Issue / bug with DHCP INFORM requests
Guillaume
sirocco at gmx.fr
Sun Dec 11 00:03:54 UTC 2011
Hi,
I setup a dhcp server with release 4.2.3-P1 and I got problems with DHCP
INFORM requests.
it seems that DHCP INFORM does not take care of host configuration.
I made a specific configuration where a host does not have the same
parameters as the subnet :
ddns-domainname "home.dns";
ddns-update-style none;
ddns-updates off;
option domain-name "home.dns";
default-lease-time 21600;
max-lease-time 43200;
subnet 10.0.0.0 netmask 255.255.255.0 {
authoritative;
allow unknown-clients;
option subnet-mask 255.255.255.0;
option broadcast-address 10.0.0.255;
option routers 10.0.0.1;
option domain-name-servers 10.0.0.1;
option ntp-servers 10.0.0.1;
option time-offset 1;
range 10.0.0.240 10.0.0.254;
}
host mypc {
hardware ethernet 1c:11:11:11:11:11;
fixed-address 10.0.0.208;
option subnet-mask 255.255.255.0;
option broadcast-address 10.0.0.255;
option routers 10.0.0.2;
option domain-name-servers 10.0.0.2;
option ntp-servers 10.0.0.2;
option time-offset 1;
}
- - -
Here is the issue :
When I boot "mypc" it sends "DHCP Request" to the snmp server and it
gets the good ip address (10.0.0.208) and good gateway, dns and ntp
server (10.0.0.2)
After some time "mypc" sends "DHCP Inform" but the dhcp server provides
wrong gateway, dns and ntp server (10.0.0.1)
Then, if I manually force a "DHCP Request" mypc gets good ip address
(10.0.0.208) and good gateway, dns and ntp server (10.0.0.2)
but as soon as mypc sends "DHCP Inform" it gets wrong gateway, dns and
ntp server (10.0.0.1) from the DHCP server
Do you have any idea why this happen ?
Thanks,
Guillaume
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