gtaylor at riverviewtech
Jul 31, 2007, 8:01 AM
Post #2 of 2
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Re: load balancing over a very large number of outgoing addresses?
[In reply to]
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On 07/26/07 20:27, Chris Kanich wrote:
> I have recently developed a need to multiplex connections from within a
> NAT over several (hundred, even thousand if possible) external IPs. I
> can have all of these IPs routed to a single interface on my NAT box,
> however I am not exactly sure how to set up a random/round robin load
> balancing scheme such that outgoing connections from my network each get
> a random source address from my source address pool.
If I understand what you are wanting to do correctly, that is many to
many NAT, why not use a range of IP addresses on your SNAT rule? I.e.:
iptables -t nat -A POSTROUTING -j SNAT --to-source A.B.0.1-A.B.7.255
Would SNAT to an IP in the range of A.B.0.1 through A.B.7.255, thus a
little over 2000 IPs.
One thing I'm not sure of is how the kernel decides which IP in the
range to assign, though I bet someone on this mailing list can help
better answer this.
> However it seems that I cannot scale these routing rules past 255
> routes, and unlike the example, I am not multiplexing interfaces but
> only IPs in roughly a contiguous /16 range being routed to this linux
> machine.
*nod* I don't think this is what you are wanting to do.
> Any suggestions on how to get this up and running would be greatly
> appreciated.
See if what I presented above is any where close to what you are wanting
to do.
Grant. . . .
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