How to define default gateway with multiple DHCP interfaces?

Solution 1:

When you are setting up the subnet, use the routers option in dhcpd.conf

option routers 239.252.197.1;

From http://linux.die.net/man/8/dhcpd

subnet 239.252.197.0 netmask 255.255.255.0 {
  range 239.252.197.10 239.252.197.250;
  default-lease-time 600 max-lease-time 7200;
  option subnet-mask 255.255.255.0;
  option broadcast-address 239.252.197.255;
  option routers 239.252.197.1;
  option domain-name-servers 239.252.197.2, 239.252.197.3;
  option domain-name "isc.org";
}

If you don't have access to the DHCP server, you might be able to do this in the /etc/network/interfaces file. This is similar to how it would be set up statically, only using DHCP and specifying the gateway.

iface eth0 inet dhcp
    gateway 10.21.8.1

How to define default gateway with multiple DHCP interfaces?

Solution 1:

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