vm guest can ping first ip of floating ip range, but failed to ping gateway of floating ip

asked 2015-05-19 13:08:04 -0500

blanka gravatar image

Hi all, I met a problem that my guest vm which is located under a tenant network, and it can ping the first range of floating ip successfully, but it failed to ping the gateway of floating ip.

Host IP: gateway:

I followed the section of initial network section of ubuntu installation guide to build the network, steps are following:

neutron net-create ext-net --router:external \
--provider:physical_network external --provider:network_type flat

neutron subnet-create ext-net --name ext-subnet \
--allocation-pool start=,end= \
--disable-dhcp --gateway

neutron net-create admin-net

neutron subnet-create admin-net \
  --name admin-subnet --gateway

neutron router-create admin-router

neutron router-interface-add admin-router admin-subnet

neutron router-gateway-set admin-router ext-net

on the host side, I can ping the first ip of floating ip range which is

user@controller01:~$ ping
PING ( 56(84) bytes of data.
64 bytes from icmp_seq=9 ttl=64 time=0.440 ms
64 bytes from icmp_seq=10 ttl=64 time=0.071 ms
64 bytes from icmp_seq=11 ttl=64 time=0.067 ms
64 bytes from icmp_seq=12 ttl=64 time=0.091 ms

in the guest vm(ip: which is located under the tenant network whose ip ranage is, and is the gateway of tenant network

within the guest vm can ping, is br-ex ip) and is first ip of floating ip range (sorry, I tried to copy the ping results from guest vm but failed)

and the result of traceroute from guest vm to traveled 2 hubs and then stopped at


how should I trace furthur into the issue? thanks for your patient to finish my question!

edit retag flag offensive close merge delete