<html>
<head>
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
</head>
<body bgcolor="#FFFFFF" text="#000000">
<div class="moz-cite-prefix">Hi Ritual,<br>
<br>
It would have to be enabled, by default, IP Source Guard is
disabled on all interfaces. <br>
Would have in the running-config on interface setup: 'ip verify
source dhcp-snooping'<br>
Check your logs on the n5k, see if any logs for dhcp-snooping
blocks if it is enabled. Not sure it is logged, we do not use on
our n5k, only have three in controlled data center so not that
much experience.<br>
<br>
~IP Source Guard<br>
<a class="moz-txt-link-rfc2396E" href="http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5000/sw/security/503_n1_1/b_Cisco_n5k_security_config_gd_rel_503_n1_1/Cisco_n5k_security_config_gd_rel_503_n1_1_chapter10.html#con_1097286"><http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5000/sw/security/503_n1_1/b_Cisco_n5k_security_config_gd_rel_503_n1_1/Cisco_n5k_security_config_gd_rel_503_n1_1_chapter10.html#con_1097286></a><br>
<br>
~dhcp snooping;<br>
<a class="moz-txt-link-rfc2396E" href="http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5000/sw/security/503_n1_1/b_Cisco_n5k_security_config_gd_rel_503_n1_1/Cisco_n5k_security_config_gd_rel_503_n1_1_chapter8.html"><http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5000/sw/security/503_n1_1/b_Cisco_n5k_security_config_gd_rel_503_n1_1/Cisco_n5k_security_config_gd_rel_503_n1_1_chapter8.html></a><br>
<br>
Not that related, (shows the dhcp-snooping/ip source guard is good
to check), had HP switches that broke PXE booting due to firmware
problems years ago. To work around disabled dhcp-snooping on HP
switches until firmware fix released on HP model with the problem.
Also if separate PXE server on a different port than the dhcp
server, have to allow both the dhcp server port and PXE server
port as trusted. Only matters if using dhcp-snooping and have two
servers on different ports.<br>
<br>
Might be best to Wireshark sniff the wire on each side to see
where the break down is occurring after checking above.<br>
<br>
best!<br>
jim <br>
<br>
<br>
<br>
<br>
On 4/2/2014 5:55 AM, ritul guru (riguru) wrote:<br>
</div>
<blockquote
cite="mid:48E9E80D4F6A8743A943E970CBD872334DEF19@xmb-rcd-x05.cisco.com"
type="cite">
<meta http-equiv="Content-Type" content="text/html;
charset=ISO-8859-1">
<meta name="Generator" content="Microsoft Word 14 (filtered
medium)">
<base href="x-msg://2/">
<style><!--
/* Font Definitions */
@font-face
{font-family:Helvetica;
panose-1:2 11 6 4 2 2 2 2 2 4;}
@font-face
{font-family:Helvetica;
panose-1:2 11 6 4 2 2 2 2 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman","serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
p.MsoAcetate, li.MsoAcetate, div.MsoAcetate
{mso-style-priority:99;
mso-style-link:"Balloon Text Char";
margin:0in;
margin-bottom:.0001pt;
font-size:8.0pt;
font-family:"Tahoma","sans-serif";}
span.EmailStyle17
{mso-style-type:personal;
font-family:"Calibri","sans-serif";
color:#1F497D;
font-weight:normal;
font-style:normal;}
span.BalloonTextChar
{mso-style-name:"Balloon Text Char";
mso-style-priority:99;
mso-style-link:"Balloon Text";
font-family:"Tahoma","sans-serif";}
span.EmailStyle20
{mso-style-type:personal-reply;
font-family:"Calibri","sans-serif";
color:#1F497D;
font-weight:normal;
font-style:normal;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
<div class="WordSection1">
<p class="MsoNormal"><span
style="font-family:"Calibri","sans-serif";color:#1F497D">How
can I check if IP source guard is enabled for a port on
switch?<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #B5C4DF
1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
<a class="moz-txt-link-abbreviated" href="mailto:dhcp-users-bounces+riguru=cisco.com@lists.isc.org">dhcp-users-bounces+riguru=cisco.com@lists.isc.org</a>
[<a class="moz-txt-link-freetext" href="mailto:dhcp-users-bounces+riguru=cisco.com@lists.isc.org">mailto:dhcp-users-bounces+riguru=cisco.com@lists.isc.org</a>]
<b>On Behalf Of </b>ritul guru (riguru)<br>
<b>Sent:</b> Wednesday, April 02, 2014 2:31 PM<br>
<b>To:</b> Users of ISC DHCP<br>
<b>Subject:</b> RE: Client not sending DHCPREQUEST after
offer.<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span
style="font-family:"Calibri","sans-serif";color:#1F497D">I
am not sure, but I am able to do legacy boot on same client
port (switch N5k).<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Calibri","sans-serif";color:#1F497D">So
this should not be a concern.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Calibri","sans-serif";color:#1F497D">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Calibri","sans-serif";color:#1F497D">Ritul<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #B5C4DF
1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
<a moz-do-not-send="true"
href="mailto:dhcp-users-bounces+riguru=cisco.com@lists.isc.org">dhcp-users-bounces+riguru=cisco.com@lists.isc.org</a>
[<a moz-do-not-send="true"
href="mailto:dhcp-users-bounces+riguru=cisco.com@lists.isc.org">mailto:dhcp-users-bounces+riguru=cisco.com@lists.isc.org</a>]
<b>On Behalf Of </b>Joseph Bernard<br>
<b>Sent:</b> Sunday, March 30, 2014 4:55 AM<br>
<b>To:</b> Users of ISC DHCP<br>
<b>Subject:</b> Re: Client not sending DHCPREQUEST after
offer.<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Is the client on a port using IP Source
Guard by any chance?
<o:p></o:p></p>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">Joseph B.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<div>
<p class="MsoNormal">On Mar 29, 2014, at 3:26 PM, "ritul
guru (riguru)" <<a moz-do-not-send="true"
href="mailto:riguru@cisco.com">riguru@cisco.com</a>><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"> wrote:<o:p></o:p></p>
</div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><o:p> </o:p></p>
<div>
<div>
<p class="MsoNormal"><span
style="font-family:"Calibri","sans-serif";color:#1F497D">Hi,</span><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-family:"Calibri","sans-serif";color:#1F497D">I
am facing similar problem while trying to boot to
uefi rhel6.5 OS through uefi pxe boot.</span><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-family:"Calibri","sans-serif";color:#1F497D"> </span><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-family:"Calibri","sans-serif";color:#1F497D">Pxe
client sends DHCPDISCOVER and server is reverting
with DHCPOFFER, but this keeps on happening, client
is not sending DHCPREQUEST further.</span><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-family:"Calibri","sans-serif";color:#1F497D"> </span><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""><image001.png><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-family:"Calibri","sans-serif";color:#1F497D"> </span><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-family:"Calibri","sans-serif";color:#1F497D">I
tried dumping pxe server on eth2, it looks like pxe
client DHCPREQUEST is not reaching the server. What
could be the problem?</span><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-family:"Calibri","sans-serif";color:#1F497D"> </span><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""><image002.png><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-family:"Calibri","sans-serif";color:#1F497D"> </span><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-family:"Calibri","sans-serif";color:#1F497D"> </span><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-family:"Calibri","sans-serif";color:#1F497D"> </span><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-family:"Calibri","sans-serif";color:#1F497D"> </span><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-family:"Calibri","sans-serif";color:#1F497D">Regards,</span><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-family:"Calibri","sans-serif";color:#1F497D">Ritul</span><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""> <o:p></o:p></span></p>
</div>
<p class="MsoNormal"><span
style="font-size:13.5pt;font-family:"Helvetica","sans-serif"">_______________________________________________<br>
dhcp-users mailing list<br>
<a moz-do-not-send="true"
href="mailto:dhcp-users@lists.isc.org"><span
style="color:purple">dhcp-users@lists.isc.org</span></a><br>
<a moz-do-not-send="true"
href="https://lists.isc.org/mailman/listinfo/dhcp-users"><span
style="color:purple">https://lists.isc.org/mailman/listinfo/dhcp-users</span></a><o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
dhcp-users mailing list
<a class="moz-txt-link-abbreviated" href="mailto:dhcp-users@lists.isc.org">dhcp-users@lists.isc.org</a>
<a class="moz-txt-link-freetext" href="https://lists.isc.org/mailman/listinfo/dhcp-users">https://lists.isc.org/mailman/listinfo/dhcp-users</a></pre>
</blockquote>
<br>
</body>
</html>