[Dnsmasq-discuss] Duplicate IPs assigned to devices with similar MAC (same vendor)

Oleg Brodkin oleg at kumunetworks.com
Sat Jan 14 16:28:23 GMT 2017


# dnsmasq --version
Dnsmasq version 2.76  Copyright (c) 2000-2016 Simon Kelley
# Lease time 48 hours

DNSMASQ server has been in our office for last 4-5 years, and mostly no
issues with assigning IPs. Except there are two recent devices in our lab
from the same vendor, and the server dishes them out duplicate IPs. Any
ideas on what is going on and how to fix it? Thank you

Oleg

-- DEVICE 1
Jan 13 17:33:23 dnsmasq-dhcp[12864]: 328676717 sent size:  4 option: 54
server-identifier  10.111.222.6
Jan 13 17:33:23 dnsmasq-dhcp[12864]: 328676717 sent size:  4 option:  1
netmask  255.255.248.0
Jan 13 17:33:23 dnsmasq-dhcp[12864]: 328676717 sent size:  4 option: 28
broadcast  10.111.223.255
Jan 13 17:33:23 dnsmasq-dhcp[12864]: 328676717 sent size: 16 option: 15
domain-name  xxx.com
Jan 13 17:33:23 dnsmasq-dhcp[12864]: 328676717 sent size:  4 option:  6
dns-server  10.111.222.6
Jan 13 17:33:23 dnsmasq-dhcp[12864]: 328676717 sent size:  4 option:  3
router  10.111.222.1
Jan 13 17:33:35 dnsmasq-dhcp[12864]: 792419227 available DHCP range:
10.111.216.10 -- 10.111.219.250
Jan 13 17:33:35 dnsmasq-dhcp[12864]: 792419227 client provides name: g5br2d2
Jan 13 17:33:35 dnsmasq-dhcp[12864]: 792419227 DHCPDISCOVER(eth0)
f4:4d:30:60:73:40
Jan 13 17:33:35 dnsmasq-dhcp[12864]: 792419227 tags: eth0
Jan 13 17:33:35 dnsmasq-dhcp[12864]: 792419227 DHCPOFFER(eth0)
10.111.218.130 f4:4d:30:60:73:40
Jan 13 17:33:35 dnsmasq-dhcp[12864]: 792419227 requested options:
1:netmask, 3:router, 12:hostname, 15:domain-name,
Jan 13 17:33:35 dnsmasq-dhcp[12864]: 792419227 requested options:
6:dns-server, 33:static-route, 121:classless-static-route,
Jan 13 17:33:35 dnsmasq-dhcp[12864]: 792419227 requested options:
42:ntp-server, 101
Jan 13 17:33:35 dnsmasq-dhcp[12864]: 792419227 next server: 10.111.222.6
Jan 13 17:33:35 dnsmasq-dhcp[12864]: 792419227 sent size:  1 option: 53
message-type  2
Jan 13 17:33:35 dnsmasq-dhcp[12864]: 792419227 sent size:  4 option: 54
server-identifier  10.111.222.6
Jan 13 17:33:35 dnsmasq-dhcp[12864]: 792419227 sent size:  4 option: 51
lease-time  2d
Jan 13 17:33:35 dnsmasq-dhcp[12864]: 792419227 sent size:  4 option: 58 T1
 1d
--
Jan 13 17:33:35 dnsmasq-dhcp[12864]: 792419227 sent size:  4 option:  1
netmask  255.255.248.0
Jan 13 17:33:35 dnsmasq-dhcp[12864]: 792419227 sent size:  4 option: 28
broadcast  10.111.223.255
Jan 13 17:33:35 dnsmasq-dhcp[12864]: 792419227 sent size: 16 option: 15
domain-name  xxx.com
Jan 13 17:33:35 dnsmasq-dhcp[12864]: 792419227 sent size:  8 option: 42
ntp-server  10.111.222.18, 10.111.222.22
Jan 13 17:33:35 dnsmasq-dhcp[12864]: 792419227 sent size:  4 option:  6
dns-server  10.111.222.6
Jan 13 17:33:35 dnsmasq-dhcp[12864]: 792419227 sent size:  4 option:  3
router  10.111.222.1
Jan 13 17:33:35 dnsmasq-dhcp[12864]: 792419227 available DHCP range:
10.111.216.10 -- 10.111.219.250
Jan 13 17:33:35 dnsmasq-dhcp[12864]: 792419227 client provides name: g5br2d2
Jan 13 17:33:35 dnsmasq-dhcp[12864]: 792419227 DHCPREQUEST(eth0)
10.111.218.130 f4:4d:30:60:73:40
Jan 13 17:33:35 dnsmasq-dhcp[12864]: 792419227 tags: eth0
Jan 13 17:33:35 dnsmasq-dhcp[12864]: 792419227 DHCPACK(eth0) 10.111.218.130
f4:4d:30:60:73:40 g5br2d2
Jan 13 17:33:35 dnsmasq-dhcp[12864]: 792419227 requested options:
1:netmask, 3:router, 12:hostname, 15:domain-name,
Jan 13 17:33:35 dnsmasq-dhcp[12864]: 792419227 requested options:
6:dns-server, 33:static-route, 121:classless-static-route,
Jan 13 17:33:35 dnsmasq-dhcp[12864]: 792419227 requested options:
42:ntp-server, 101
Jan 13 17:33:35 dnsmasq-dhcp[12864]: 792419227 next server: 10.111.222.6
Jan 13 17:33:35 dnsmasq-dhcp[12864]: 792419227 sent size:  1 option: 53
message-type  5
Jan 13 17:33:35 dnsmasq-dhcp[12864]: 792419227 sent size:  4 option: 54
server-identifier  10.111.222.6
Jan 13 17:33:35 dnsmasq-dhcp[12864]: 792419227 sent size:  4 option: 51
lease-time  2d
Jan 13 17:33:35 dnsmasq-dhcp[12864]: 792419227 sent size:  4 option: 58 T1
 1d


-- DEVICE 2
Jan 13 14:12:23 dnsmasq-dhcp[12619]: 457454147 sent size:  4 option: 54
server-identifier  10.111.222.6
Jan 13 14:12:23 dnsmasq-dhcp[12619]: 457454147 sent size:  4 option:  1
netmask  255.255.248.0
Jan 13 14:12:23 dnsmasq-dhcp[12619]: 457454147 sent size:  4 option: 28
broadcast  10.111.223.255
Jan 13 14:12:23 dnsmasq-dhcp[12619]: 457454147 sent size: 16 option: 15
domain-name  xxx.com
Jan 13 14:12:23 dnsmasq-dhcp[12619]: 457454147 sent size:  4 option:  6
dns-server  10.111.222.6
Jan 13 14:12:23 dnsmasq-dhcp[12619]: 457454147 sent size:  4 option:  3
router  10.111.222.1
Jan 13 14:12:31 dnsmasq-dhcp[12619]: 341215309 available DHCP range:
10.111.216.10 -- 10.111.219.250
Jan 13 14:12:31 dnsmasq-dhcp[12619]: 341215309 client provides name:
nuc_labtest_1
Jan 13 14:12:31 dnsmasq-dhcp[12619]: 341215309 DHCPDISCOVER(eth0)
f4:4d:30:60:90:8d
Jan 13 14:12:31 dnsmasq-dhcp[12619]: 341215309 tags: eth0
Jan 13 14:12:31 dnsmasq-dhcp[12619]: 341215309 DHCPOFFER(eth0)
10.111.218.130 f4:4d:30:60:90:8d
Jan 13 14:12:31 dnsmasq-dhcp[12619]: 341215309 requested options:
1:netmask, 3:router, 12:hostname, 15:domain-name,
Jan 13 14:12:31 dnsmasq-dhcp[12619]: 341215309 requested options:
6:dns-server, 33:static-route, 121:classless-static-route,
Jan 13 14:12:31 dnsmasq-dhcp[12619]: 341215309 requested options:
42:ntp-server, 101
Jan 13 14:12:31 dnsmasq-dhcp[12619]: 341215309 next server: 10.111.222.6
Jan 13 14:12:31 dnsmasq-dhcp[12619]: 341215309 sent size:  1 option: 53
message-type  2
Jan 13 14:12:31 dnsmasq-dhcp[12619]: 341215309 sent size:  4 option: 54
server-identifier  10.111.222.6
Jan 13 14:12:31 dnsmasq-dhcp[12619]: 341215309 sent size:  4 option: 51
lease-time  2d
Jan 13 14:12:31 dnsmasq-dhcp[12619]: 341215309 sent size:  4 option: 58 T1
 1d
--
Jan 13 14:12:31 dnsmasq-dhcp[12619]: 341215309 sent size:  4 option:  1
netmask  255.255.248.0
Jan 13 14:12:31 dnsmasq-dhcp[12619]: 341215309 sent size:  4 option: 28
broadcast  10.111.223.255
Jan 13 14:12:31 dnsmasq-dhcp[12619]: 341215309 sent size: 16 option: 15
domain-name  xxx.com
Jan 13 14:12:31 dnsmasq-dhcp[12619]: 341215309 sent size:  8 option: 42
ntp-server  10.111.222.18, 10.111.222.22
Jan 13 14:12:31 dnsmasq-dhcp[12619]: 341215309 sent size:  4 option:  6
dns-server  10.111.222.6
Jan 13 14:12:31 dnsmasq-dhcp[12619]: 341215309 sent size:  4 option:  3
router  10.111.222.1
Jan 13 14:12:31 dnsmasq-dhcp[12619]: 341215309 available DHCP range:
10.111.216.10 -- 10.111.219.250
Jan 13 14:12:31 dnsmasq-dhcp[12619]: 341215309 client provides name:
nuc_labtest_1
Jan 13 14:12:31 dnsmasq-dhcp[12619]: 341215309 DHCPREQUEST(eth0)
10.111.218.130 f4:4d:30:60:90:8d
Jan 13 14:12:31 dnsmasq-dhcp[12619]: 341215309 tags: eth0
Jan 13 14:12:31 dnsmasq-dhcp[12619]: 341215309 DHCPACK(eth0) 10.111.218.130
f4:4d:30:60:90:8d nuc_labtest_1
Jan 13 14:12:31 dnsmasq-dhcp[12619]: 341215309 requested options:
1:netmask, 3:router, 12:hostname, 15:domain-name,
Jan 13 14:12:31 dnsmasq-dhcp[12619]: 341215309 requested options:
6:dns-server, 33:static-route, 121:classless-static-route,
Jan 13 14:12:31 dnsmasq-dhcp[12619]: 341215309 requested options:
42:ntp-server, 101
Jan 13 14:12:31 dnsmasq-dhcp[12619]: 341215309 next server: 10.111.222.6
Jan 13 14:12:31 dnsmasq-dhcp[12619]: 341215309 sent size:  1 option: 53
message-type  5
Jan 13 14:12:31 dnsmasq-dhcp[12619]: 341215309 sent size:  4 option: 54
server-identifier  10.111.222.6
Jan 13 14:12:31 dnsmasq-dhcp[12619]: 341215309 sent size:  4 option: 51
lease-time  2d
Jan 13 14:12:31 dnsmasq-dhcp[12619]: 341215309 sent size:  4 option: 58 T1
 1d
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