dnsmasq + dhcp

cbrace

cbrace

Hi all,

Is there some special voodoo necessary to get dns/dnsmasq working as a dhcp server?

On my LAN server/gateway running FreeBSD v8.2, it works fine as a DNS server, but I would like to use it for DHCP as well and retire net/isc-dhcp42-server, but I can't get it working; it starts fine, but LAN clients can't get leases.

THis part of the dnsmasq faq seems relevant:
Q: This new DHCP server is well and good, but it doesn't work for me.
What's the problem?

A: There are a couple of configuration gotchas which have been
encountered by people moving from the ISC dhcpd to the dnsmasq
integrated DHCP daemon. Both are related to differences in
in the way the two daemons bypass the IP stack to do "ground up"
IP configuration and can lead to the dnsmasq daemon failing
whilst the ISC one works.

The first thing to check is the broadcast address set for the
ethernet interface. This is normally the adddress on the connected
network with all ones in the host part. For instance if the
address of the ethernet interface is 192.168.55.7 and the netmask
is 255.255.255.0 then the broadcast address should be
192.168.55.255. Having a broadcast address which is not on the
network to which the interface is connected kills things stone
dead.

The second potential problem relates to firewall rules: since the ISC
daemon in some configurations bypasses the kernel firewall rules
entirely, the ability to run the ISC daemon does not indicate
that the current configuration is OK for the dnsmasq daemon.
For the dnsmasq daemon to operate it's vital that UDP packets to
and from ports 67 and 68 and broadcast packets with source
address 0.0.0.0 and destination address 255.255.255.255 are not
dropped by iptables/ipchains
Click to expand...
I've checked the broadcast address (looks right) and port 67 UDP is definitely open on the LAN. But no luck.

Any ideas?
 
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