How to do a failsafe connection using TWO network links

Hi,
I would like to connect TWO ISP links to my computer, and if one fails, let the other one take over - how do I do this?


Thanks.

 

You have your computer periodically test link 1 and when it fails, set
up the routing tables to use link 2

 

I suggest doing it at the router level: Cisco RV042 or similar.

 

Use a dual-connection router. Business users often do this; any decent
computer hardware retailer will be able to advise you.

 

If he has two network interfaces with potential internet access, and a
decent OS, why should he buy external hardware? That's another piece
of equipment to place somewhere, provide with power and manage using
an unfamiliar interface.

He doesn't say he's running a whole network, or that he has extreme
bandwidths.

The actual question: sorry. No doubt something in Linux handles this,
but I don't know *what*. "Bonding" I'm familiar with, but that's of
no use here.

The "bring up interface #2 if #1 seems to have problems" suggestion
posted by someone works -- but presumably he wants some kind of
dynamic load distribution.

/Jorgen

 

google: multipath routing

 

Yes, you're absolutely right.

Yes, I do - I want the data transfer to a particular computer on the other side to happen through both interfaces, so I get the combined bandwidth.

....and "bring up interface 2"......did you mean by a shell script or something? That won't do, it's video and audio which will be cast over the net, it has to be *seamless*, there can't be any stutters in the video.


Thanks a lot for your help Jorgen.

 

Your news client generates broken/hard-to-read postings.
Please fix it.

If you want a single TCP connection to use both routes, that may be
even harder. But check that technology ("something-routing") someone
else mentioned a few days ago -- it's the best response you've got
so far.

....

It wasn't my idea; I was referring to someone else's reply.

/Jorgen

 

That was also an additional requirement. That is bonding. You will not
get it. It is far too hard for your computer tofigure out which packet
goes wwhere and to recover from errors.

Then it will never work. It takes a while to figure out that one route
has gone down. There is no message that is sent saying "the wire has
been cut" or "a fire has destroyed the router on this path". It must
wait to see what is happening and only after some timeout can it try the
other path. That will drop video. Install a dedicated line between the
two sites, but that will not prevent a truch or a backhoe from severing
the link.