Strange behavior No Gateway address after successful IP lease on ISC DHCP Server 4.1

Wed Oct 28 13:39:51 UTC 2015

Hi Patrick,No static entry on work station. I'm preparing to test with a different device to verify the behavior. Currently we have 2x routers defined I will check it with single router IP.
Yes  verified the DHCP packets the required information is there in the dhcp options.
Yes, only Gigaset-SX686 is send message size parameter in client side signaling.
I will share the feedback one have tested as mentioned in the begining. Regards, Muhammad Faisal.

      From: Patrick Trapp <ptrapp at nex-tech.com>
 To: Muhammad Faisal <faisalusuf at yahoo.com>; Users of ISC DHCP <dhcp-users at lists.isc.org>; Judy Hao <Judy.Hao at brocade.com> 
 Sent: Wednesday, October 28, 2015 6:33 PM
 Subject: RE: Strange behavior No Gateway address after successful IP lease on ISC DHCP Server 4.1

I don't believe you answered Judy's question. Related to that - is there a static entry on this workstation that is conflicting with what DHCP would be returning?

You looked at the messages between the client and server. Did you confirm that the packets coming from the DHCP server have the data you expect?

Are there other Gigaset SX686 on the network? That is, when you are comparing your failing host to a working host, are you comparing it to a similar piece of hardware? I'm curious about the implication that the Message Size parameter is only being sent from a single host - what is the DHCP server's response to that parameter, if any?

From: dhcp-users-bounces at lists.isc.org [dhcp-users-bounces at lists.isc.org] on behalf of Muhammad Faisal [faisalusuf at yahoo.com]
Sent: Tuesday, October 27, 2015 11:50 PM
To: Judy Hao; Users of ISC DHCP
Subject: Re: Strange behavior No Gateway address after successful IP lease on ISC DHCP Server 4.1

Hi Judy,Thanks for your response.There is only one dhcp client which has unusual behavior. Rest of the clients are normally working on the same server. Any clue? Regards, Muhammad Faisal.

From: Judy Hao <Judy.Hao at brocade.com>
To: Muhammad Faisal <faisalusuf at yahoo.com>; Users of ISC DHCP <dhcp-users at lists.isc.org>
Sent: Wednesday, October 28, 2015 3:41 AM
Subject: RE: Strange behavior No Gateway address after successful IP lease on ISC DHCP Server 4.1

#yiv9886018642 #yiv9886018642 -- -- filtered {font-family:Helvetica;}#yiv9886018642 filtered {font-family:Helvetica;}#yiv9886018642 filtered {font-family:Calibri;}#yiv9886018642 filtered {font-family:Tahoma;}#yiv9886018642 p.yiv9886018642MsoNormal, #yiv9886018642 li.yiv9886018642MsoNormal, #yiv9886018642 div.yiv9886018642MsoNormal {margin:0in;margin-bottom:.0001pt;font-size:12.0pt;}#yiv9886018642 a:link, #yiv9886018642 span.yiv9886018642MsoHyperlink {color:#0563C1;text-decoration:underline;}#yiv9886018642 a:visited, #yiv9886018642 span.yiv9886018642MsoHyperlinkFollowed {color:#954F72;text-decoration:underline;}#yiv9886018642 span.yiv9886018642EmailStyle17 {color:#44546A;}#yiv9886018642 .yiv9886018642MsoChpDefault {font-size:10.0pt;}#yiv9886018642 filtered {margin:1.0in 1.0in 1.0in 1.0in;}#yiv9886018642 #yiv9886018642 BODY {direction:ltr;font-family:Tahoma;color:#000000;font-size:10pt;}#yiv9886018642 P {margin-top:0;margin-bottom:0;}As far as I understand, you can have only one default route and the router must be reachable on your Linux host. Check whether there is already a default route on your DHCP client host. Also check whether you can ping the router (10.0.0.1, 10.0.0.2 in your case) on your DHCP client host. Thanks,Judy 

From: dhcp-users-bounces at lists.isc.org [mailto:dhcp-users-bounces at lists.isc.org]On Behalf Of Muhammad Faisal
Sent: Tuesday, October 27, 2015 11:10 AM
To: dhcp-users at lists.isc.org
Subject: Strange behavior No Gateway address after successful IP lease on ISC DHCP Server 4.1 Hello Experts,We have configured the DHCP Server using ISC DHCP server version 4.1 on CentOS. The server deployment remain successful and most of the host are acquiring IP address normally. On of the host is successfully acquiring IP but not the default gateway which is defined in the server as "option routers" parameter under dhcp scope. I have tried to compare the message of working host with that of problematic one the following differences I have found: 1- Message Size parameter is sent by the problematic client which is a modem Gigaset SX6862- All the messages are same on both problematic client and normal client 3- DHCP is successfully leasing the IP I have tried hit and trials but no success. The server is operating with default parameters. Can someone please suggest. #   see 'man 5 dhcpd.conf'#ddns-update-style none;authoritative;one-lease-per-client true;log-facility local0;default-lease-time 600;max-lease-time 600;get-lease-hostnames false;#   parameters for LAN        subnet 10.0.0.0 netmask 255.255.255.0 {        option routers 10.0.0.1, 10.0.0.2;        option subnet-mask 255.255.255.0;        option broadcast-address 10.0.0.255;        option domain-name-servers 10.0.0.3, 8.8.8.8;        option interface-mtu 1500;        range 10.0.0.4 10.0.0.254;} Regards, Muhammad Faisal.

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