[B.A.T.M.A.N.] batman-adv gw_mode and ipv6 router advertisements

[B.A.T.M.A.N.] batman-adv gw_mode and ipv6 router advertisements

[Guido Iribarren]

Hello everyone,
in the deploy of DeltaLibre (a local WCN very similar to EigenNet
(part of ninux) in Italy) i'm facing a dilemma:
i'm currently using batman-adv gw_mode client in all nodes, and the
ones that connect directly to internet through an ISP have gw_mode =
server
This way, clients have their DHCP requests transparently unicasted to
the 'best' gateway, and get a corresponding IPv4 and default gw.
Which is great.

But in IPv6 there's no equivalent functionality. If two routers on the
same broadcast domain (batman-adv cloud) run radvd and announce two
different prefixes, all hosts on the network autoconfigure 2 ips, one
in each prefix. Then, AFAIU, it's up to the client to choose between
the announced gateways, to send the traffic.

Are there any plans of implementing in batman-adv something analog to
the mangling done on DHCPv4 packets, to RA packets as well? (the
mechanism would be the inverse: instead of unicasting queries and
replies, propagate to clients only 1 RA packet out of all incoming;
decide which one to propagate based on gw_mode current logic)

Or, at least, extend the current mangling done in DHCPv4 packets to
DHCPv6 packets as well?

I would *love* to simply show some code instead of asking 'wishlist'
questions, but sadly i'm not a programmer :(

Thanks a lot,

Guido

pd. I'm pretty new to ipv6, so It's possible that i'm overlooking
'obvious' concepts in my questions: in that case you can politely tell
me to RTFM :)

Re: [B.A.T.M.A.N.] batman-adv gw_mode and ipv6 router advertisements

[Antonio Quartulli]

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Hello Guido,

On Sun, Jun 10, 2012 at 08:14:27PM -0300, Guido Iribarren wrote:
> Hello everyone,
> in the deploy of DeltaLibre (a local WCN very similar to EigenNet
> (part of ninux) in Italy) i'm facing a dilemma:
> i'm currently using batman-adv gw_mode client in all nodes, and the
> ones that connect directly to internet through an ISP have gw_mode =
> server
> This way, clients have their DHCP requests transparently unicasted to
> the 'best' gateway, and get a corresponding IPv4 and default gw.
> Which is great.

correct.

> 
> But in IPv6 there's no equivalent functionality. If two routers on the
> same broadcast domain (batman-adv cloud) run radvd and announce two
> different prefixes, all hosts on the network autoconfigure 2 ips, one
> in each prefix. Then, AFAIU, it's up to the client to choose between
> the announced gateways, to send the traffic.
> 

yes. batman-adv does treat RA packets as normal broadcasts. They are neither
filtered nor handled in any particular way.

> Are there any plans of implementing in batman-adv something analog to
> the mangling done on DHCPv4 packets, to RA packets as well? (the
> mechanism would be the inverse: instead of unicasting queries and
> replies, propagate to clients only 1 RA packet out of all incoming;
> decide which one to propagate based on gw_mode current logic)
> 

someone proposed the idea on the bugtraq, but no plans about implementation have
been seen so far..

> Or, at least, extend the current mangling done in DHCPv4 packets to
> DHCPv6 packets as well?
> 

this is already implemented. Gw_mode supports snooping of both dhcpv4 and
dhcpv6 packets. So you could use dhcpv6 instead of radvd (at least for now).

> I would *love* to simply show some code instead of asking 'wishlist'
> questions, but sadly i'm not a programmer :(

you are contributing anyway :-)

Cheers,

-- 
Antonio Quartulli

..each of us alone is worth nothing..
Ernesto "Che" Guevara

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Re: [B.A.T.M.A.N.] batman-adv gw_mode and ipv6 router advertisements

[Marek Lindner]

On Monday, June 11, 2012 07:14:27 Guido Iribarren wrote:
> Are there any plans of implementing in batman-adv something analog to
> the mangling done on DHCPv4 packets, to RA packets as well? (the
> mechanism would be the inverse: instead of unicasting queries and
> replies, propagate to clients only 1 RA packet out of all incoming;
> decide which one to propagate based on gw_mode current logic)
> 
> Or, at least, extend the current mangling done in DHCPv4 packets to
> DHCPv6 packets as well?

What makes you think DHCPv6 is not working ? It should ...

Regards,
Marek

Re: [B.A.T.M.A.N.] batman-adv gw_mode and ipv6 router advertisements

[Guido Iribarren]

On Sun, Jun 10, 2012 at 8:29 PM, Marek Lindner <lindner_marek@yahoo.de> wrote:
> On Monday, June 11, 2012 07:14:27 Guido Iribarren wrote:
>> Or, at least, extend the current mangling done in DHCPv4 packets to
>> DHCPv6 packets as well?
>
> What makes you think DHCPv6 is not working ? It should ...

Nothing but my own unfounded prejudice...
loving batman-adv every day a bit more!

one of these days i'm going to try "batctl solve life"

cheers!

Re: [B.A.T.M.A.N.] batman-adv gw_mode and ipv6 router advertisements

[Sven Eckelmann]

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On Monday 11 June 2012 01:23:00 Antonio Quartulli wrote:
> > Are there any plans of implementing in batman-adv something analog to
> > the mangling done on DHCPv4 packets, to RA packets as well? (the
> > mechanism would be the inverse: instead of unicasting queries and
> > replies, propagate to clients only 1 RA packet out of all incoming;
> > decide which one to propagate based on gw_mode current logic)
> 
> someone proposed the idea on the bugtraq, but no plans about implementation
> have been seen so far..

Just for completeness: http://www.open-mesh.org/issues/159

Kind regards,
	Sven

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