Date: Fri, 04 Feb 2005 17:54:38 -0500 From: Derek <derekm.nospam@rogers.com> To: questions@freebsd.org, tjg@meitech.com Subject: Re: Routing Problem Message-ID: <4203FD2E.6060705@rogers.com> In-Reply-To: <ctqj21$146m$1@FreeBSD.csie.NCTU.edu.tw> References: <ctqj21$146m$1@FreeBSD.csie.NCTU.edu.tw>
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Gustafson, Tim wrote:
> I know it "can" be done. I have a feeling that the FreeBSD TCP
> stack lacks the capability.
If you are looking for multiple routes to the same destination, you are
correct. I believe that if you see the thread on net@ from 03/01/04
with the subject "My planned work on networking stack":
<quote>
[] move IPv4 routing to its own optimized routing table structure and
add multi-path and policy-routing options. (planned)
</quote>
I think this is the feature you are looking for: multi-path
I am also not sure of the status of this.
There are some hackish ways of dealing with this:
eg.
route add 0.0.0.0/1 router1
route add 128.0.0.0/1 router2
(or some such hideous incantation)
If you want to get real nasty, I would try some jiggery pokery with
vlans/ng_one2many:
# receiving is done with public ips (all the same here as your current
config)
router1 vlan0 pubip1
router2 vlan0 pubip2
server vlan0 pubip1/2
#transmitting is done through faked gateway 50% load each
router1 vlan1 10.0.0.1
router2 vlan2 10.0.0.1
server vlan1/2 10.0.0.2
route add default 10.0.0.1
You'll need to be sure that both upstream providers will route either ip
address though. Also, there is no "dynamic" type of functionallity on
this, if one of the links goes down, you'll lose 50% of your traffic.
You could probably rig up a script to notify netgraph when the remote
g/w goes down though.
I've never tried this, but it seems this wouldn't be a bad way to start
if you've got some time on your hands.
Cheers,
Derek
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