<div dir="ltr">Hi David,<div><br></div><div>The interface name "eth1" implies - or at least strongly suggests - that each of your VMs has two interfaces (eth0 and eth1).  Is that the case?</div><div><br></div><div>It's also a bit odd that you have to do 'ifconfig eth1 up' by hand.  Normally the VM OS should do that; and if it isn't, there are probably other things that aren't happening for eth1, such as DHCP and setting up the routing table for it.</div><div><br></div><div>Could you do what you're trying to do first with just one VM interface, eth0, which OpenStack should fully set up for you?</div><div><br></div><div>       Neil</div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr">On Tue, Mar 14, 2017 at 10:51 AM David Gabriel <<a href="mailto:davidgab283@gmail.com">davidgab283@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" class="gmail_msg"><span style="font-size:12.8px" class="gmail_msg">Dears,</span><div style="font-size:12.8px" class="gmail_msg"><br class="gmail_msg"></div><div style="font-size:12.8px" class="gmail_msg">I have defined this simple topology: </div><div style="font-size:12.8px" class="gmail_msg">                    Internet ----- VM1 ----LAN---- VM2 -----Internet </div><div style="font-size:12.8px" class="gmail_msg"><br class="gmail_msg"></div><div class="gmail_msg"><div style="font-size:12.8px" class="gmail_msg"><div class="gmail_msg"><span style="font-size:12.8px" class="gmail_msg">I made 'ifconfig eth1 up' for each VM to activate the interface.</span></div><div class="gmail_msg"><span style="font-size:12.8px" class="gmail_msg">Then I tried to make the ping between the two VMs but it fails !</span><br class="gmail_msg"></div><div class="gmail_msg"><span style="font-size:12.8px" class="gmail_msg"><br class="gmail_msg"></span></div></div><div style="font-size:12.8px" class="gmail_msg"><span style="font-size:12.8px" class="gmail_msg">So I run the bellow command in one VM and re-run the ping in the other one</span></div><div class="gmail_msg"><span style="font-size:12.8px" class="gmail_msg">tcpdump -i eth1 icmp and icmp[icmptype]=icmp-echo</span><br class="gmail_msg"></div><div class="gmail_msg"><span style="font-size:12.8px" class="gmail_msg">But I did not receive any packet despite that ICMP packets are allowed in both directions (IN/OUT) !</span></div><div style="font-size:12.8px" class="gmail_msg"><span style="font-size:12.8px" class="gmail_msg"><br class="gmail_msg"></span></div></div><div style="font-size:12.8px" class="gmail_msg">Could you please tell me how to fix this problem.</div><div style="font-size:12.8px" class="gmail_msg"><br class="gmail_msg"></div><div style="font-size:12.8px" class="gmail_msg">Thanks in advance.</div><div style="font-size:12.8px" class="gmail_msg">Regards</div></div>
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