<div dir="ltr">Hello,<div><br>I have a multi-node install of openstack havana. Until yesterday I had all the nodes and instances with proper connectivity, using FlatDHCPManager.</div><div><br></div><div>Today, when I tried to check connectivity, all compute hosts are unable to send a ping outside the machine. Curiously, the instances are still able to use the br100 and ping outside their respective hosts. Also, I am able to ping the host from outside. (i.e. ping works in reverse direction).</div>
<div><br></div><div>=========</div><div>Ping from host(wind - eth0:10.10.1.13) to outside(10.10.1.10)</div><div>==========</div><div><div>xxxx@wind:~$ ping 10.10.1.10</div><div>PING 10.10.1.10 (10.10.1.10) 56(84) bytes of data.</div>
<div>From 10.10.1.1 icmp_seq=1 Destination Host Unreachable</div><div>From 10.10.1.1 icmp_seq=2 Destination Host Unreachable</div><div>From 10.10.1.1 icmp_seq=3 Destination Host Unreachable</div></div><div><br></div><div>
It is curious that ping says "From 10.10.1.1". I am unable to understand this. It is as if br100 has taken over eth0 as the default interface. <br><br></div><div>===========</div><div>route -n on host(wind)</div>
<div>===========</div><div><div>ncsu@wind:~$ route -n</div><div>Kernel IP routing table</div><div>Destination Gateway Genmask Flags Metric Ref Use Iface</div><div>0.0.0.0 192.168.1.10 0.0.0.0 UG 100 0 0 eth1</div>
<div>10.0.3.0 0.0.0.0 255.255.255.0 U 0 0 0 lxcbr0</div><div>10.10.1.0 0.0.0.0 255.255.255.0 U 0 0 0 br100</div><div>10.10.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0</div>
<div>192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1</div></div><div><br></div><div>==========================</div><div>relevant interface information for wind</div><div>=============================</div>
<div>eth0 - <a href="http://10.10.1.13/24">10.10.1.13/24</a> </div><div>br100 - 10.10.1.1</div><div>eth1 - 192.168.1.13 (mgmt interface)</div><div><br></div><div>I've tried restarting nova services and rebooting to no avail. I am unable to troubleshoot it. Any ideas? </div>
<div><br></div><div>Naman</div><div><br></div><div>ps: I did notice that I was tinkering with NATs and iptables before this happened. </div><div><br></div></div>