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Forum: PCMCIA Network Adapter Issues
Re: Question 2 PCMCIA cards in one laptop. Help please... (J Toy)
Date: 2000, May 01
From: David Hinds <>

This situation is specifically covered in the HOWTO, in the section on
installation and configuration problems.  You may just have an
interrupt conflict with whatever irq the second card is getting.

However, I'm a little concerned by how you say you're testing this
setup.  You cannot test a two-network-card setup by just unplugging
the cable from one card and connecting it to the other card.  The
kernel has a static table of routing information, and if it is routing
a given address to one interface, it isn't going to decide to use the
other interface just because the cable moved.

You say you configured both cards as 192.168.0.x/24, so they are on
the same subnet.  The route for the 192.168.0.x network is going to
have to point to one interface or the other: it can't point to both.
To test as you describe, when you move the cable, you would also need
to update the network routing to re-route addresses on this subnet to
the newly connected interface.

You do say you already have an IPMASQ server set up, so you must have
gotten two cards configured properly on that system.

To override a card's hardware address, which should almost never be
necessary, you could put an appropriate "ifconfig" command in the
start_fn() definition in /etc/pcmcia/network.opts.

-- Dave

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