Re: IP masquerade question

[Kevin Colby <kevinc grainsystems com>]

Wow.  Good call Nabeel!
I missed that sentence and was drawing a blank for a second.

Nabeel is correct.  10baseT is designed so that a "straight"
cable is for card<->hub communication.  In order for a card
to talk to another card, you must reverse all the pins
(which you do most easily by purchasing a crossover cable).

You will still need to IP forwarding turned on, but the cable
will start letting ping work between the machines, at least.

	- Kevin Colby
	  kevinc grainsystems com


NS Kandah wrote:
> 
> Go down to your friendly computer store and ask for a crossover cable with
> RJ45 connectors. Otherwise you need to use a hub to connect the two
> machines together.
> 
> Nabeel
> 
> On Mon, 29 May 2000, Brian A Bucher wrote:
> 
> >
> > Greetings again,
> >
> > I'm trying to use my linux box to perform IP-masquerading
> > and firewalling.  So far I haven't had much luck in even
> > getting the basics to work.  I've been trying to get the
> > multiple-interfaces setup going, but no luck.
> >
> > The linux box is presently connected to the net using
> > eth0 at 204.167.104.162 through a router 204.167.104.161
> >
> > I'm trying to get eth1 set up at 192.168.0.1, to use as
> > a gateway for a local MASQ'd network.
> >
> > I have a test Win98 PC with settings:
> > IP      192.168.0.100
> > Gateway 192.168.0.1
> > Netmask 255.255.255.0
> >
> > I have the network card of the test PC connected (with RJ45 cable)
> > to the eth1 network card in the linux box.
> > The test PC can ping itself (.100), but it can't ping 192.168.0.1
> > I also can't ping the PC from the linux box.
> >
> > I've been trying to RTFM as much as possible, but it's time to
> > stop and ask for directions. :)
> >
> > Any suggestions would be appreciated!
> >
> > Thanks,
> > Brian
> >
> >
> >
> > Here are the relevant files (that I know of) for this setup:
> >
> > --------------------------------------------------------------
> > /etc/sysconfig/network
> >
> > [root /etc/sysconfig]# more network
> > NETWORKING=yes
> > FORWARD_IPV4="no"
> > HOSTNAME="npisrv1.n-p-i.net"
> > DOMAINNAME="n-p-i.net"
> > GATEWAY="204.167.104.161"
> > GATEWAYDEV="eth0"
> > IPX="no"
> > IPXINTERNALNETNUM="0"
> > IPXINTERNALNODENUM="0"
> > IPXAUTOPRIMARY="on"
> > IPXAUTOFRAME="on"
> > NISDOMAIN=""
> > [root /etc/sysconfig]#
> > --------------------------------------------------------------
> > /etc/sysconfig/network-scripts/ifcfg-eth0
> >
> > [root /etc/sysconfig/network-scripts]# more ifcfg-eth0
> > DEVICE="eth0"
> > IPADDR="204.167.104.162"
> > NETMASK="255.255.255.224"
> > ONBOOT="yes"
> > BOOTPROTO="none"
> > IPXNETNUM_802_2=""
> > IPXPRIMARY_802_2="no"
> > IPXACTIVE_802_2="no"
> > IPXNETNUM_802_3=""
> > IPXPRIMARY_802_3="no"
> > IPXACTIVE_802_3="no"
> > IPXNETNUM_ETHERII=""
> > IPXPRIMARY_ETHERII="no"
> > IPXACTIVE_ETHERII="no"
> > IPXNETNUM_SNAP=""
> > IPXPRIMARY_SNAP="no"
> > IPXACTIVE_SNAP="no"
> > [root /etc/sysconfig/network-scripts]#
> >
> > --------------------------------------------------------------
> > /etc/sysconfig/network-scripts/ifcfg-eth1
> >
> > [root /etc/sysconfig/network-scripts]# more ifcfg-eth1
> > DEVICE="eth1"
> > IPADDR="192.168.0.1"
> > NETMASK="255.255.255.0"
> > ONBOOT="yes"
> > BOOTPROTO="none"
> > IPXNETNUM_802_2=""
> > IPXPRIMARY_802_2="no"
> > IPXACTIVE_802_2="no"
> > IPXNETNUM_802_3=""
> > IPXPRIMARY_802_3="no"
> > IPXACTIVE_802_3="no"
> > IPXNETNUM_ETHERII=""
> > IPXPRIMARY_ETHERII="no"
> > IPXACTIVE_ETHERII="no"
> > IPXNETNUM_SNAP=""
> > IPXPRIMARY_SNAP="no"
> > IPXACTIVE_SNAP="no"
> > [root /etc/sysconfig/network-scripts]#
> > --------------------------------------------------------------
> >
> >
> > Here is the output of the relevant commands:
> >
> > --------------------------------------------------------------
> > [root ~]# /sbin/ifconfig
> > eth0      Link encap:Ethernet  HWaddr 00:D0:B7:1D:CE:A6
> >           inet addr:204.167.104.162  Bcast:204.167.104.191  Mask:255.255.255.224
> >           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
> >           RX packets:3555 errors:0 dropped:0 overruns:0 frame:0
> >           TX packets:5473 errors:0 dropped:0 overruns:0 carrier:0
> >           collisions:0 txqueuelen:100
> >           Interrupt:9 Base address:0xd000
> >
> > eth1      Link encap:Ethernet  HWaddr 00:D0:B7:1D:89:30
> >           inet addr:192.168.0.1  Bcast:192.168.0.255  Mask:255.255.255.0
> >           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
> >           RX packets:0 errors:0 dropped:0 overruns:0 frame:0
> >           TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
> >           collisions:0 txqueuelen:100
> >           Interrupt:5 Base address:0xb800
> >
> > lo        Link encap:Local Loopback
> >           inet addr:127.0.0.1  Mask:255.0.0.0
> >           UP LOOPBACK RUNNING  MTU:3924  Metric:1
> >           RX packets:4 errors:0 dropped:0 overruns:0 frame:0
> >           TX packets:4 errors:0 dropped:0 overruns:0 carrier:0
> >           collisions:0 txqueuelen:0
> >
> > [root ~]#
> > --------------------------------------------------------------
> > [root ~]# /sbin/route -n
> > Kernel IP routing table
> > Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
> > 192.168.0.1     0.0.0.0         255.255.255.255 UH    0      0        0 eth1
> > 204.167.104.162 0.0.0.0         255.255.255.255 UH    0      0        0 eth0
> > 204.167.104.160 0.0.0.0         255.255.255.224 U     0      0        0 eth0
> > 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         204.167.104.161 0.0.0.0         UG    0      0        0 eth0
> > [root ~]#
> >
> > --------------------------------------------------------------
> >
> >
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