Open Stack

Hi Jingting,

just few general hints (probably already checked):

-          security group rules in openstack (check both igress, egress, ….) – it’s quite common that after deployment it’s have to be modified

-          Iptables / fw ? – check if some packets are dropped

-          Cross-check if vlan is properly configured on physical interfaces

-          If you use tunnels, ensure that both IP’s are on bridges not on ported NIC’s

Best regards,
Michal

From: 康敬亭 [mailto:jingting at unitedstack.com]
Sent: Thursday, March 03, 2016 4:20 AM
To: openstack-dev <openstack-dev at lists.openstack.org>
Subject: [openstack-dev] [Neutron] VM could not get IP from dhcp server

Hi guys:

I have openstack Liberty(linuxbridge + vxlan) installed, and the vm could not get IP from dhcp server.

Troubleshooting:
Using tcpdump can get dhcp discover packet on physical NIC on network node, but can't get it on vxlan port(vxlan-100) on network node.
In opposite direction, Sending arp broadcast  in dhcp namespace, and we can get packet on vxlan port(vxlan-100) but can't get packet on physical NIC.

However, we find port 8472 is being listened. Meanwhile all interfaces(vxlan-100, physical NIC) are up and running.

What could be the reason for the issue? Any comments are appreciated.

BR,
Jingting
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