All Questions
Tagged with dhcp-server dhcpd
22
questions
1
vote
1
answer
322
views
DHCP failover with PXE
I'm trying to set up DHCP failover with PXE booting allowed from one of the DHCP servers. As required by the DHCP specification, I've setup separate pools for "regular" DHCP and for PXE ...
1
vote
2
answers
408
views
dhcpd server invalid MAC detection
On my DHCP configuration, I have on commit hook to save device information. My problem is some of the MAC addresses becomes invalid:
8:7c:39:cf:b6:3f - this should start with zero
8:d0:b7:52:f9:68 - ...
- 111
1
vote
0
answers
2k
views
What is the exact meaning of "On Commit" in ISC DHCP server configuration?
I know there are three kinds of events we can use for scripting in ISC dhcpd -- commit, expire and lease. My problem is, I am having a little problem in understanding the "commit" event. I ...
- 11
0
votes
1
answer
199
views
dhcpd unexpectedly destributes a useless route for another subnet as a default gateway
Our dhcpd.conf defines two subnets such like,
subnet 192.168.0.0 netmask 255.255.255.0 {
option routers 192.168.0.1; # internet gateway
}
subnet 192.168.1.0 netmask 255.255.255.0 {
option ...
- 25
0
votes
1
answer
73
views
DHCPd IP dispatch
For my tests, the following was done with 2 virtual machines. The server is under CentOS7 and the client under Windows 10 (MAC : 08:00:27:bd:3d:ab).
After every modification on the server side, I ...
- 395
0
votes
1
answer
752
views
Exclude subnets from distribution?
In Windows' DHCP server it is possible to exclude an entire subnet from being given out to clients which doesn't have a reservation. They call this "IP addresses excluded from distribution".
Now I ...
- 10.6k
2
votes
0
answers
678
views
Weird answer of linux DHCP server to gratitious ARP causes DHCP failure
This is a problem, that I ran into recently on a quite heavily configured linux server. This machine runs Samba as an Active Directory Domain Controller, a mail server, a web server, two virtual ...
- 438
0
votes
1
answer
2k
views
How can I configure DHCP server to issue the same fixed-address by matching with the client identifier in the discover message
I am able to config fixed ip address with hardware ethernet options, but i am trying to assign fixed ip based on client id(option 61) from DISCOVER message. I tried with below configs , but it doesn't ...
- 11
0
votes
1
answer
3k
views
Option 81 in DHCP
Just curious about this.
When we enable option 81 on a DHCP network, the DHCP server will start updating the zone that comes along with the client's FQDN.
Now, how would client will ever know its ...
- 139
0
votes
1
answer
295
views
dhcpd daemon taking huge amount of memory and restarting with out of memory error
I have to configure isc-dhcp-server for 1 million clients which listens on 4094 vlan tagged interfaces, where each vlan interface is mapped to a subnet declaration.
Therefore in total 4094 subnet ...
0
votes
0
answers
204
views
dhcp server not starting on CentOS 5 (XenServer 6.5)
I have a host with XenServer 6.5 (based on CentOS 5) that is currently set up using a static IP by following the procedure here. I have been provided with an IP address, netmask and gateway - I ...
- 101
0
votes
1
answer
542
views
DHCP leases file has 200+ instances of the same lease?
I'm not sure what's going on here. I have a CentOS 7 DHCP server, and the leases file is growing at a linear but steady rate - it's re-issuing the same lease to the same MAC over and over again, and ...
- 429
2
votes
2
answers
10k
views
dhcpd not offering reserved static IP returns unknown lease
typically when I reserve an IP for a MAC addr the device when booting up and requesting a dhcp address, will pick up the address I reserved. However recently the request looks like it comes in but ...
- 196
1
vote
1
answer
693
views
Obtaining the running config for dhcpd
Is it possible to obtain the current running config for dhcpd? I inadvertently wiped dhcpd.conf but have not yet restarted the service. It is currently assigning the correct IPs to my test ...
- 121
0
votes
2
answers
4k
views
How to block DHCP traffic using iptables
First let me describe my environment:
There is a VM (CentOS) acting as a gateway
The gateway VM has to NICs, eth0 connects to public network, eth1 connects to private network
eth0 get IP from public ...
- 274