, if got only this address and i will setup in eg: 83.238.55.10 to 15 range for eth0:0 and there is a machine with WAN address like 83.238.55.13 if gonna to make IP address colission? or then it will be avalible only as LAN Address for my server?
/Best Regards *Grzegorz Sołtys*/ __________________ UML Professional (Cert #251574932)
W dniu 2013-02-03 14:50, Johnny Hughes pisze:
On 02/03/2013 07:38 AM, Grzegorz Sołtys wrote:
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?
Inside your dhcpd.conf file you need a subnet declaration and the IP Address of ETH0:0 has to be in that subnet.
See:
https://access.redhat.com/knowledge/docs/en-US/Red_Hat_Enterprise_Linux/6/ht...
So, for example, if I have:
subnet 192.168.0.16 mask 255.255.255.240 { option <whatever> option <whatever2> }
Then eth0:0 would have to be inside the IP Range of the subnet ... in this case, 192.168.0.16/255.255.255.240 is the IP addresses from 192.168.0.16 through 192.168.0.31 (with 16 and 31 being not usable as they are the network name and the broadcast address). This would mean that eth0:0's IP address would need to be somewhere in the range of 192.168.0.17 and 192.168.0.30 to serve that subnet.
W dniu 2013-02-03 14:28, Johnny Hughes pisze:
On 02/03/2013 06:38 AM, Grzegorz Sołtys 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/ht...
"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@centos.org http://lists.centos.org/mailman/listinfo/centos
CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
On 02/03/2013 08:11 AM, Grzegorz Sołtys wrote:
So, if my WAN IP adress is 83.238.*.* then i need to run DHCP server in the same class of if address. But, if got only this address and i will setup in eg: 83.238.55.10 to 15 range for eth0:0 and there is a machine with WAN address like 83.238.55.13 if gonna to make IP address colission? or then it will be avalible only as LAN Address for my server?
Yes, if you are going to serve dhcp to a subnet, the server has to have an address on that subnet. It will indeed need to take one of the addresses of that subnet, and you can not have one of your other machines get that address.
You can use the dhcp machine to do other things on that same address though ... so it can do dhcp AND replace one of the other machines.
W dniu 2013-02-03 14:50, Johnny Hughes pisze:
On 02/03/2013 07:38 AM, Grzegorz Sołtys wrote:
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?
Inside your dhcpd.conf file you need a subnet declaration and the IP Address of ETH0:0 has to be in that subnet.
See:
https://access.redhat.com/knowledge/docs/en-US/Red_Hat_Enterprise_Linux/6/ht...
So, for example, if I have:
subnet 192.168.0.16 mask 255.255.255.240 { option <whatever> option <whatever2> }
Then eth0:0 would have to be inside the IP Range of the subnet ... in this case, 192.168.0.16/255.255.255.240 is the IP addresses from 192.168.0.16 through 192.168.0.31 (with 16 and 31 being not usable as they are the network name and the broadcast address). This would mean that eth0:0's IP address would need to be somewhere in the range of 192.168.0.17 and 192.168.0.30 to serve that subnet.
W dniu 2013-02-03 14:28, Johnny Hughes pisze:
On 02/03/2013 06:38 AM, Grzegorz Sołtys 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/ht...
"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@centos.org http://lists.centos.org/mailman/listinfo/centos
CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
On Mon, Feb 4, 2013 at 5:42 AM, Johnny Hughes johnny@centos.org wrote:
On 02/03/2013 08:11 AM, Grzegorz Sołtys wrote:
So, if my WAN IP adress is 83.238.*.* then i need to run DHCP server in the same class of if address. But, if got only this address and i will setup in eg: 83.238.55.10 to 15 range for eth0:0 and there is a machine with WAN address like 83.238.55.13 if gonna to make IP address colission? or then it will be avalible only as LAN Address for my server?
Yes, if you are going to serve dhcp to a subnet, the server has to have an address on that subnet. It will indeed need to take one of the addresses of that subnet, and you can not have one of your other machines get that address.
You can use the dhcp machine to do other things on that same address though ... so it can do dhcp AND replace one of the other machines.
Or slightly more convoluted, you could run dhcrelay on a machine that has interfaces on both the subnet serving dhcp and the one where you want it to be forwarded. Not sure it would help in this scenario but it works where the dhcp server is on some other machine. You still need the subnet declaration in the dhcp server for the forwarded subnet.
On 2/3/2013 2:38 PM, Grzegorz Sołtys 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.
On 02/03/2013 04:38 AM, Grzegorz Sołtys 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.
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