Re: [PLUG] Dual routing question

[Kevin Brosius <kbrosius@kns.com>]

Okay, that's what I thought.  Sounds like the multi-path option in
Solaris is what I was looking for.  I'd like to be able to pull the
ethernet cable and have it fall back to wireless.  But the static
route's currently prevent that.

I could setup dual hostnames on both machines for the separate
routes/nets and then use those in combination with changing the default
route on the laptop.  I just wanted to avoid that confusion.

Kevin


"Jarvis, John" wrote:
> 
> Kevin,
> 
> As soon as you put two NIC cards in box that box turns into a router.
> So the short answer is you have to set route rules, luckily the kernel takes
> care of this for you.
> 
> long answer..
> 
> In your case where you have a wireless connection and a normal ethernet
> landline connection they will probably be on different networks so you
> shouldn't have any problems.
> for example:
> eth0:  192.168.1.1
> eth0:  192.168.2.1
> 
> Which ever network is your default route in the routing table will be the
> one you use.
> 
> If the two are on the same subnet then the kernel will pick one of the
> interfaces.. how it does it I believe is arbitrary.
> 
> for example in a class C network
> 
> eth0:  192.168.1.1
> eth1:  192.168.1.2
> 
> If you disconnect one of these, the kernel won't necessarily "fail over" to
> the second one.  Solaris has something called "network multipathing" that
> takes care of this exact type of scenario.  I am not sure if there is an
> equivelent in linux.
> 
> John
> 
> In your case where you have a wireless connection and a normal ethernet
> landline connection they will probably be on different networks so you
> shouldn't have any problems.
> for example:
> eth0:  192.168.1.1
> eth0:  192.168.2.1
> 
> Which ever network is your default route in the routing table will be the
> one you use.
> 
> -----Original Message-----
> From: Kevin Brosius [mailto:kbrosius@kns.com]
> Sent: Wednesday, February 13, 2002 1:08 PM
> To: PLUG
> Subject: [PLUG] Dual routing question
> 
> I'm curious about what happens if I specify dual IP addresses for
> machines on a local network.  For example, I have a laptop with a slow
> wireless interface and a network card.  When I setup each interface with
> different IP addresses, then I can send traffic over either interface.
> Is there a way to allow the same host name to use either interface/IP,
> preferably with the faster interface being used first?  (I'm using
> static name lookup from /etc/hosts at the moment.)
> 
> --
> Kevin Brosius
>

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