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Old 12-19-2004, 05:23 PM   #1
OliXNet
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Registered: Dec 2004
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DHCP: Bad subnet number/mask combination


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.
 
Old 12-19-2004, 07:03 PM   #2
Butt-Ugly
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Location: Brisbane, Australia
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Quote:
Originally posted by OliXNet
Both ethernet adapters on olixnet have the same ip - 172.16.19.32
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).
Code:
ipcalc -n 172.16.19.0 -m 255.255.252.0
NETMASK=255.255.252.0
NETWORK=172.16.16.0
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
 
Old 12-20-2004, 11:32 AM   #3
OliXNet
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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
 
Old 01-07-2010, 11:04 AM   #4
mahdit
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Question bad subnet/number mask combination

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 ?
 
Old 01-07-2010, 11:17 AM   #5
damgar
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This thread is 4 years old, you might be better off starting a new thread in the appropriate forum.
 
  


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