I have heard of some ISP's combining 2 network connections for you. I'm not
sure how this worked or how they did it however, and I fear it could have
just bee 2 lines but going in to 1 when it got to your house, so you still
have 2 IP address's. Unless you combine the 2 lines into 2 outgoing IP
address's, each line has it's own IP Address, but you have 1 singular IP
address as your out going, but you would still be going over different
paths, so problems and you would need to get a 3rd IP address from your ISP,
which they may not give you

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of
(private) HKS
Sent: 02 April 2009 22:03
To: misc
Subject: Re: Using 2 internet connections on OpenBSD Gateway

On Thu, Apr 2, 2009 at 4:52 AM, LeiV <[email protected]> wrote:
> Hi,
> I have a openbsd firewall/gateway and behind a webserver, users arrive to
my
webserver via 1 domain name, I have a cable connection 12Mbps down/500Kbps
up....the down speed is OK I dont have so many incoming requests ...but the
up
speed is saturated easily with those requests as my pages have images,
etc...
> I would like to add another internet connection to my openbsd box so I can
increase my upstream bandwitch...it is possible? all my incoming requests
will
come with the same internet connection as I only have 1 domain name....can I
send back the requested pages with both connections to use both upstream
bandwitch ? is so, how can i do it ? any howto?
>
> Thanks
>
> --
> View this message in context:
http://n2.nabble.com/Using-2-internet-connections-on-OpenBSD-Gateway-tp25740
7
5p2574075.html
> Sent from the OpenBSD Misc mailing list archive at Nabble.com.


In a nutshell, no you can't.

Unless your ISP can bond a pair of connections to a single IP, or load
balance incoming traffic over two IPs. Or if you want to do
round-robin DNS load balancing (bad idea) so some incoming requests
hit one IP, some hit the other. Or if you get your own AS and talk BGP
with your providers.

But you can't take requests in to one IP and send the reply out from
another (think about state). A good ISP won't let you send traffic
over their network from an IP they didn't assign you, so you can't
spoof the from-address of the reply.

So unless you're willing to do some heavy lifting on network configuration,
no.

Instead of mucking about with this, you're better off buying a decent
VPS or dedicated server somewhere with a real network connection.

-HKS

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