I think you will find your network construction is the problem. I think
this is what you want:
INTERNET
|
|
|
DSL Modem
|
|
m5
|
|__________ROUTER
|
|
|
________________
| | | |
| | | |
m1 m2 m3 m4
HTH,
Bill
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On Behalf Of Harry Putnam
> Sent: Friday, May 03, 2002 10:22 AM
> To: [EMAIL PROTECTED]
> Subject: networking puzzle
>
>
> [NOTE Windbag ALERT.. what follows seemed necessary to
> give enough detail for a helpfull reply..sorry]
>
> Setup: RH 7.1 (two nics
> RealTek RTl8029
> (NETGEAR) Lite-On 82c168 PNIC)
> Home network DSL connected.
> Hardware router/gateway at DSL MODEM
>
> Background info:
> I've been running with only one of the above nics activated for a
> very long time. The Realtek My setup looked like
>
> INTERNET
> |
> dsl modem
> |
> ROUTER (gateway) NETGEAR FR314
> |
> ---------------------------------
> | | | | |
> m1 m2 m3 m4 m5
>
> I'm working machine 5 in the picture.
>
>
> I wanted to do some experimenting with iptables and ipmasquerade.
> Something I had going before installing the hardware router about 1
> yr ago. So don't remember all the config problems etc.
>
>
> What I've run into is that after configuring the second nic and being
> able to ping it from the machine it is located on. I'm not able to
> ping the machines I hooked up to it. Machines 1-4 in the picture
> below. Thru a simple hub
>
> INTERNET
> |
> dsl modem (Static IP)
> |
> ROUTER (gateway) NETGEAR FR314 192.168.0.1
> |--eth0 192.168.0.5
> --M5--
> |--eth1 192.168.0.10
> -----Simple hub (Netgear DS108)--------
> | | | |
> m1 m2 m3 m4
>
>
> On a reboot, the messages say eth0 and eth1 came up ok.
> Dmesg shows them on the same IRQ (9) (I remember that being the
> case before too, so don't think that is a problem)
>
> Tail of dmesg:
> [...]
> ne2k-pci.c:v1.02 10/19/2000 D. Becker/P. Gortmaker
> http://www.scyld.com/network/ne2k-pci.html
> PCI: Assigned IRQ 9 for device 00:08.0
> eth0: RealTek RTL-8029 found at 0xd800, IRQ 9, 00:00:E8:90:99:20.
> Linux Tulip driver version 0.9.15-pre6 (July 2, 2001)
> PCI: Found IRQ 9 for device 00:09.0
> tulip0: MII transceiver #1 config 3000 status 7809
> advertising 01e1.
> eth1: Lite-On 82c168 PNIC rev 32 at 0xc8838000, 00:A0:CC:59:6B:FC,
> IRQ 9.
>
> Ifconfig shows them both up:
> [...]
> eth0 Link encap:Ethernet HWaddr 00:00:E8:90:99:20
> inet addr:192.168.0.5 Bcast:192.168.0.255
> Mask:255.255.255.0
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:858 errors:0 dropped:0 overruns:0 frame:0
> TX packets:989 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:100
> Interrupt:9 Base address:0xd800
>
> eth1 Link encap:Ethernet HWaddr 00:A0:CC:59:6B:FC
> inet addr:192.168.0.10 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:0 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:100
> Interrupt:9 Base address:0x8000
> [...]
>
> Netstat -nr shows this picture:
> Kernel IP routing table
> Destination Gateway Genmask Flags MSS Win irtt Iface
> 192.168.0.0 0.0.0.0 255.255.255.0 U 40 0 0 eth0
> 192.168.0.0 0.0.0.0 255.255.255.0 U 40 0 0 eth1
> 127.0.0.0 0.0.0.0 255.0.0.0 U 40 0 0 lo
> 0.0.0.0 192.168.0.1 0.0.0.0 UG 40 0 0 eth0
>
> Can't remember if I have to do something tricky about the gateway.
> Trying to ping any of the connected local machines fails:
>
> reader $ ping 192.168.0.4
> PING 192.168.0.4 (192.168.0.4) from 192.168.0.5 : 56(84)
> bytes of data.
> From 192.168.0.5: Destination Host Unreachable
> [...]
>
> Looks like I may be pinging thru the wrong nic. 192.168.0.5 is the
> internet side (eth0). But shouldn't 192.168.0.10 (local eth1) carry
> the ball in that case?
>
> If I shut down 192.168.0.5 then the 192.168.0.10 nic tries:
> root # ping 192.168.0.4
> PING 192.168.0.4 (192.168.0.4) from 192.168.0.10 : 56(84) bytes of
> data.
> From 192.168.0.10: Destination Host Unreachable
> [...]
>
> what fundamental thing am I forgetting here?
>
>
>
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