Mailing List Archive: [lvs-users] Exploring the possibility of using LVS as a gateway/router

[lvs-users] Exploring the possibility of using LVS as a gateway/router

Sep 27, 2018, 2:18 PM

Post #1 of 4 (515 views)

Hi everyone,

I understand that LVS is mostly used as a load balancer.

I'm curious to see if it can also work as a linux gateway/router, where
instead of load balancing a specific service IP/port, it can route traffic
based on routes in kernel routing table or otherwise.

The reason this interests me is that if this works with the DR method, it
can theoretically reduce the load on a normal NAT gateway/router.

It would be great if someone can share any insights about this.

Thanks so much!

Best,
Aman
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Re: [lvs-users] Exploring the possibility of using LVS as a gateway/router [ In reply to ]

wagner.ferenc at kifu

Sep 27, 2018, 10:52 PM

Post #2 of 4 (515 views)

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Amanpreet Singh <aps.sids@gmail.com> writes:

> I'm curious to see if it can also work as a linux gateway/router, where
> instead of load balancing a specific service IP/port, it can route traffic
> based on routes in kernel routing table or otherwise.

The kernel does exactly that without LVS.

> The reason this interests me is that if this works with the DR method, it
> can theoretically reduce the load on a normal NAT gateway/router.

It isn't clear to me what you miss from the standard kernel routing. If
you don't do NAT, you do DR.
--
Regards,
Feri

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Re: [lvs-users] Exploring the possibility of using LVS as a gateway/router [ In reply to ]

aps.sids at gmail

Sep 27, 2018, 11:19 PM

Post #3 of 4 (515 views)

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Thanks for your response.

> The reason this interests me is that if this works with the DR method, it
> > can theoretically reduce the load on a normal NAT gateway/router.
>
> It isn't clear to me what you miss from the standard kernel routing. If
> you don't do NAT, you do DR.
>

Oh. I thought standard kernel routing wasn't possible without NAT. All the
info I've managed to find so far is NAT-related.
Could you please point me to a resource about how to do standard routing
without NAT?

Thanks again!

Best,
Aman
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Re: [lvs-users] Exploring the possibility of using LVS as a gateway/router [ In reply to ]

netdev at bof

Sep 27, 2018, 11:55 PM

Post #4 of 4 (515 views)

Permalink

On Fri, Sep 28, 2018 at 8:22 AM Amanpreet Singh <aps.sids@gmail.com> wrote:
>
> Could you please point me to a resource about how to do standard routing
> without NAT?

Umm, are you asking how basically linux can be used for routing? It
can, in an incredible number of different ways / scenarios...

http://www.tldp.org/HOWTO/Adv-Routing-HOWTO/

Basic approach: enable ip forwarding (see your /etc/sysctl.conf /
google for "linux ip_forward"), and if you have iptables enabled, fill
your FORWARD chain with suitable stuff...

best regards
Patrick

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