Clueless Network Prob

[Kevin O'Gorman]

I too could be wrong, but here's my $.02.  You can have more than one interface
on a given net, but you're going to need special software to make effective
use of them.  Standard routing tables, for instance, will direct traffic to
just one of them, putting that interface number as the return address, so
return traffic will use that one too.  You might be able to split your
traffic according to the destination, but that is going to be useful only in
very special circumstances.

I have heard of such arrangements being used to improve bandwidth, but I'm
not convinced that this would work in the most common cases.

So the question becomes: what are you trying to achieve, and what is the
environment like?

++ kevin


On Sat, Jun 22, 2002 at 04:29:27PM -0400, Matthew Carpenter wrote:
> I could be wrong, but I'm pretty sure you can't.  If you have two adaptors on one subnet, which will it use for origination?  If you do subinterfaces on the SAME adaptor, at least the interface has a real address which it can use to originate and open connections.  If I'm incorrect, please let me know... not that I'm sure why you would WANT two adaptors on one subnet, except to port-channel, and that's a different story altogether.
> 
> begin  "Michael Hipp" <mhipp at redmule.com>
> (Fri, 21 Jun 2002 16:28:47 -0500)
> 
> > Matthew,
> > 
> > Is it just an impossibility to have 2 adapters on 1 subnet?
> > 
> > Thanks,
> > Michael
> > 
> > On Friday 21 June 2002 02:02 pm, Matthew Carpenter wrote:
> > > You, you fix this by having only one adaptor per subnet.  If you really
> > > want to have the box dually-connected, plug each interface into a
> > > different subnet.
> > >
> > > On Fri, 21 Jun 2002 11:17:04 -0500
> > >
> > > "Michael Hipp" <mhipp at redmule.com> wrote:
> > > > Thanks Net Llama!
> > > >
> > > > I corrected a problem of wrong gateway and now am down to this (route
> > > > -n): Destination     Gateway         Genmask         Flags Metric Ref
> > > > UseIface 192.168.0.0     0.0.0.0         255.255.255.0   U     0      0
> > > >       0 eth1
> > > > 192.168.0.0     0.0.0.0         255.255.255.0   U     0      0        0
> > > > eth1 127.0.0.0       0.0.0.0         255.0.0.0       U     0      0
> > > >   0 lo
> > > > 0.0.0.0         192.168.0.1     0.0.0.0         UG    0      0        0
> > > > eth0
> > > >
> > > > A nearby Red Hat box with only one eth looks like this:
> > > > Destination     Gateway         Genmask         Flags Metric Ref
> > > > UseIface 192.168.0.0     0.0.0.0         255.255.255.0   U     0      0
> > > >       0 eth0
> > > > 127.0.0.0       0.0.0.0         255.0.0.0       U     0      0        0
> > > > lo 0.0.0.0         192.168.0.1     0.0.0.0         UG    0      0
> > > > 0 eth0
> > > >
> > > > Should there be 2 lines per eth? Do you fix it by doing 'route add' and
> > > > 'route del'.
> > > >
> > > > Any help appreciated,
> > > > Michael
> > > >
> > > > On Friday 21 June 2002 08:51 am, Net Llama! wrote:
> > > > > Look at your routing table (route -n).  That is where all of the
> > > > > problems lie.
> > > >
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> 
> -- 
> Matthew Carpenter
> matt at e-i-s.cc                          http://www.e-i-s.cc/
> 
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-- 
Kevin O'Gorman  (805) 650-6274  mailto:kevin at kosmanor.com
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