Linux DHCP Server - Interface Association

I have a question about the dhcp server on linux

Basically my server has 2 interface cards

• eth0 : 192.168.2.201/255.255.255.0


• eth1 : 192.168.4.1/255.255.255.0


• eth1:0 : 10.1.1.0/24

On this server i am running the dhcpd daemon to hand out leases in the 192.168.4.0/24 subnet.

• eth0 : connected to my home router to access internet


• eth1 : connected to a cisco switch (with only default vlan) on port 1 with ip address 10.1.1.10 - this interface is used for communication with the switch for management through telnet

Now when i plug in another computer on any port on the switch i see the following

• the computer gets 169.254 self assigned ip


• i see the DHCP server did hand out a lease (/var/lib/dhcpd/dhcpd.leases file)


• under ethernet status on the client computer i see bytes sent but 0 received

Now my question is

To which interface on the linux server does the dhcpd daemon bound to ? Since i see the lease being assigned it is obviously getting the dhcp request yet the lease it sends out is not reaching the client.

Any help would be much appreciated !

thank you,
ankit

Answer

You can't use 10.1.1.0 as the IP of the NIC, that's a network ID. DHCPd should bind to all interfaces that it has subnet definitions for. So if it has only definitions for the 192.168.4/24 subnet, then it should only bind to eth1. What's the output from DHCPd when it starts? It should mention what interfaces it's listening on.