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I've been a happy IP-masq user for almost 2 years now. Well, until 2 days
ago. My linux box died, hardware problem. Either the scsi card or the
harddrive, not completely sure which.
The masq box was an old 486 VLBus/ISA system I had, and I happened to have
another one shoved in a corner. Same basic setup, 486dx2/66, 16MB ram, 500MB
hd (this one ide, not scsi), and a cdrom conencted to a soundblaster card
instead of a scsi cdrom. I moved the ethernet cards form the old box to the
new one, both nics are identical NE2000 clone cards, ISA interface, 10mbit.
I got linux (RedHat v5.2, kernel 2.0.36, same as I had on the old box. Yes,
I should probably grab the 2.0.38 sources and upgrade.) installed on the box
with no problems. It recognizes both cards, shows them in 'ifconfig'.
eth0 is given an IP address by dhcp from my cablemodem isp, and it is
getting its IP address correctly. Didn't even have to call the isp since I
was using the same nic, they didn't have to change a MAC address in their
dhcp server. I can get to the outside world, browse the internet, all that
stuff from the linux box.
eth1 is 192.168.0.1 and is connected to the internal house network. This is
where my problem is. I can ping 192.168.0.1 (the linux box IP) from the
linux box, but cannot ping any other machines on the internal house lan, for
example "ping 192.168.0.10" gives 100% packet loss. The green light on the
back of the nic is lit, just like eth0, and the light on the hub is also
lit, like all the other nics. Other machines on the house lan can (still)
ping each other, but cannot ping the linux box, get a timeout trying. The
other machines in the house are all win98 or win98se boxes.
I thought I'd had a difficulty related to this the last time I set up a
linux masq box (April 1999, about 20 months ago, I don't remember much and
didn't take notes.. oops) so I recompiled the kernel with the ne2000 driver
built-in, rather than as a loadable module. Installed the kernel, and put
append = "ether=10,0x300,eth0 ether=5,0x280,eth1"
in the lilo.conf before running lilo to install the kernel. The kernel
detects both cards on bootup (seems to detect them earlier in the boot
process than with the driver as a loadable module), and still does dhcp on
eth0 correctly. Other than detecting the card, it seems to ignore eth1 on
bootup, which seems right for a manual-config static-IP nic.
I am guessing here that I have a routing problem.
>From the tests in the IP Masq HOWTO, I pass 5.1 with the windows box pinging
itself. I pass 5.2 with the linux box pinging itself. I pass 5.3 with the
linux box pinging the outside world. DNS even works.
I stop at "5.4 Testing local PC to Linux connectivity" I checked the things
mentioned in "If this fails" and none of those seem to be my problem. Green
light on the back of the linux box nic, green light on the back of the masq
client machine, green light on the hub, and the masq clients can ping each
other. I didn't check the client config, because I didn't change it from
before the old linux masq server died, and set up the new linux box with the
same internal IP, 192.168.0.1, so they should still point to it as the
gateway.
My route table shows this:
Destination Gateway Netmask Flag Use Interface
24.214.x.129 0.0.0.0 255.255.255.255 UH 2 eth0
192.168.0.1 0.0.0.0 255.255.255.255 UH 0 eth1
24.214.x.128 0.0.0.0 255.255.255.128 U 1 eth0
192.168.0.0 0.0.0.0 255.255.255.0 U 3 eth1
120.0.0.0 0.0.0.0 255.0.0.0 U 2 lo
0.0.0.0 24.214.x.129 0.0.0.0 UG 4 eth0
I added the host entry for 192.168.0.1 myself with "route add -host
192.168.0.1 eth1" thinking that it might have needed that. Didn't help.
I've been reading through the NET HOWTO, do I need to do something like
this?
route add -net 192.168.0.0 netmask 255.255.255.0 eth1
It looks like there is already a line there for that, the 4th line in the
route table above.
I'm kind of guessing I'm missing somethign that will seem simple in
hindsight. Anyone want to point out things to check?
Tim Floore
[EMAIL PROTECTED]
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