route add default gw 192.168.1.1 (this IP is A).

in that etap route not need at all, i think, because in "internal network" is no further going \ routes.
gateway is need only if it must be routing via networks \ going to internet from machine B...

First, to thank you for your nice posts. Secondly, it seems to me the modem is really a modem-router because I am having internet through the switch! However, B machine gave errors when booting. I got Maybe it is 192.168.1.2?

EDIT: on the other hand I have no gw on either 12.0 or 14.0.

maybe. it do not remember your adressing, first three digit groups must be the same on both machines, if your netmask is 255.255.255.0 i e on both machines you must be 192.168.0.x or or 192.168.1.x, not mixed.
about internet via switch - as i tell you agree, switch is transparent network device. no matter, your modem is connected to your ethernet port on computer, or via switch - it is be same thing, as so, there is no "modem router".
modem can be router if you can distribute internet from it to all your local computerts at the same time, on whole internal network. but as i understand, your router cannot be configured to have "lowered" address like 192.168.x.x and distribute internet access from that whole network...

gw on this stage not necessary, except that one, who goes from dhcp for machine connected to modem, and need in that case, for internet on it is working.

As to the gw command, I think you have made a typo. It is not in slackaware 14.0. What does it do?

gw is not a command. Correct. gw is an optional argument to route.

nothing to do. it be automatic, as before that ( as i understand, your modem is working with your linux box, and internet is already working?)

Yes, internet working in A. Now, what is the syntax for 'route' in /etc/rc.d/rc.inet1.conf? I am at one inch of success.

from man route(8):

That might be what you have done with the gw argument.

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Up to now I have done, in A:

# ifconf eth0 192.168.1.1 netmask 255.255.255.0
# route add default gw 192.168.1.1
Then in etc/rc.d/rc.local, I added line
/sbin/ifconfig eth0:0 192.168.0.1 netmask 255.255.255.0

Here A takes either 192.168.0.1 or 192.168.1.1 without complaining.

In B:
# ifconf eth0 192.168.1.2 netmask 255.255.255.0
Then in /etc/rc.d/rc.inet1.conf, I added line
ip 192.168.0.2

Here 'ip 192.168.0.2' and 'ip 192.168.1.2' both give errors.

Booted both A and B and I had internet in A. It's a pity such a good track I had at last found is really a dead end, though not your fault, of course. Anyway, to have understood that the switch is really transparent, in the same way as a splitter, is a very good thing. Of course, I can't now ping.

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in /etc/rc.d/rc.inet1.conf conf on machine B write address, who you given in aliase ( eth0:0) for machine A. but link between A and B works also without that.

oh, mai god!

machine A is with internet. do it in A:
in etc/rc.d/rc.local, I added line
/sbin/ifconfig eth0:0 192.168.0.1 netmask 255.255.255.0


in machine B do:
in /etc/rc.d/rc.inet1.conf

# Config information for eth0:
IPADDR[0]="192.168.0.2"
NETMASK[0]="255.255.255.0"
USE_DHCP[0]=""
DHCP_HOSTNAME[0]=""


# Default gateway IP address:
GATEWAY="192.168.0.1"

then, restart both. after restart all must be worked.

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And cross your fingers. It also helps.

do not think so. it may help in any different cases, but in this is all are very,very basic and simple.
there is not need to cross fingers to get work that things, imho

Will machine B also have internet through the alias?