Multiple gateways support

[K. Macy]

Uhm  ... what was the intended content of your message?

And ... the RADIX_MPATH code is now considerably more flexible than just ECMP.


-Kip

On Wed, Apr 6, 2011 at 8:10 PM, J. Hellenthal <jhell at dataix.net> wrote:
> Hmmm funny, seems the mailing list is now stripping my address and
> moving posts to the top.
>
> On Wed, Apr 06, 2011 at 06:15:19PM +0200, K. Macy wrote:
>> The weights of the links can be changed at run time. If one link is
>> not passing traffic its weight should be set to zero until such time
>> as it is passing traffic again.
>>
>> On Wed, Apr 6, 2011 at 6:13 PM, Nikolay Denev <ndenev at gmail.com> wrote:
>> > On Apr 6, 2011, at 5:36 PM, Michael Proto wrote:
>> >
>> >> On Wed, Apr 6, 2011 at 8:02 AM, J. Hellenthal <jhell at dataix.net> wrote:
>> >>> On Wed, Apr 06, 2011 at 01:45:54PM +0400, Eir Nym wrote:
>> >>>> On 1 April 2011 21:27, Baginski Darren <kickbsd at yandex.ru> wrote:
>> >>>>> Hi!
>> >>>>>
>> >>>>> Could please someone tell me about current state of multiple gw capabilities of FreeBSD?
>> >>>>> I have dual homed FreeBSD box, one interface ISP1 another ISP2 :
>> >>>>> 1) can I balance outgoing traffic across them ?
>> >>>>> 2) Is there support of any kind dead gateway detection?
>> >>>>> 3) Can I install multiple routes to the same network (with same and with different wight)? If yes how it behaves with one link failure, in particular if interface is down?
>> >>>>>
>> >>>
>> >>> From what you said here it seems that your looking for lagg(4) with
>> >>> configured with the loadbalance option. Give this man page [1] a
>> >>> thorough read and youll probably see what your looking for.
>> >>>
>> >>> 1) http://www.freebsd.org/cgi/man.cgi?query=lagg
>> >>>
>> >>>
>> >>>>
>> >>>> about multiply GWs: you can set multiply gw via setfib(1) utility and
>> >>>> use fib in your firewall rules. But it is not very handy with DHCP and
>> >>>> rc(8) (setfib is located in /usr/bin and can't be used in /etc/rc.d).
>> >>>> Due to this I have to add another FreeBSD box to handle dynamic
>> >>>> routes.
>> >>>>
>> >>>> This is the one thing I know which can I do in linux easily and in
>> >>>> freebsd with hacks.
>> >>>
>> >>> --
>> >>>
>> >>>  Regards,
>> >>>
>> >>>  J. Hellenthal
>> >>>  JJH48-ARIN
>> >>>  0x89D8547E
>> >>>
>> >>>
>> >>
>> >>
>> >> I don't think lagg(4) will work here, as its designed for two
>> >> interfaces that are attached to the same network (see the example in
>> >> the man page). For two different ISPs, I think the setfib approach is
>> >> probably the way to go.
>> >>
>> >>
>> >> -Proto
>> >>
>> >
>> > Actually I think the OP is asking about the "options RADIX_MPATH" feature.
>> >
>> > 1) Yes, It can balance over the two links but only using Modulo-N Hash (RFC2991) algorithm, and probably you should setup NAT on both links.
>> > 2) AFAIK there is no dead gw detection code yet.
>> > 3) Yes you can do that. There were some fixes for handling interfaces with no-link but I was not able to see it working in my setup. e.g. the host still tries to send traffic to a interface with no link, effectively blackholing the traffic (this was tested on a soekris box with if_vr(4))
>> >
>> > IMHO the whole RADIX_MPATH stuff is still in experimental stage and needs some more work to work correctly.
>> >
>> > There is a recent thread about some improvements in RADIX_MPATH.
>> >
>> > Regards,
>> > Nikolay
>> >
>> > _______________________________________________
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>
> --
>
>  Regards,
>
>  J. Hellenthal
>  JJH48-ARIN
>  0x89D8547E
>
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