Mailing List Archive: Client machine cannot acquire the IP from dhcp server

Client machine cannot acquire the IP from dhcp server

Jun 14, 2007, 10:22 PM

Post #1 of 4 (2545 views)

Hi, syslinux:

I use pxelinux to install Linux from network. Currently, my problem is:

The first time, the client machine can acquire the IP address from
dhcp server but at the second time, the client machine cannot acquire
the IP again.

The only way is to remove the /var/lib/dhcp/dhcpd.leases file in
server and restart the dhcpd service. Then the client machine can get
the IP again. That means if I want to boot the client machine from
network again, I should manully remove the leases file and restart the
dhcp service.

I have tried to run dhcp like this: dhcpd -d, it will print out some
debug info, I found the first time the client machine sent a
DHCPDISCOVER msg and server responsed the DHCPOFFER, then the client
sent a DHCPREQUEST and the server reponsed DHCPACK. But the second time,
the dhcpd didn't print anything out?! Why?

That's it. Thanks a lot for any suggestions.

Eric Zhang
2007-06-15

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Re: Client machine cannot acquire the IP from dhcp server [ In reply to ]

g.esp at free

Jun 14, 2007, 11:17 PM

Post #2 of 4 (2422 views)

Permalink

----- Original Message -----
From: "Eric Zhang" <maillistbox@126.com>
To: "For discussion of SYSLINUX and tftp-hpa" <syslinux@zytor.com>
Sent: Friday, June 15, 2007 7:22 AM
Subject: [syslinux] Client machine cannot acquire the IP from dhcp server

> Hi, syslinux:
>
> I use pxelinux to install Linux from network. Currently, my problem
is:
>
> The first time, the client machine can acquire the IP address from
> dhcp server but at the second time, the client machine cannot acquire
> the IP again.
>
> The only way is to remove the /var/lib/dhcp/dhcpd.leases file in
> server and restart the dhcpd service. Then the client machine can get
> the IP again. That means if I want to boot the client machine from
> network again, I should manully remove the leases file and restart the
> dhcp service.
>
> I have tried to run dhcp like this: dhcpd -d, it will print out some
> debug info, I found the first time the client machine sent a
> DHCPDISCOVER msg and server responsed the DHCPOFFER, then the client
> sent a DHCPREQUEST and the server reponsed DHCPACK. But the second time,
> the dhcpd didn't print anything out?! Why?
>
Wich dhcp server version?
What time duration for lease renewal is defined?

Gilles

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Re: Client machine cannot acquire the IP from dhcp server [ In reply to ]

maillistbox at 126

Jun 15, 2007, 3:14 AM

Post #3 of 4 (2433 views)

Permalink

Hi, Gilles:

My DHCP Server version is: dhcp-3.0.1-58.EL4(CentOS 4.4 OS)

My /etc/dhcpd.conf:

======================================================================================
allow booting;
ddns-update-style none;
option domain-name "jointforce.com.cn";
option subnet-mask 255.255.255.0;
option broadcast-address 192.168.0.255;
option domain-name-servers 218.2.135.1;
option routers 192.168.0.254;
subnet 192.168.0.0 netmask 255.255.255.0 {
range 192.168.0.1 192.168.0.64;
next-server 192.168.0.254;
filename "pxelinux.0";
}
======================================================================================

Gilles Espinasse wrote:
> ----- Original Message -----
> From: "Eric Zhang" <maillistbox@126.com>
> To: "For discussion of SYSLINUX and tftp-hpa" <syslinux@zytor.com>
> Sent: Friday, June 15, 2007 7:22 AM
> Subject: [syslinux] Client machine cannot acquire the IP from dhcp server
>
>
>> Hi, syslinux:
>>
>> I use pxelinux to install Linux from network. Currently, my problem
> is:
>> The first time, the client machine can acquire the IP address from
>> dhcp server but at the second time, the client machine cannot acquire
>> the IP again.
>>
>> The only way is to remove the /var/lib/dhcp/dhcpd.leases file in
>> server and restart the dhcpd service. Then the client machine can get
>> the IP again. That means if I want to boot the client machine from
>> network again, I should manully remove the leases file and restart the
>> dhcp service.
>>
>> I have tried to run dhcp like this: dhcpd -d, it will print out some
>> debug info, I found the first time the client machine sent a
>> DHCPDISCOVER msg and server responsed the DHCPOFFER, then the client
>> sent a DHCPREQUEST and the server reponsed DHCPACK. But the second time,
>> the dhcpd didn't print anything out?! Why?
>>
> Wich dhcp server version?
> What time duration for lease renewal is defined?
>
> Gilles
>
> _______________________________________________
> SYSLINUX mailing list
> Submissions to SYSLINUX@zytor.com
> Unsubscribe or set options at:
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>
>
>

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Re: Client machine cannot acquire the IP from dhcp server [ In reply to ]

stappers at stappers

Jun 16, 2007, 6:16 AM

Post #4 of 4 (2443 views)

Permalink

Op 15-06-2007 om 18:14 schreef Eric Zhang:
> Gilles Espinasse wrote:
> > ----- Original Message -----
> > From: "Eric Zhang" <maillistbox@126.com>
> > Sent: Friday, June 15, 2007 7:22 AM
> >
> >
> >> Hi, syslinux:
> >>
> >> The first time, the client machine can acquire the IP address from
> >> dhcp server but at the second time, the client machine cannot acquire
> >> the IP again.
> >>
> >> I have tried to run dhcp like this: dhcpd -d, it will print out some
> >> debug info, I found the first time the client machine sent a
> >> DHCPDISCOVER msg and server responsed the DHCPOFFER, then the client
> >> sent a DHCPREQUEST and the server reponsed DHCPACK. But the second time,
> >> the dhcpd didn't print anything out?! Why?
> >>
> > Which dhcp server version?
>
> Hi, Gilles:
>
> My DHCP Server version is: dhcp-3.0.1-58.EL4(CentOS 4.4 OS)
>
> My /etc/dhcpd.conf:
>
> ======================================================================================
> allow booting;
> ddns-update-style none;
> option domain-name "jointforce.com.cn";
> option subnet-mask 255.255.255.0;
> option broadcast-address 192.168.0.255;
> option domain-name-servers 218.2.135.1;
> option routers 192.168.0.254;
> subnet 192.168.0.0 netmask 255.255.255.0 {
> range 192.168.0.1 192.168.0.64;
> next-server 192.168.0.254;
> filename "pxelinux.0";
> }
> ====================================================================

> > What time duration for lease renewal is defined?

That question is still unanswered. ( Replying below the question more
advantages then a good readable mailinglist archive )

The manual of the ISC DHCP server has this example:

subnet 239.252.197.0 netmask 255.255.255.0 {
range 239.252.197.10 239.252.197.107;
default-lease-time 600;
max-lease-time 7200;
}

My advice is to play with the lease-time options.

Back to the original posting:

> >> I found the first time the client machine sent a
> >> DHCPDISCOVER msg and server responsed the DHCPOFFER, then the client
> >> sent a DHCPREQUEST and the server reponsed DHCPACK. But the second time,
> >> the dhcpd didn't print anything out?! Why?

What is the second time the client does talk to the DHCP server?

And what states that the DHCP server does get the second message
from the DHCP client?

Those are two seperate questions ( please answer both seperately ).
The second question is the important one, it implies an 'are you sure
that the client was actual able to send out the "second" request?'

Hope this Helps
Geert Stappers

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