Hello. I´m new to linux and I would like to configure my network. I have two PCs (server ¨olixnet¨ running Mandrake 10.1 - connected to intenet via ethernet card eth0 and to a laptop ¨kvakos¨ running Windows XP via eth1). This is a topology:

ISP<---------->eth0-olixnet-eth1<--------->kvakos

Both ethernet adapters on olixnet have the same ip - 172.16.19.32. Everything works fine but the DHCP. When I try to start DHCP, it writes ¨bad subnet number/mask combination. subnet 172.16.19.0 netmask 255.255.252.0¨
This is my dhcpd.conf file:

ddns-update-style none;
subnet 172.16.19.0 netmask 255.255.252.0 {
# default gateway
option routers 172.16.19.32;
option subnet-mask 255.255.252.0;
range dynamic-bootp 172.16.19.79 172.16.19.80;
default-lease-time 21600;
max-lease-time 43200;
}
When I change netmask to 255.255.255.0 it works but I need to leave it 255.255.252.0. It worked on Mandrake 9. Please tell me how to make it work properly. Thanx.

You need to assign different IP addresses to each network device, they can not be the same.

Also, you haven't specified a range of IPs to lease for your workstations (only bootp).Also your 172.16.19.0 is not a valid network address for that subnet., that's why /24 worked ok.

Here's a howto if you need it: http://www.brennan.id.au/10-DHCP_Server.html

Miles

thank you very much... but... I´ve configured eth1 to IP 172.16.19.79, then DHCP subnet IP to 172.16.16.0 and successfully started DHCP server. I´ve tried ipconfig /renew on WinXP and it works properly... The only problem is that I can´t ping the linux machine. ping 172.16.19.79 even 172.16.19.32 doesn´t work... I know it is probably stupid problem, but remember I am very new to Linux.. So, please be patient

Hi,I use following commands in dhcpd.conf and get the subnet number/mask combination err.please help me

subnet 20.20.20.0 netmask 255.0.0.0 {
range 20.20.20.20 20.20.20.30;
};

what is my problem ?

This thread is 4 years old, you might be better off starting a new thread in the appropriate forum.