dhcpdiscover ... not responding.

[sam wun]

Hi,

I installed another copy (same version) of the isc-dhpcd service to a new freebsd 5.4 PR system. The old server was runnig 5.4 as well. While the isc-dhcpd running perfectly in the old server, but it failed to release IP in the new server. I heard that may be problem wiht freebsd tcp/ip stack, but I m not sure.

I just found out how to prints debug message from dhcpd. Just append a 
-d to the end of the dhpcd commandline.

The message shown that dhcpd clearly has problem on a network interface:

failover peer dhcp: I move from recover to startup

failover peer dhcp: I move from startup to recover

DHCPDISCOVER from 00:09:6b:8d:b2:67 via em0: not responding (recovering)

DHCPDISCOVER from 00:09:6b:8d:b2:67 via em0: not responding (recovering)

DHCPDISCOVER from 00:09:6b:8d:b2:67 via em0: not responding (recovering)

...


But I m not able to immediate identify where the  problem is. Here is 
the ifconfig message:

# ifconfig

xl0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> mtu 1500

       options=9<RXCSUM,VLAN_MTU>

       ether 00:0a:5e:51:9b:b7

       media: Ethernet autoselect (100baseTX <full-duplex>)

       status: active

em0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500

       options=b<RXCSUM,TXCSUM,VLAN_MTU>

       inet 192.168.1.200 netmask 0xffffff00 broadcast 192.168.1.255

       inet6 fe80::20e:cff:fe05:8229%em0 prefixlen 64 scopeid 0x2

       ether 00:0e:0c:05:82:29

       media: Ethernet autoselect (100baseTX <full-duplex>)

       status: active

fxp0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500

       options=8<VLAN_MTU>

       inet 192.168.4.200 netmask 0xffffff00 broadcast 192.168.4.255

       inet6 fe80::211:11ff:fe0f:9543%fxp0 prefixlen 64 scopeid 0x3

       ether 00:11:11:0f:95:43

       media: Ethernet autoselect (100baseTX <full-duplex>)

       status: active

plip0: flags=108810<POINTOPOINT,SIMPLEX,MULTICAST> mtu 1500

pflog0: flags=41<UP,RUNNING> mtu 33208

lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384

       inet 127.0.0.1 netmask 0xff000000

       inet6 ::1 prefixlen 128

       inet6 fe80::1%lo0 prefixlen 64 scopeid 0x6

pfsync0: flags=41<UP,RUNNING> mtu 1348

       pfsync: syncif: xl0 maxupd: 128

carp0: flags=41<UP,RUNNING> mtu 1500

       inet 192.168.4.1 netmask 0xffffff00

       carp: MASTER vhid 1 advbase 1 advskew 0

carp1: flags=41<UP,RUNNING> mtu 1500

       inet 192.168.1.1 netmask 0xffffff00

       carp: MASTER vhid 2 advbase 1 advskew 0



The isc-dhcpd.sh start up script start with the following option lines:

#! /bin/sh

dhcpd_enable="YES"

dhcpd_ifaces="em0"

dhcpd_chroot_enable="YES"



. /etc/rc.subr



name=dhcpd

paranoia=YES                            # compiled in paranoia?

jail=YES                
..

The dhcpd.conf.master file is written as below:

ddns-update-style none;

one-lease-per-client on;

option domain-name "myhome.com";

option domain-name-servers 192.168.4.254;

option subnet-mask 255.255.255.0;

default-lease-time 600;

max-lease-time 7200;

authoritative;



subnet 192.168.1.0 netmask 255.255.255.0 {

       option routers 192.168.1.1;

       option broadcast-address 192.168.1.255;

       pool {

               failover peer "dhcp";

               range 192.168.1.20 192.168.1.40;

               deny dynamic bootp clients;

       }

}



The Windows client is at the em0 side.



Thanks

Sam.



sam wun wrote:




>   *** From dhcp-server -- To unsubscribe, see the end of this message. 
> ***
>
> Simon Hobson wrote:
>
>  
>
>>  *** From dhcp-server -- To unsubscribe, see the end of this message. 
>> ***
>>
>> sam wun wrote:
>>
>>
>>
>>   
>>
>>> I duplicated the dhcpd.conf and dhcpd.conf.master file into another 
>>> FreeBSD system, but the same windows client failed to receive any IP 
>>> leased from the new server. There is only one thing is different 
>>> between the new server with the old server, that is the time zone. 
>>> In the new machine it is UTC, but the old one is AU. While my 
>>> windows is set to AU, does it matter for a AU windows client request 
>>> dhcpd servcie from a UTC server? The previous dhcpd server is 
>>> configured in UTC time zone.
>>>  
>>>     
>>
>> No the time zone does NOT matter.
>>
>> When you say "same windows client failed to receive any IP leased   
>> from the new server", what exactly do you mean ? If you are simply 
>
>  
>
>> going to the client and doing an ipconfig /renew, then it will 
>> attempt to contact the server which initially issued the lease to ask 
>> for a renewal. IIRC, the same will occur at startup/waking from 
>> sleep/bringing up an interface when a cable is plugged in.
>>
>>
>>
>>   
>
> I tried a manual setup of the network configuraiton in this Windows 
> machine, and verified this Windows system can logoin the new server, 
> so it is not the network problem.
>
>  
>
>> Only when it has failed to contact the old server and it's lease is 
>> almost expired (7/8th of the lease time IIRC) will it start to 
>> broadcast to find another server.
>>
>> If you do an ipconfig /release, followed by ipconfig /renew, then it 
>> should broadcast for a server.
>>
>>
>>
>>   
>
> I have done this many times.
>
>  
>
>> If this is not the case, then you'd better post whatever logs the 
>> dhcp server is producing.
>>
>>
>>
>>   
>
> How can I configure dhcpd print out debug messages?
>
> Thanks
> Sam
>
>  
>
>> Simon
>>
>>
>>
>>   
>