Networking Question

[Greg Kettmann]

Thank you Ben, and all who responded.

Yes, that was the overwhelming consensus, the single router/firewall 
solution feeding two gateways.  It makes perfect sense.

Have a great weekend.

Greg

On 11/7/2015 9:40 PM, Ben Scott wrote:
> On Fri, Nov 6, 2015 at 9:48 AM, Greg Kettmann <greg at kettmann.com> wrote:
>> For various reasons, including reliability, I have two ISP's.  In my
>> original configuration I had two Gateways, GW1-192.168.1.1 and
>> GW2-192.168.1.2 on one subnet.
>    You're better off having a single router, as the sole gateway on
> your LAN, and having the router decide which ISP to use.  That's what
> routers are for, to choose the best network route.
>
>    If you have multiple local networks for other reasons (e.g., work vs
> home, or guests, etc.), apply the same principle to all of them.  One
> router, multiple local networks, multiple Internet connections.
>
>    Note that "router" here could be a COTS solution (Cisco, Netgear,
> et. al.), or a cheap home gateway running something like DD-WRT, or a
> general-purpose computer running Linux or even a BSD.
>
>    If it's simply about having Internet if an ISP goes down, all you
> need is a way to detect which ISP is up.  If both ISPs send RIP
> advertisements, you just need to run a basic routing daemon.  If not,
> you'll need something that can detect what's up and what's not.
> Google "dead gateway detection linux".
>
>    If it's a matter of also making the best use of both ISPs when both
> are up, that's usually called load balancing.
>
>    If you want certain traffic to go over certain ISPs when possible
> (e..g, work stuff uses ISP A, Netflix uses ISP B), that's called
> policy routing.
>
>    The http://lartc.org/ site has some good info on both of the latter
> two, although it's getting a bit stale from lack-of-updates.
>
>    If you need help configuring some aspect of that, describe which aspect.
>
> -- Ben
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