[Dnsmasq-discuss] Different IP address for a single MAC address

Tsachi tsachi.kimel at gmail.com
Thu Apr 11 13:16:04 BST 2013


Hey,

I am working with ver 2.61

I came across a dnsmasq.leases file which consists of the following 3 lines:

605245 10:0b:a9:ad:bc:58 10.0.0.13 pc
01:52:41:53:20:10:0b:a9:ad:bc:58:00:00:00:00:00:00

605245 10:0b:a9:ad:bc:58 10.0.0.12 *
01:52:41:53:20:10:0b:a9:ad:bc:58:00:00:01:00:00:00

605231 10:0b:a9:ad:bc:58 10.0.0.11 * 01:10:0b:a9:ad:bc:58

This indicate that the same MAC (different Client-ID) received 3 different
IP address 10.0.0.11/12/13.

I don't have an access to the HOST computer (WIFI), and I was not able to
capture the DHCP packets, but the logs shows that

they were sent at around the same time (seconds difference).



Any idea how-come an host sends 3 different Client IDs ?

Is it suppose to be that dnsmasq gives different IPs to the same MAC ?



Log:
Dec 31 17:07:11 ALT3100 daemon.info dnsmasq-dhcp[183]: DHCPINFORM(br0)
10.2.181.96 10:0b:a9:ad:bc:58
Dec 31 17:07:11 ALT3100 daemon.info dnsmasq-dhcp[183]: DHCPACK(br0)
10.2.181.96 10:0b:a9:ad:bc:58 pc
Dec 31 17:07:11 ALT3100 daemon.info dnsmasq-dhcp[183]: DHCPREQUEST(br0)
10.2.181.96 10:0b:a9:ad:bc:58
Dec 31 17:07:11 ALT3100 daemon.info dnsmasq-dhcp[183]: DHCPNAK(br0)
10.2.181.96 10:0b:a9:ad:bc:58 wrong network
Dec 31 17:07:11 ALT3100 daemon.info dnsmasq-dhcp[183]: DHCPDISCOVER(br0)
10:0b:a9:ad:bc:58
Dec 31 17:07:11 ALT3100 daemon.info dnsmasq-dhcp[183]: DHCPOFFER(br0)
10.0.0.11 10:0b:a9:ad:bc:58
Dec 31 17:07:11 ALT3100 daemon.info dnsmasq-dhcp[183]: DHCPREQUEST(br0)
10.0.0.11 10:0b:a9:ad:bc:58
Dec 31 17:07:11 ALT3100 daemon.info dnsmasq-dhcp[183]: DHCPACK(br0)
10.0.0.11 10:0b:a9:ad:bc:58 pc
Dec 31 17:07:14 ALT3100 daemon.info dnsmasq-dhcp[183]: DHCPINFORM(br0)
10.0.0.11 10:0b:a9:ad:bc:58
Dec 31 17:07:14 ALT3100 daemon.info dnsmasq-dhcp[183]: DHCPACK(br0)
10.0.0.11 10:0b:a9:ad:bc:58 pc
Dec 31 17:07:25 ALT3100 daemon.info dnsmasq-dhcp[183]: DHCPDISCOVER(br0)
10:0b:a9:ad:bc:58
Dec 31 17:07:25 ALT3100 daemon.info dnsmasq-dhcp[183]: DHCPOFFER(br0)
10.0.0.12 10:0b:a9:ad:bc:58
Dec 31 17:07:25 ALT3100 daemon.info dnsmasq-dhcp[183]: DHCPREQUEST(br0)
10.0.0.12 10:0b:a9:ad:bc:58
Dec 31 17:07:25 ALT3100 daemon.info dnsmasq-dhcp[183]: DHCPACK(br0)
10.0.0.12 10:0b:a9:ad:bc:58 pc
Dec 31 17:07:25 ALT3100 daemon.info dnsmasq-dhcp[183]: DHCPDISCOVER(br0)
10:0b:a9:ad:bc:58
Dec 31 17:07:25 ALT3100 daemon.info dnsmasq-dhcp[183]: DHCPOFFER(br0)
10.0.0.13 10:0b:a9:ad:bc:58
Dec 31 17:07:25 ALT3100 daemon.info dnsmasq-dhcp[183]: DHCPREQUEST(br0)
10.0.0.13 10:0b:a9:ad:bc:58
Dec 31 17:07:25 ALT3100 daemon.info dnsmasq-dhcp[183]: DHCPACK(br0)
10.0.0.13 10:0b:a9:ad:bc:58 pc



Thanks,

Tsachi
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