Hi, Im getting this messages in the /var/log/messages about my dhcp server. I assume there is nothing to worry about, but just in case I have to ask. Are these messages fine? Do I need to specify the interface on which the dhcp server should listen to?
... dhcpd: Multiple interfaces match the same subnet: eth0 eth1 dhcpd: Multiple interfaces match the same shared network: eth0 eth1 LPF/eth1/00:a0:d1:e2:f5:1f/192.168.3/24
dhcpd: Multiple interfaces match the same subnet: eth0 eth1 dhcpd: Sending on LPF/eth1/00:a0:d1:e2:f5:1f/192.168.3/24 dhcpd: Multiple interfaces match the same shared network: eth0 eth1 dhcpd: Listening on LPF/eth0/00:a0:d1:e2:f5:1e/192.168.3/24 ....
Thanks Jean
On Thu, 22 Feb 2007, Jean Figarella wrote:
Hi, Im getting this messages in the /var/log/messages about my dhcp server. I assume there is nothing to worry about, but just in case I have to ask. Are these messages fine? Do I need to specify the interface on which the dhcp server should listen to?
dhcpd: Multiple interfaces match the same subnet: eth0 eth1 dhcpd: Multiple interfaces match the same shared network: eth0 eth1 LPF/eth1/00:a0:d1:e2:f5:1f/192.168.3/24
You have two interfaces configured to listen on the same subnet -- the problem is in your /etc/sysconfig/network-scripts/ifcfg-eth0 and ifcfg-eth0 overlapping -- fix that, restart the network, and restart the dhcp server, and the messages will disappear
- Russ Herrold
At 09:42 AM 2/22/2007, Jean Figarella wrote:
Hi, Im getting this messages in the /var/log/messages about my dhcp server. I assume there is nothing to worry about, but just in case I have to ask. Are these messages fine? Do I need to specify the interface on which the dhcp server should listen to?
... dhcpd: Multiple interfaces match the same subnet: eth0 eth1 dhcpd: Multiple interfaces match the same shared network: eth0 eth1 LPF/eth1/00:a0:d1:e2:f5:1f/192.168.3/24
dhcpd: Multiple interfaces match the same subnet: eth0 eth1 dhcpd: Sending on LPF/eth1/00:a0:d1:e2:f5:1f/192.168.3/24 dhcpd: Multiple interfaces match the same shared network: eth0 eth1 dhcpd: Listening on LPF/eth0/00:a0:d1:e2:f5:1e/192.168.3/24 ....
What's ifconfig report for the IP addresses and subnet masks of your multiple interfaces? And are these interfaces in fact cabled to the same switch/hub?
Thanks Jean _______________________________________________ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Daniel Senie wrote:
At 09:42 AM 2/22/2007, Jean Figarella wrote:
Hi, Im getting this messages in the /var/log/messages about my dhcp server. I assume there is nothing to worry about, but just in case I have to ask. Are these messages fine? Do I need to specify the interface on which the dhcp server should listen to?
... dhcpd: Multiple interfaces match the same subnet: eth0 eth1 dhcpd: Multiple interfaces match the same shared network: eth0 eth1 LPF/eth1/00:a0:d1:e2:f5:1f/192.168.3/24
dhcpd: Multiple interfaces match the same subnet: eth0 eth1 dhcpd: Sending on LPF/eth1/00:a0:d1:e2:f5:1f/192.168.3/24 dhcpd: Multiple interfaces match the same shared network: eth0 eth1 dhcpd: Listening on LPF/eth0/00:a0:d1:e2:f5:1e/192.168.3/24 ....
What's ifconfig report for the IP addresses and subnet masks of your multiple interfaces? And are these interfaces in fact cabled to the same switch/hub?
Thanks Jean _______________________________________________ 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
Yes, the two interfaces are configured to be int he same network using the same switch and everything; only because this server is replacing an old server. I guess if this is not an "OK" design I can just move the dhcp to a new server, since that this would be so easy to do.
Jean
On 22/02/07, Jean Figarella jfigarella@vecna.com wrote:
Yes, the two interfaces are configured to be int he same network using the same switch and everything; only because this server is replacing an old server. I guess if this is not an "OK" design I can just move the dhcp to a new server, since that this would be so easy to do.
You should not have two NIC's in same subnet connected to the same switch. I guess the previous set-up was meant for redundancy, but it should have been NIC-bonding with a single IP, not the way you describe.
Yes, the two interfaces are configured to be int he same network using the same switch and everything; only because this server is replacing an old server. I guess if this is not an "OK" design I can just move the dhcp to a new server, since that this would be so easy to do.
Or you could define a specific interface for dhcp to listen on. It doesn't really need to listen on both if they're on the same network. This can be done in /etc/sysconfig/dhcpd
At 10:26 AM 2/22/2007, you wrote:
Daniel Senie wrote:
At 09:42 AM 2/22/2007, Jean Figarella wrote:
Hi, Im getting this messages in the /var/log/messages about my dhcp server. I assume there is nothing to worry about, but just in case I have to ask. Are these messages fine? Do I need to specify the interface on which the dhcp server should listen to?
... dhcpd: Multiple interfaces match the same subnet: eth0 eth1 dhcpd: Multiple interfaces match the same shared network: eth0 eth1 LPF/eth1/00:a0:d1:e2:f5:1f/192.168.3/24
dhcpd: Multiple interfaces match the same subnet: eth0 eth1 dhcpd: Sending on LPF/eth1/00:a0:d1:e2:f5:1f/192.168.3/24 dhcpd: Multiple interfaces match the same shared network: eth0 eth1 dhcpd: Listening on LPF/eth0/00:a0:d1:e2:f5:1e/192.168.3/24 ....
What's ifconfig report for the IP addresses and subnet masks of your multiple interfaces? And are these interfaces in fact cabled to the same switch/hub?
Thanks Jean _______________________________________________ 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
Yes, the two interfaces are configured to be int he same network using the same switch and everything; only because this server is replacing an old server. I guess if this is not an "OK" design I can just move the dhcp to a new server, since that this would be so easy to do.
You might want to use aliaing, so that eth0 is the base address and eth0:0 is the IP address of the old server you've pulled out of service. That way your new server will respond to both addresses, but without the issues that arise with two interfaces on the same subnet. The DHCP server will operate without complaint in the presence of additional IP addresses on a single interface.
Daniel Senie wrote:
At 10:26 AM 2/22/2007, you wrote:
Daniel Senie wrote:
At 09:42 AM 2/22/2007, Jean Figarella wrote:
Hi, Im getting this messages in the /var/log/messages about my dhcp server. I assume there is nothing to worry about, but just in case I have to ask. Are these messages fine? Do I need to specify the interface on which the dhcp server should listen to?
... dhcpd: Multiple interfaces match the same subnet: eth0 eth1 dhcpd: Multiple interfaces match the same shared network: eth0 eth1 LPF/eth1/00:a0:d1:e2:f5:1f/192.168.3/24
dhcpd: Multiple interfaces match the same subnet: eth0 eth1 dhcpd: Sending on LPF/eth1/00:a0:d1:e2:f5:1f/192.168.3/24 dhcpd: Multiple interfaces match the same shared network: eth0 eth1 dhcpd: Listening on LPF/eth0/00:a0:d1:e2:f5:1e/192.168.3/24 ....
What's ifconfig report for the IP addresses and subnet masks of your multiple interfaces? And are these interfaces in fact cabled to the same switch/hub?
Thanks Jean _______________________________________________ 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
Yes, the two interfaces are configured to be int he same network using the same switch and everything; only because this server is replacing an old server. I guess if this is not an "OK" design I can just move the dhcp to a new server, since that this would be so easy to do.
You might want to use aliaing, so that eth0 is the base address and eth0:0 is the IP address of the old server you've pulled out of service. That way your new server will respond to both addresses, but without the issues that arise with two interfaces on the same subnet. The DHCP server will operate without complaint in the presence of additional IP addresses on a single interface. _______________________________________________ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Problem solved. Using ip aliases.
Thanks
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Alvin Chang -
Daniel Senie -
Jean Figarella -
Jim Perrin -
R P Herrold