[Dnsmasq-discuss] Problems With Windows Vista

[Jeremy M]

You were exactly right.  The firewall was blocking outbound broadcast
packets on the subnet.  I'm not sure if this is correct, but my config
specifies:


dhcp-range=wireless,192.168.3.50,192.168.3.250,255.255.255.0,192.168.3.255,12h

I think that's saying the broadcast address should be 192.168.3.255, but
broadcasts attempts are actually going out on 255.255.255.255.


Thank you,

Jeremy


On Sat, Jan 23, 2010 at 5:18 AM, Simon Kelley <simon at thekelleys.org.uk>wrote:

> Jeremy M wrote:
>
>> I've tried everything on this one, but can't figure out what's going on.
>>  I have a router with 4 internal network interfaces with 4 instances of
>> Dnsmasq 2.51 running independently on each one.  All systems on the network
>> get DHCP responses without problems, except for machines running Windows
>> Vista.  When running from the router, Vista will simply not accept the DHCP
>> response even though requests are all being logged correctly.  I've tried
>> connecting over wired, wireless (through a WAP) and different network
>> segments/interfaces, but Vista will not accept a response from anywhere.
>>
>> For wireless, I'm running DD-WRT (http://www.dd-wrt.com/site/index) in
>> wireless access point (WAP) mode, so having exhausted everything else, I
>> tried enabling Dnsmasq (running version 2.45) on the WAP as a last resort
>> and for some reason, that works fine with Vista.  I tried copying the config
>> exactly as on the router (with some interface tweaks), but it won't work.
>>  I'm still running DHCP off the WAP just for Vista, but would prefer to run
>> on the router to centralize services and keep access logs.
>>
>> I've gone as far as running a packet sniffer on the router, and it appears
>> to be sending responses, but for some reason, Vista just won't accept them.
>>
>> Any thoughts or suggestions on why Vista won't accept responses from one
>> running instance of Dnsmasq (running on router), but will from another
>> (running on WAP)?
>>
>>
>> Regards,
>>
>> Jeremy M.
>>
>>
> Well, I guess the obvious question is "are there any differences between
> the responses from dnsmasq 2.45 and dnsmasq 2.51" Wireshark works really
> well at decoding these things, but if you're not confident at interpreting
> what it tells you, feel free to send me packet captures off-list.
>
> One thing to consider is that vista (unlike almost all other DHCP clients)
> demands that the DHCP server sends back all responses as broadcasts.
> Inappropriate firewall rules on the system running dnsmasq 2.51 which block
> these broadcasts would give exactly the symptoms you are seeing.
>
> Simon.
>
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