I would like also to add something may helps; that I did the devstack installation before on Centos and I did not fce this problem, but Now I am using Ubuntu 14.04 so may be the issue is here ?<div><br></div><div>Best regards,</div><div>Ahmed<span></span><br><br>On Monday, June 20, 2016, Ahmed Medhat <<a href="mailto:a.medhat.h@gmail.com">a.medhat.h@gmail.com</a>> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">i add it but it is not working also.<div>May be This iptables <span></span>rule for traffic reaching the dhcp port but there should be one in the other direction and be dport 67 ?</div><div><br></div><div>Best regards,</div><div>Ahmed<br><br>On Monday, June 20, 2016, Neil Jerram <<a href="javascript:_e(%7B%7D,'cvml','neil@tigera.io');" target="_blank">neil@tigera.io</a>> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>In that case I guess you are somehow missing the iptables rule that fills in the CHECKSUM properly on DHCP replies. Is the problem fixed if you add the following iptables rule in the DHCP namespace on the network node?<br><br>iptables -A POSTROUTING -t mangle -p udp --dport 68 -j CHECKSUM --checksum-fill<br><br></div> Neil<br><br><div><br><br></div></div><br><div class="gmail_quote"><div dir="ltr">On Mon, Jun 20, 2016 at 9:30 AM Ahmed Medhat <<a>a.medhat.h@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi Neil,<div><br></div><div>Thanks for your reply.</div><div><br></div><div>I have done tcpdump on dhcp port of the private network in Openstack and I saw the received dhcp request and replies. It seems tgat the replies are not received to the VM.</div><div>I want to add tgat if I adjusted the ip manually inside the VM instance , it works fine and I can ping the dhcp ip 11.0.0.2 in my case.</div><div><br></div><div>I hope this info shows you where could be the problem I have.<span></span></div><div><br></div><div>Best regards,</div><div>Ahmed</div><div><br><br>On Monday, June 20, 2016, Neil Jerram <<a>neil@tigera.io</a>> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><div><div><div>Hi Ahmed,<br><br></div>Unfortunately there are many possible reasons - and different ones depending on your setup.<br><br></div>I will guess, though, that you're using a default OVS setup, without DVR. In that case DHCP should be provided by Dnsmasq running on your network node, and I would start by checking for that process and looking at its logs (which could be in /var/log/syslog, /var/log/messages, journalctl, ...) to see if there is any sign of DHCP requests being received, and then whether Dnsmasq sends any DHCP responses.<br><br></div>Regards,<br></div> Neil<br><br></div><br><div class="gmail_quote"><div dir="ltr">On Sat, Jun 18, 2016 at 1:34 PM Ahmed Medhat <<a>a.medhat.h@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Hi All,<div><br></div><div>I have installed kilo devstack and have a problem with dhcp, it is not assigning IPs to the VMs. </div><div>What are the reasons for that ?</div><div><br></div><div>Best regards,</div><div>Ahmed</div></div>
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