On 01/04/2017 03:22 AM, zhaolihuisky wrote:
hi, all
I have a problem about that vm can not get ip address by dnsmasq server.
I have got the DHCP packets by tcpdump.
With the DHCP protocol, client send DHCP Discover, and then server reply DHCP
Offer, next client send DHCP Request and server reply DHCP ACK, at last vm get
ip address.
But in my openstack env, only one vm can not get ip address, and others could
get a ip address.
By analysing the DHCP protocol packets (see attachment), I found that vm send
DHCP Discover, but dnsmasq didn't reply DHCP Offer.
Did dnsmasq log anything on receipt of the packet? Does the host file in
/opt/stack/data/neutron/dhcp/* have information for this VM? Do you have any
iptables rules that might be causing it? I'm assuming the trace was taken
inside the dhcp namespace so you know the packet got that far?
Since you can reproduce it with this one VM you can hopefully track it down, but
there's nothing in your explanation that points at a particular issue in neutron.
-Brian
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