Hello, I am running a DHCP-Server that serves multiple subnets. The server has an IP address in all of these subnets, and its primary IP address in a subnet that is not served by DHCP. Every IP address has its own VLAN Ethernet interface, eth0.102, eth0.104, etc. In this setup, the DHCP server often does not send its unicast replies on the interface where it received the corresponding request, but on the interface of its primary IP address, and with that IP. My first thought how to change this was by setting routes depending on destination addresses, but this would cause big problems with other services running on the same machine, so I tried to combine iproute2 and iptables, like this: iptables -t mangle -A OUTPUT -p udp --source-port bootps \ -d xxx.xxx.22.0/24 -j MARK --set-mark 122 ip route add to xxx.xxx.22.0/24 dev eth0.122 table 122 ip rule add fwmark 122 table 122 Though I can see in my logs that iptables really sets that mark, routing does not work as expected and the server still uses its primary IP address for sending unicast DHCP replies. What am I doing wrong and what must be done to achieve the desired behaviour? Regards Christoph -- To unsubscribe from this list: send the line "unsubscribe linux-admin" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
