[Dnsmasq-discuss] Sometimes forgets to hand out known dhcp-host IP

[hansen]

Hi dnsmasq'ueraders :)

I have a small network, where I am trying to split my network into to
ranges.
One range for local machines and another range for guests. On two different
interfaces connected to dnsmasq.

Usually I don't have any problems, but sometimes my local machines end up
on the guest range network.
If I release the DHCP on the machine and reboot it, then it is 50/50 if the
go back to local network or end up on guest network again.

Is this network setup just bad and not possible to behave as I expect - or
is it just a configuration mistake?
I am running dnsmasq 2.65 on FreeBSD 7.4.
Looking at the changelog it seems like the feature I'm looking for was
removed in 2.63 (Remove the interface:<interface> argument in --dhcp-range)

Any hints are more than welcome! Thank you in advance,
-hansen

Here is how it looks, when it gives the wrong IP:
08:23:42 dnsmasq-dhcp[68210]: DHCPREQUEST(em1) 192.168.2.107
50:e5:49:d1:7b:82
08:23:42 dnsmasq-dhcp[68210]: DHCPNAK(em1) 192.168.2.107 50:e5:49:d1:7b:82
wrong network
08:23:42 dnsmasq-dhcp[68210]: DHCPREQUEST(em2) 192.168.2.107
50:e5:49:d1:7b:82
08:23:42 dnsmasq-dhcp[68210]: DHCPACK(em2) 192.168.2.107 50:e5:49:d1:7b:82
PC07
08:23:46 dnsmasq-dhcp[68210]: DHCPDISCOVER(em1) 50:e5:49:d1:7b:82
08:23:46 dnsmasq-dhcp[68210]: DHCPOFFER(em1) 10.10.10.17 50:e5:49:d1:7b:82
08:23:46 dnsmasq-dhcp[68210]: DHCPDISCOVER(em2) 50:e5:49:d1:7b:82
08:23:46 dnsmasq-dhcp[68210]: DHCPOFFER(em2) 192.168.2.107 50:e5:49:d1:7b:82
08:23:46 dnsmasq-dhcp[68210]: DHCPREQUEST(em1) 10.10.10.17 50:e5:49:d1:7b:82
08:23:46 dnsmasq-dhcp[68210]: DHCPACK(em1) 10.10.10.17 50:e5:49:d1:7b:82
PC07
08:23:46 dnsmasq-dhcp[68210]: not giving name PC07 to the DHCP lease of
10.10.10.17 because the name exists in /etc/hosts with address 192.168.2.107
08:23:46 dnsmasq-dhcp[68210]: DHCPREQUEST(em2) 10.10.10.17 50:e5:49:d1:7b:82
08:23:46 dnsmasq-dhcp[68210]: DHCPNAK(em2) 10.10.10.17 50:e5:49:d1:7b:82
wrong server-ID
08:23:55 dnsmasq-dhcp[68210]: DHCPINFORM(em2) 10.10.10.17 50:e5:49:d1:7b:82
ignored
08:23:55 dnsmasq-dhcp[68210]: DHCPINFORM(em1) 10.10.10.17 50:e5:49:d1:7b:82
08:23:55 dnsmasq-dhcp[68210]: DHCPACK(em1) 10.10.10.17 50:e5:49:d1:7b:82
PC07

Here is the normal way, when it gives the correct IP:
08:44:55 dnsmasq-dhcp[68210]: DHCPREQUEST(em2) 192.168.2.106
00:19:b9:26:83:8b
08:44:55 dnsmasq-dhcp[68210]: DHCPACK(em2) 192.168.2.106 00:19:b9:26:83:8b
PC06
08:44:55 dnsmasq-dhcp[68210]: DHCPREQUEST(em1) 192.168.2.106
00:19:b9:26:83:8b
08:44:55 dnsmasq-dhcp[68210]: DHCPNAK(em1) 192.168.2.106 00:19:b9:26:83:8b
wrong network
08:44:59 dnsmasq-dhcp[68210]: DHCPINFORM(em2) 192.168.2.106
00:19:b9:26:83:8b
08:44:59 dnsmasq-dhcp[68210]: DHCPACK(em2) 192.168.2.106 00:19:b9:26:83:8b
PC06
08:44:59 dnsmasq-dhcp[68210]: DHCPINFORM(em1) 192.168.2.106
00:19:b9:26:83:8b
08:44:59 dnsmasq-dhcp[68210]: DHCPACK(em1) 192.168.2.106 00:19:b9:26:83:8b
PC06

The constant difference between correct and wrong DHCP'ing is the first
interface to get a DHCPREQUEST.
When it fails, it's always because em1 is called first.

#=============dnsmasq.conf:START
domain-needed
bogus-priv
no-resolv
no-poll
expand-hosts

server=8.8.8.8
server=8.8.4.4
interface=em2
interface=em1

dhcp-range=tag:em2,set:localpc,192.168.2.0,static,infinite
dhcp-range=tag:em1,tag:!localpc,10.10.10.10,10.10.10.99,1h

dhcp-host=00:19:B9:26:2f:a6,192.168.2.101,PC01,infinite
dhcp-host=00:19:B9:26:87:35,192.168.2.102,PC02,infinite
dhcp-host=00:19:B9:26:83:af,192.168.2.103,PC03,infinite
dhcp-host=00:19:B9:26:8b:12,192.168.2.104,PC04,infinite
dhcp-host=00:19:B9:26:85:55,192.168.2.105,PC05,infinite
dhcp-host=00:19:B9:26:83:8b,192.168.2.106,PC06,infinite
dhcp-host=50:e5:49:d1:7b:82,192.168.2.107,PC07,infinite

dhcp-ignore=tag:localpc,tag:known,tag:em2

dhcp-option=tag:em2,19,0
dhcp-option=42,0.0.0.0
dhcp-option=tag:em2,44,0.0.0.0
dhcp-option=tag:em2,45,0.0.0.0
dhcp-option=tag:em2,46,8
dhcp-option=tag:em2,47

dhcp-lease-max=200
dhcp-authoritative
cache-size=500
no-negcache
#=============dnsmasq.conf:END
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