[Dnsmasq-discuss] DNSMASQ wrong addresses allocated after changing DHCP Clients between Neutron vRouters
Luis Kleber
luis.kleber at gmail.com
Mon Nov 26 18:42:05 GMT 2018
Hi,
I'm using OpenStack, basically creating Virtual Routers with subnets, and
DNSMASQ is the DHCP Server for them (via neutron-dhcp driver).
My test scenario contains 2 vRouters (2 namespaces as router) with 1 DHCP
each (2 namespaces as dhcp servers) on the Neutron Network Server. The
Subnet are 100.97.97.0/24 for NET with VLAN 997, and Subnet 100.98.98.0/24
for Network with VLAN 998. Both are on the same physical interface.
The 2 DHCP servers have available .11 to .64 IP address range (54
addresses). (dnsmasq config file is bellow)
I'm generation 60 MAC addresses randomly as source MAC address to test DHCP
Client requests. Theses 60 addresses are always the same.
The DHCP Client script tester is connected to Network with VLAN 997 and
subnet 100.97.97.0/24. I generate DHCP client MAC addresses and only 54 are
allocated, as expected. So, addresses from range 100.97.97.11 to
100.97.97.64 are allocated to client requests. This is OK. Then I stop the
DHCP client script tester. (script bellow)
When the DHCP lease timer start expire on this DHCP Server, about 600s
after the first address allocated (it means, start cleaning entries from
/var/lib/neutron/dhcp/xxx/leases file), and when some addresses were
cleaned, then I change the native VLAN where the DHCP Client tester is
connected (it means, change the LAN for VLAN 998 network). So, the
"randomly" DHCP client requests (60 addresses), are requesting IP address
in the new network. Then, addresses from range 100.98.98.11 to 100.98.98.64
should be allocated to client requests. Normally it works.
The problems is, sometimes after this "LAN changing", the addresses
allocated are from a wrong NET. When it happens, the allocated addresses
always are from 100.101.1.0/24 network (.11 to .64 too). There is no
vROUTER an DHCP Server running whit this subnet. like shown bellow.
[root at devel91 (keystone_admin)] openstack subnet list
+--------------------------------------+---------------------------------------------------+--------------------------------------+-------------------+
| ID | Name
| Network | Subnet |
+--------------------------------------+---------------------------------------------------+--------------------------------------+-------------------+
| 2ede81d1-9d2d-4df9-9e1e-f0cdf0275fbe | ext-subnet-pub-1
| bf2c1841-e09b-4a00-8911-25893ccbf948 | 100.100.0.0/24 |
| 3c3082ce-236e-4ebf-944a-1f0e2b57d309 | vROUTER-997-subnet
| 3a07cc53-9944-4420-9b76-fa32e41922f5 | 100.97.97.0/24 |
| 4a0adcce-d58e-4b9e-b824-cde0eff3710e | vROUTER-998-subnet
| 6a8e6738-fc6e-4f06-a714-3f00eb50e3a5 | 100.98.98.0/24 |
| 5bcabde7-41a2-4ce2-b87a-f18c6118d2a0 | HA subnet tenant
56700656a9054052aada06b11465e9d7 | 6bc8e3a4-ee15-4434-8cb8-03b6428add26 |
169.254.192.0/18 |
| 7f7ab506-ab88-457c-9dd0-8852a44f49e7 | HA subnet tenant
0cd6a586a6514322a7ba4df687c3c4c0 | e1fe8a2f-4718-47a5-8b15-3de3e7953def |
169.254.192.0/18 |
| a7483019-5df4-4f86-adde-589b53511f86 | ext-subnet-pub-2
| ff831342-d2e1-4351-8703-a2e43cfb0653 | 10.20.30.232/30 |
| a9fda48a-b443-4b94-89e7-d2a9dc7e092a | HA subnet tenant
d5c16d8aa5c84fa28ffa7a2d3cef87bf | 1746fba2-1b82-4c4a-92ea-d09c605d5404 |
169.254.192.0/18 |
+--------------------------------------+---------------------------------------------------+--------------------------------------+-------------------+
[root at devel91 (keystone_admin)]
The problem seems to happen only if some addresses still on leases file
from the first network (subnet 100.97.97.0/24). In some logs I saw that one
MAC Address still appear on 997 network and got a new address on 998
network. If the first network leases file is clear, the problem doesn't
seem to happen.
How to debug this to find the trigger?
This is a test scenario, but it happened in real server is use. So, I can
do more tests and debugs.
There is no relevant info on /var/log/neutron/dhcp-agent.log (debug ON).
On dnsmasq.log the problems starts
>>> DHCP Client request script
#/sbin/bash
CUSTOMERQTD=200
CUSTOMERCOUNT=1
echo "Logs on /tmp/dhcptest"
mkdir /tmp/dhcptest 2>/dev/null
cd /tmp/dhcptest
while [ $CUSTOMERCOUNT -le $CUSTOMERQTD ]
do
XX=$(printf "%02X\n" $(shuf -i 11-70 -n 1))
sleep 1
dhtest -i em2 -f -m A0:11:$XX:33:44:$XX #-f is broadcast
echo "-----------------------------------------"
CUSTOMERCOUNT=$(echo $(($CUSTOMERCOUNT+1)))
done
>>> DNSMASQ config
/etc/neutron/dnsmasq-neutron.conf
log-queries
log-dhcp #Log de DHCP ?
log-facility=/tmp/dnsmasq.log
dhcp-option-force=26,1500
dhcp-option-force=6,170.231.46.176,8.8.8.8
dhcp-reply-delay=1
dhcp-range=set:PRIV-192.168.0.0-,192.168.0.10,192.168.0.250,86400s
dhcp-option=tag:PRIV-192.168.0.0-,3,192.168.0.1
dhcp-range=set:PRIV-192.168.1.0-,192.168.1.10,192.168.0.250,86400s
dhcp-option=tag:PRIV-192.168.1.0-,3,192.168.1.1
dhcp-range=set:PRIV-10.0.0.0-,10.0.0.10,10.0.0.250,86400s
dhcp-option=tag:PRIV-10.0.0.0-,3,10.0.0.1
dhcp-range=set:PRIV-10.0.1.0-,10.0.1.10,10.0.1.250,86400s
dhcp-option=tag:PRIV-10.0.1.0-,3,10.0.1.1
dhcp-range=set:infra-70-subnet,100.101.1.11,100.101.1.64,600s
dhcp-option=tag:infra-70-subnet,3,100.101.1.1
dhcp-range=set:infra-71-subnet,100.101.2.11,100.101.2.64,600s
dhcp-option=tag:infra-71-subnet,3,100.101.2.1
dhcp-range=set:infra-72-subnet,100.98.98.11,100.98.98.64,600s
dhcp-option=tag:infra-72-subnet,3,100.98.98.1
dhcp-range=set:infra-73-subnet,100.101.4.11,100.101.4.64,600s
dhcp-option=tag:infra-73-subnet,3,100.101.4.1
dhcp-range=set:infra-74-subnet,100.101.5.11,100.101.5.64,600s
dhcp-option=tag:infra-74-subnet,3,100.101.5.1
dhcp-range=set:infra-75-subnet,100.99.99.11,100.99.99.64,600s
dhcp-option=tag:infra-75-subnet,3,100.99.99.1
dhcp-range=set:infra-76-subnet,100.101.7.11,100.101.7.64,600s
dhcp-option=tag:infra-76-subnet,3,100.101.7.1
dhcp-range=set:infra-77-subnet,100.101.8.11,100.101.8.64,600s
dhcp-option=tag:infra-77-subnet,3,100.101.8.1
dhcp-range=set:infra-78-subnet,100.102.1.11,100.102.1.64,600s
dhcp-option=tag:infra-78-subnet,3,100.102.1.1
dhcp-range=set:infra-79-subnet,100.102.2.11,100.102.2.64,600s
dhcp-option=tag:infra-79-subnet,3,100.102.2.1
dhcp-range=set:infra-80-subnet,100.102.3.11,100.102.3.64,600s
dhcp-option=tag:infra-80-subnet,3,100.102.3.1
dhcp-range=set:infra-81-subnet,100.97.97.11,100.97.97.64,600s
dhcp-option=tag:infra-81-subnet,3,100.97.97.1
dhcp-range=set:infra-82-subnet,100.102.5.11,100.102.5.64,600s
dhcp-option=tag:infra-82-subnet,3,100.102.5.1
dhcp-range=set:infra-83-subnet,100.102.6.11,100.102.6.64,600s
dhcp-option=tag:infra-83-subnet,3,100.102.6.1
dhcp-range=set:infra-84-subnet,100.102.7.11,100.102.7.64,600s
dhcp-option=tag:infra-84-subnet,3,100.102.7.1
dhcp-range=set:infra-85-subnet,100.102.8.11,100.102.8.64,600s
dhcp-option=tag:infra-85-subnet,3,100.102.8.1
dhcp-range=set:infra-86-subnet,100.103.1.11,100.103.1.64,600s
dhcp-option=tag:infra-86-subnet,3,100.103.1.1
dhcp-range=set:infra-87-subnet,100.103.2.11,100.103.2.64,600s
dhcp-option=tag:infra-87-subnet,3,100.103.2.1
dhcp-range=set:infra-88-subnet,100.103.3.11,100.103.3.64,600s
dhcp-option=tag:infra-88-subnet,3,100.103.3.1
dhcp-range=set:infra-89-subnet,100.103.4.11,100.103.4.64,600s
dhcp-option=tag:infra-89-subnet,3,100.103.4.1
dhcp-range=set:infra-90-subnet,100.103.5.11,100.103.5.64,600s
dhcp-option=tag:infra-90-subnet,3,100.103.5.1
dhcp-range=set:infra-91-subnet,100.103.6.11,100.103.6.64,600s
dhcp-option=tag:infra-91-subnet,3,100.103.6.1
dhcp-range=set:infra-92-subnet,100.103.7.11,100.103.7.64,600s
dhcp-option=tag:infra-92-subnet,3,100.103.7.1
dhcp-range=set:infra-93-subnet,100.103.8.11,100.103.8.64,600s
dhcp-option=tag:infra-93-subnet,3,100.103.8.1
dhcp-range=set:infra-94-subnet,100.104.1.11,100.104.1.64,600s
dhcp-option=tag:infra-94-subnet,3,100.104.1.1
dhcp-range=set:infra-95-subnet,100.96.96.11,100.96.96.64,600s
dhcp-option=tag:infra-95-subnet,3,100.96.96.1
>>> dnsmasq.log when the first problem happens.
Nov 26 11:12:06 dnsmasq-dhcp[3975]: 1712147283 DHCPDISCOVER(tape56ef56c-66)
a0:11:2f:33:44:2f
Nov 26 11:12:06 dnsmasq-dhcp[3975]: 1712147283 tags: infra-81-subnet,
tape56ef56c-66
Nov 26 11:12:06 dnsmasq-dhcp[3975]: 1712147283 reply delay: 1
Nov 26 11:12:07 dnsmasq-dhcp[3975]: 1712147283 DHCPOFFER(tape56ef56c-66)
100.97.97.13 a0:11:2f:33:44:2f
Nov 26 11:12:07 dnsmasq-dhcp[3975]: Ignoring duplicate dhcp-option 26
Nov 26 11:12:07 dnsmasq-dhcp[3975]: 1712147283 requested options:
1:netmask, 28:broadcast, 3:router, 15:domain-name,
Nov 26 11:12:07 dnsmasq-dhcp[3975]: 1712147283 requested options:
6:dns-server
Nov 26 11:12:07 dnsmasq-dhcp[3975]: 1712147283 next server: 100.97.97.3
Nov 26 11:12:07 dnsmasq-dhcp[3975]: 1712147283 broadcast response
Nov 26 11:12:07 dnsmasq-dhcp[3975]: 1712147283 sent size: 1 option: 53
message-type 2
Nov 26 11:12:07 dnsmasq-dhcp[3975]: 1712147283 sent size: 4 option: 54
server-identifier 100.97.97.3
Nov 26 11:12:07 dnsmasq-dhcp[3975]: 1712147283 sent size: 4 option: 51
lease-time 10m
Nov 26 11:12:07 dnsmasq-dhcp[3975]: 1712147283 sent size: 4 option: 58 T1
5m
Nov 26 11:12:07 dnsmasq-dhcp[3975]: 1712147283 sent size: 4 option: 59 T2
8m45s
Nov 26 11:12:07 dnsmasq-dhcp[3975]: 1712147283 sent size: 4 option: 1
netmask 255.255.255.0
Nov 26 11:12:07 dnsmasq-dhcp[3975]: 1712147283 sent size: 4 option: 28
broadcast 100.97.97.255
Nov 26 11:12:07 dnsmasq-dhcp[3975]: 1712147283 sent size: 14 option: 15
domain-name openstacklocal
Nov 26 11:12:07 dnsmasq-dhcp[3975]: 1712147283 sent size: 4 option: 3
router 100.97.97.1
Nov 26 11:12:07 dnsmasq-dhcp[3975]: 1712147283 sent size: 8 option: 6
dns-server 170.231.46.176, 8.8.8.8
Nov 26 11:12:07 dnsmasq-dhcp[3975]: 1712147283 sent size: 2 option: 26
mtu 1500
Nov 26 11:12:07 dnsmasq-dhcp[3975]: 435880880 available DHCP subnet:
100.97.97.0/255.255.255.0
Nov 26 11:12:07 dnsmasq-dhcp[3975]: 435880880 available DHCP range:
100.101.1.11 -- 100.101.1.64
Nov 26 11:12:07 dnsmasq-dhcp[3975]: 435880880 available DHCP range:
100.101.2.11 -- 100.101.2.64
Nov 26 11:12:07 dnsmasq-dhcp[3975]: 435880880 available DHCP range:
100.98.98.11 -- 100.98.98.64
Nov 26 11:12:07 dnsmasq-dhcp[3975]: 435880880 available DHCP range:
100.101.4.11 -- 100.101.4.64
Nov 26 11:12:07 dnsmasq-dhcp[3975]: 435880880 available DHCP range:
100.101.5.11 -- 100.101.5.64
Nov 26 11:12:07 dnsmasq-dhcp[3975]: 435880880 available DHCP range:
100.99.99.11 -- 100.99.99.64
Nov 26 11:12:07 dnsmasq-dhcp[3975]: 435880880 available DHCP range:
100.101.7.11 -- 100.101.7.64
Nov 26 11:12:07 dnsmasq-dhcp[3975]: 435880880 available DHCP range:
100.101.8.11 -- 100.101.8.64
Nov 26 11:12:07 dnsmasq-dhcp[3975]: 435880880 available DHCP range:
100.102.1.11 -- 100.102.1.64
Nov 26 11:12:07 dnsmasq-dhcp[3975]: 435880880 available DHCP range:
100.102.2.11 -- 100.102.2.64
Nov 26 11:12:07 dnsmasq-dhcp[3975]: 435880880 available DHCP range:
100.102.3.11 -- 100.102.3.64
Nov 26 11:12:07 dnsmasq-dhcp[3975]: 435880880 available DHCP range:
100.97.97.11 -- 100.97.97.64
Nov 26 11:12:07 dnsmasq-dhcp[3975]: 435880880 available DHCP range:
100.102.5.11 -- 100.102.5.64
Nov 26 11:12:07 dnsmasq-dhcp[3975]: 435880880 available DHCP range:
100.102.6.11 -- 100.102.6.64
Nov 26 11:12:07 dnsmasq-dhcp[3975]: 435880880 available DHCP range:
100.102.7.11 -- 100.102.7.64
Nov 26 11:12:07 dnsmasq-dhcp[3975]: 435880880 available DHCP range:
100.102.8.11 -- 100.102.8.64
Nov 26 11:12:07 dnsmasq-dhcp[3975]: 435880880 available DHCP range:
100.103.1.11 -- 100.103.1.64
Nov 26 11:12:07 dnsmasq-dhcp[3975]: 435880880 available DHCP range:
100.103.2.11 -- 100.103.2.64
Nov 26 11:12:07 dnsmasq-dhcp[3975]: 435880880 available DHCP range:
100.103.3.11 -- 100.103.3.64
Nov 26 11:12:07 dnsmasq-dhcp[3975]: 435880880 available DHCP range:
100.103.4.11 -- 100.103.4.64
Nov 26 11:12:07 dnsmasq-dhcp[3975]: 435880880 available DHCP range:
100.103.5.11 -- 100.103.5.64
Nov 26 11:12:07 dnsmasq-dhcp[3975]: 435880880 available DHCP range:
100.103.6.11 -- 100.103.6.64
Nov 26 11:12:07 dnsmasq-dhcp[3975]: 435880880 available DHCP range:
100.103.7.11 -- 100.103.7.64
Nov 26 11:12:07 dnsmasq-dhcp[3975]: 435880880 available DHCP range:
100.103.8.11 -- 100.103.8.64
Nov 26 11:12:07 dnsmasq-dhcp[3975]: 435880880 available DHCP range:
100.104.1.11 -- 100.104.1.64
Nov 26 11:12:07 dnsmasq-dhcp[3975]: 435880880 available DHCP range:
100.96.96.11 -- 100.96.96.64
Nov 26 11:12:10 dnsmasq-dhcp[3975]: 435880880 DHCPDISCOVER(tape56ef56c-66)
a0:11:13:33:44:13
Nov 26 11:12:10 dnsmasq-dhcp[3975]: 435880880 tags: infra-70-subnet,
tape56ef56c-66
Nov 26 11:12:10 dnsmasq-dhcp[3975]: 435880880 reply delay: 1
Nov 26 11:12:10 dnsmasq-dhcp[3975]: 435880880 DHCPOFFER(tape56ef56c-66)
100.101.1.63 a0:11:13:33:44:13
Nov 26 11:12:10 dnsmasq-dhcp[3975]: Ignoring duplicate dhcp-option 26
Nov 26 11:12:10 dnsmasq-dhcp[3975]: 435880880 requested options: 1:netmask,
28:broadcast, 3:router, 15:domain-name,
Nov 26 11:12:10 dnsmasq-dhcp[3975]: 435880880 requested options:
6:dns-server
Nov 26 11:12:10 dnsmasq-dhcp[3975]: 435880880 next server: 100.97.97.3
Nov 26 11:12:10 dnsmasq-dhcp[3975]: 435880880 broadcast response
Nov 26 11:12:10 dnsmasq-dhcp[3975]: 435880880 sent size: 1 option: 53
message-type 2
Nov 26 11:12:10 dnsmasq-dhcp[3975]: 435880880 sent size: 4 option: 54
server-identifier 100.97.97.3
Nov 26 11:12:10 dnsmasq-dhcp[3975]: 435880880 sent size: 4 option: 51
lease-time 10m
Nov 26 11:12:10 dnsmasq-dhcp[3975]: 435880880 sent size: 4 option: 58 T1
5m
Nov 26 11:12:10 dnsmasq-dhcp[3975]: 435880880 sent size: 4 option: 59 T2
8m45s
Nov 26 11:12:10 dnsmasq-dhcp[3975]: 435880880 sent size: 4 option: 1
netmask 255.0.0.0
Nov 26 11:12:10 dnsmasq-dhcp[3975]: 435880880 sent size: 4 option: 28
broadcast 100.97.97.255
Nov 26 11:12:10 dnsmasq-dhcp[3975]: 435880880 sent size: 14 option: 15
domain-name openstacklocal
Nov 26 11:12:10 dnsmasq-dhcp[3975]: 435880880 sent size: 4 option: 3
router 100.101.1.1
Nov 26 11:12:10 dnsmasq-dhcp[3975]: 435880880 sent size: 8 option: 6
dns-server 170.231.46.176, 8.8.8.8
Nov 26 11:12:10 dnsmasq-dhcp[3975]: 435880880 sent size: 2 option: 26 mtu
1500
Nov 26 11:12:10 dnsmasq-dhcp[3975]: 1712147283 available DHCP subnet:
100.97.97.0/255.255.255.0
Nov 26 11:12:10 dnsmasq-dhcp[3975]: 1712147283 available DHCP range:
100.101.1.11 -- 100.101.1.64
Nov 26 11:12:10 dnsmasq-dhcp[3975]: 1712147283 available DHCP range:
100.101.2.11 -- 100.101.2.64
Nov 26 11:12:10 dnsmasq-dhcp[3975]: 1712147283 available DHCP range:
100.98.98.11 -- 100.98.98.64
Nov 26 11:12:10 dnsmasq-dhcp[3975]: 1712147283 available DHCP range:
100.101.4.11 -- 100.101.4.64
Nov 26 11:12:10 dnsmasq-dhcp[3975]: 1712147283 available DHCP range:
100.101.5.11 -- 100.101.5.64
Nov 26 11:12:10 dnsmasq-dhcp[3975]: 1712147283 available DHCP range:
100.99.99.11 -- 100.99.99.64
Nov 26 11:12:10 dnsmasq-dhcp[3975]: 1712147283 available DHCP range:
100.101.7.11 -- 100.101.7.64
Nov 26 11:12:10 dnsmasq-dhcp[3975]: 1712147283 available DHCP range:
100.101.8.11 -- 100.101.8.64
Nov 26 11:12:10 dnsmasq-dhcp[3975]: 1712147283 available DHCP range:
100.102.1.11 -- 100.102.1.64
Nov 26 11:12:10 dnsmasq-dhcp[3975]: 1712147283 available DHCP range:
100.102.2.11 -- 100.102.2.64
Thanks any help
--
Luis Kleber
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