QUERY REGARDING ISC DHCP CLIENT AND SERVER

Fri Nov 25 11:14:53 UTC 2011

Hi,	

	I have downloaded the ISC DHCP 4.2.3 and copied to client and server.I have included the client and server output below.

IN CLIENT SIDE
---------------

[root at localhost sbin]# ./dhclient -6 -d 
Internet Systems Consortium DHCP Client 4.2.3
Copyright 2004-2011 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/

Bound to *:546
Listening on Socket/eth0
Sending on   Socket/eth0
PRC: Soliciting for leases (INIT).
XMT: Forming Solicit, 0 ms elapsed.
XMT:  X-- IA_NA 17:be:6f:b8
XMT:  | X-- Request renew in  +3600
XMT:  | X-- Request rebind in +5400
XMT: Solicit on eth0, interval 1080ms.
XMT: Forming Solicit, 1080 ms elapsed.
XMT:  X-- IA_NA 17:be:6f:b8
XMT:  | X-- Request renew in  +3600
XMT:  | X-- Request rebind in +5400
XMT: Solicit on eth0, interval 2210ms.
XMT: Forming Solicit, 3290 ms elapsed.
XMT:  X-- IA_NA 17:be:6f:b8
XMT:  | X-- Request renew in  +3600
XMT:  | X-- Request rebind in +5400
XMT: Solicit on eth0, interval 4310ms.
XMT: Forming Solicit, 7600 ms elapsed.
XMT:  X-- IA_NA 17:be:6f:b8
XMT:  | X-- Request renew in  +3600
XMT:  | X-- Request rebind in +5400
XMT: Solicit on eth0, interval 8980ms.

[root at localhost ~]# pwd
/root
[root at localhost ~]# tail -f /var/log/messages
Nov 26 02:20:46 localhost dhclient: All rights reserved.
Nov 26 02:20:46 localhost dhclient: For info, please visit https://www.isc.org/software/dhcp/
Nov 26 02:20:46 localhost dhclient: 
Nov 26 02:20:46 localhost dhclient: Bound to *:546
Nov 26 02:20:46 localhost dhclient: Listening on Socket/eth0
Nov 26 02:20:46 localhost dhclient: Sending on   Socket/eth0
Nov 26 02:20:46 localhost dhclient: XMT: Solicit on eth0, interval 1040ms.
Nov 26 02:20:47 localhost dhclient: XMT: Solicit on eth0, interval 2060ms.
Nov 26 02:20:49 localhost dhclient: XMT: Solicit on eth0, interval 4200ms.
Nov 26 02:20:53 localhost dhclient: XMT: Solicit on eth0, interval 8640ms.
Nov 26 02:21:02 localhost dhclient: XMT: Solicit on eth0, interval 17070ms.
Nov 26 02:21:19 localhost dhclient: XMT: Solicit on eth0, interval 34400ms.
Nov 26 02:21:53 localhost dhclient: XMT: Solicit on eth0, interval 65760ms.

IN SERVER SIDE
--------------

[root at localhost sbin]# ifconfig eth0 inet6 add 3ffe:501:ffff:100::/64
[root at localhost sbin]# ./dhcpd -6 -d -cf dhcpd-dhcpv6.conf 
Internet Systems Consortium DHCP Server 4.2.3
Copyright 2004-2011 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/
Wrote 0 deleted host decls to leases file.
Wrote 0 new dynamic host decls to leases file.
Wrote 0 leases to leases file.
Bound to *:547
Listening on Socket/5/eth0/3ffe:501:ffff:100::/64
Sending on   Socket/5/eth0/3ffe:501:ffff:100::/64

My problem
----------

Server is listening on interface(3ffe:501:ffff:100::/64) 

Client able to send solicit message.

Server able to receive solicit message from client( have checked using tcpdump command)

But after that there is is no communication between them .

I don't know what is the problem actually.

Please let me know what would be the reason.

I can able to get advertise ,request , response message. I can able to send solicit message solicit message only.

Please provide solution.

Regards,
Ameen S

------------------------------------------------------------------------------------------

-----Original Message-----
From: dhcp-users-bounces+ameen.shajahan=wipro.com at lists.isc.org [mailto:dhcp-users-bounces+ameen.shajahan=wipro.com at lists.isc.org] On Behalf Of Glenn Satchell
Sent: 25 November 2011 16:01
To: Users of ISC DHCP
Subject: Re: QUERY REGARDING ISC DHCP CLIENT

This looks like the culprit:

Nov 25 22:22:40 localhost setroubleshoot: SELinux is preventing 
dhclient-script (dhcpc_t) "read" to /var/db/dhclient.leases (var_t). For 
complete SELinux messages. run sealert -l 
5213ea25-1a6a-470c-ba8d-b1ce9663bb1a

SELinux provides manadatory access control to files, sockets, processes, 
etc. You need to read up on SE Linux and how to adjust the settings so 
that dhcpd can read that file. Until then it will never work.

regards,
-glenn

On 11/25/11 17:59, ameen.shajahan at wipro.com wrote:
> Hi,
>
> I have included my output in client side using ISC DHCP 4.2.3
>
> [root at localhost client]# ls
>
> clparse.c dhc6.o dhclient.c dhclient.leases.5 Makefile scripts
>
> clparse.o dhclient dhclient.conf dhclient.o Makefile.am
>
> dhc6.c dhclient.8 dhclient.conf.5 dhclient-script.8 Makefile.in
>
> [root at localhost client]# ./dhclient -d
>
> Internet Systems Consortium DHCP Client 4.2.3
>
> Copyright 2004-2011 Internet Systems Consortium.
>
> All rights reserved.
>
> For info, please visit https://www.isc.org/software/dhcp/
>
> /sbin/dhclient-script: configuration for not found. Continuing with
> defaults.
>
> basename: missing operand
>
> Try `basename --help' for more information.
>
> /etc/sysconfig/network-scripts/network-functions: line 78: .: filename
> argument required
>
> .: usage: . filename [arguments]
>
> No broadcast interfaces found - exiting.
>
> After that I saw the log messages for this above problem and it stating
> that,
>
> [root at localhost client]# tail -f /var/log/messages
>
> Nov 25 22:20:06 localhost dhclient: XMT: Solicit on eth0, interval 127770ms.
>
> Nov 25 22:22:14 localhost dhclient: XMT: Solicit on eth0, interval 121340ms.
>
> Nov 25 22:22:40 localhost dhclient: Internet Systems Consortium DHCP
> Client 4.2.3
>
> Nov 25 22:22:40 localhost dhclient: Copyright 2004-2011 Internet Systems
> Consortium.
>
> Nov 25 22:22:40 localhost dhclient: All rights reserved.
>
> Nov 25 22:22:40 localhost dhclient: For info, please visit
> https://www.isc.org/software/dhcp/
>
> Nov 25 22:22:40 localhost dhclient:
>
> Nov 25 22:22:40 localhost setroubleshoot: SELinux is preventing
> dhclient-script (dhcpc_t) "read" to /var/db/dhclient.leases (var_t). For
> complete SELinux messages. run sealert -l
> 5213ea25-1a6a-470c-ba8d-b1ce9663bb1a
>
> Nov 25 22:22:40 localhost dhclient: No broadcast interfaces found - exiting.
>
> Nov 25 22:24:15 localhost dhclient: XMT: Solicit on eth0, interval 109710ms.
>
> Please let me know what would be the reason for this error
> (/sbin/dhclient-script: configuration for not found. Continuing with
> defaults).
>
> Thanks,
>
> Ameen S
>
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