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Date: Thu, 12 Jul 2001 14:35:20 -0700 (PDT)
From: Joseph Garcia <bear@buug.homeip.net>
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Subject: How do I Route 3 different networks On One Interface
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Hi!

Okay, so this might sound goofy some of the seasoned routing
proffesionals, but I'm taking a Cisco Routing class and I wanted to
practice some basic routing concepts using FreeBSB.

Right now I have been challeged by this problem that I have been
experimenting with my co-workers (who are also taking the class).  Here's
our experiment. We have 3 networks:192.168.0.0/24, 192.168.10.0/24, and
192.168.100.0/29 which we would like to have packets routed to and from.

This is what I have tried to do.  I have successfully set up a FreeBSD box
with one network interface (I know it might work better with 3 network
interfaces, but I'm limited to one) with the IP addresses: 192.168.0.8,
192.168.10.100, and 192.168.100.1 with their corresponding netmasks.
Here's my output of ifconfig:

[14:24] root@unix (~) # ifconfig tl0:
	flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        inet6 fe80::280:5fff:feb6:3731%tl0 prefixlen 64 scopeid 0x1
        inet 192.168.0.8 netmask 0xffffff00 broadcast 192.168.0.255
        inet 192.168.10.100 netmask 0xffffff00 broadcast 192.168.10.255
        inet 192.168.100.1 netmask 0xfffffff8 broadcast 192.168.100.7
        ether 00:80:5f:b6:37:31
        media: autoselect (10baseT/UTP) status: active
        supported media: autoselect 10baseT/UTP <full-duplex> 10baseT/UTP
10base5/AUI 10base2/BNC 10baseT/UTP <hw-loopback> none
faith0: flags=8000<MULTICAST> mtu 1500
gif0: flags=8010<POINTOPOINT,MULTICAST> mtu 1280
gif1: flags=8010<POINTOPOINT,MULTICAST> mtu 1280
gif2: flags=8010<POINTOPOINT,MULTICAST> mtu 1280
gif3: flags=8010<POINTOPOINT,MULTICAST> mtu 1280
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
        inet6 fe80::1%lo0 prefixlen 64 scopeid 0x7
        inet6 ::1 prefixlen 128
        inet 127.0.0.1 netmask 0xff000000
ppp0: flags=8010<POINTOPOINT,MULTICAST> mtu 1500
sl0: flags=c010<POINTOPOINT,LINK2,MULTICAST> mtu 552

Also, I have workstations on each of the networks.  I have set the sysctl
variable net.inet.ip.forwarding to 1.  The workstations seem to be able to
ping all the IP addresses on the FreeBSD box, but not any further.  I'm
guessing that packets aren't being forwarded, but I don't know why.  I'm
thinking that it has to do with my routing table.  I'm not too familiar on
how to setup the routing table when 3 networks are on the same interface.

I hope this all makes some sense.  Thanks for any help.  I'm sure this is
something simple that I'm overlooking.

TIA,

Joey



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