[Dnsmasq-discuss] IPv6 RA issues when bound to IPv4

Michal Zatloukal myxal.mxl at gmail.com
Fri Jul 17 13:01:04 BST 2015


I'm not sure what you mean - what exactly should I have in the configuration?
Is there a way to check, if the correct multicast address is being
bound to? netstat -tupan doesn't show any multicast addresses.

MZ

On 16 July 2015 at 19:49, Simon Kelley <simon at thekelleys.org.uk> wrote:
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> Dnsmasq needs to advertise the global address, I think. Receiving RAs
> shouldn't be a problem, dnsmasq binds the correct multicast address.
>
> Cheers,
>
> Simon.
>
>
> On 16/07/15 16:27, Michal Zatloukal wrote:
>> Hi all,
>>
>> I'm using dnsmasq (2.68-1ubuntu0.1) on a machine where the need to
>> run tftpd-hpa along with dnsmasq's own tftp server has arisen (both
>> on just IPv4). I decided to use the "secondary IP address" feature
>> in Linux networking system to bind tftpd-hpa to the secondary IP
>> address, and set up dnsmasq to bind the following: - primary IPv4
>> address - localhost IPv4 - For IPv6, I put in localhost, global and
>> link-local addresses. IIUC, RA can't work in this config, since the
>> destination on RS is multicast ff02::2 and therefore aren't
>> delivered to any of the sockets opened by dnsmasq.
>>
>> Now, which IPv6 address do I enter so that IPv6 router
>> announcements work correctly? (Is it even possible?) - adding
>> ff02::2 doesn't work, dnsmasq reports error in syslog - cannot bind
>> to this address. - replacing all IPv6 addresses with "::" allows
>> dnsmasq to start and bind to wildcard IPv6, but it seems incoming
>> RS packets are ignored - nothing appears in syslog when clients
>> send solicitation. Is the filtering code in DSNmasq perhaps not
>> expecting a wildcard address in the listen-address parameter and
>> filters packets against it?
>>
>> Regards,
>>
>> MZ
>>
>> _______________________________________________ Dnsmasq-discuss
>> mailing list Dnsmasq-discuss at lists.thekelleys.org.uk
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>>
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