[ILUG] Creating a multihomed host.

[Oisin Kim]

The card is set up to use a broadcsat IP address, 230.0.0.1, yet the ifconfig 
doesn't show this.
If I unplug the hub that each of the other network cards use (the ones that 
have been assigned regular IP addresses) the "shared data" is still up to 
date on the servers.
What it is is:
I'm using orion server (a web/application server) and I have a servlet 
running on each of 4 servers, the configuration of the server allows you to 
create a cluster of two or more server and share data between the servers in 
the cluster. This data is shared using a broadcast ip address.
And it works, which seems weird to me with my small understanding of linux 
networking.
I'll have a another dig around tomorrow and post anything I find thats 
interesting,
Thanks again for all the help,
Oisin

On Monday 13 August 2001 15:43, you wrote:
> On Mon, Aug 13, 2001 at 03:11:04PM +0100, Oisin Kim wrote:
> > One final point though:
> > >So in the ifconfig given
> > > eth1      Link encap:Ethernet  HWaddr 00:10:B5:AD:2F:E2
> > >           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
> > >           RX packets:0 errors:0 dropped:0 overruns:0 frame:0
> > >           TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
> > >           collisions:0 txqueuelen:100
> > >           Interrupt:11 Base address:0x5400
> > >
> > >this card will be seeing all the broadcasts, passing them to the OS
> > >which will then chuck them - as there are no protocols to deliver them
> > >to...
> >
> > In fact this card is actually working, it represents a broadcast address
> > that is used to keep shared data in sync between some application
> > servers. the reason that the values for packets are 0 is that I haven't
> > used it in a couple of weeks, (before my last reboot)
> > but it does work, I have used this set of cards as the only network by
> > unplugging the other hub.
>
> That's well bizarre ! You say you haven't used it in a couple of weeks -
> perhaps it worked then because it had an IP address. Right now, the
> ifconfig output says that the card has no IP address associated with it. If
> you disconnect the cable from eth0 NOW can you still e.g. ping other
> machines from this one. Or can you ping the IP address which you believe to
> be associated with eth1 ? If so, is there perhaps some kind of bonding of
> the two Ethernet interfaces in use so that you have some kind of failover ?
> Just a wild guess, as I can't see how otherwise you can pass IP traffic
> through that card.
>
> > Seems strange that it doesn't show the IP address I set in linuxconf
> > though as all regualr IP addresses show as normal. The Ip address is
> > shown in linuxconf still.
>
> What do you mean by "all regualr IP addresses show as normal" ? (I wouldn't
> worry about what Linuxconf thinks, BTW - that's just a reflection of its
> database why doesn't necessarily concur with reality)
>
>
>
>
> Niall

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