topic Re: Cannot ping win box from linux or linux from windows. in Operating System - Linux

Cannot ping win box from linux or linux from windows.

Greg Smelser — Thu, 30 Nov 2000 23:24:10 GMT

I had this setup once before, then upgraded and wrecked everything. I can ping both nics and internet on the Linux box but not the Windows lan. I can ping each
(4) windows box in the lan but not the linux box.
I have a DSL conn I would like to share with the lan using the Linux box as firewall. Here are some conf specs let me know what else is needed.

ifconfig:
eth0
Link encap:Ethernet HWaddr 00:C0:F0:3C:21:6F
inet addr:33.222.222.222 Bcast:33.222.222.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

eth1
Link encap:Ethernet HWaddr 00:80:C6:F7:1D:0F
inet addr:192.168.0.20 Bcast:192.168.0.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

lo
Link Encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:3924 Metric:1

------------------------------------------------------
ifcfg-eth0: DEVICE="eth0"
BOOTPROTO="none"
BROADCAST="33.222.222.255
IPADDR="33.222.222.222"
NETMASK="255.255.255.0"
NETWORK="33.222.222.0
ONBOOT="yes"
----------------------------------------------------------
ifcfg-eth1: DEVICE="eth1"
BOOTPROTO="none"
IPADDR="192.168.0.20"
NETMASK="255.255.255.0"
ONBOOT="yes"
---------------------------------------------------------
network: NETWORKING=yes
FORWARD_IPV4="yes"
HOSTNAME="server.someone.com"
DOMAINNAME="someone.com"
GATEWAY="33.222.222.254"
GATEWAYDEV="eth0"
----------------------------------------------------------
hostname: server

hosts: 127.0.0.1 localhost.localdomain localhost server
33.222.222.222 someone.com someone
192.168.0.20 lan.someone.com
-------------------------------------------
hosts.allow:
#
# hosts.allow This file etc.etc.etc.
#
#
ALL:LOCAL
ALL:192.168.0.0/255.255.255.0

-----------------------------------------------------------
hosts.deny:
#
# hosts.deny This etc.etc.etc.
#
#
#
# The portmap line is etc.etc.etc.
#

ALL:ALL
---------------------------------------------------------------
ipmasq:
LOCALNET=192.168.0.20/255.255.255.0
---------------------------------------------------------------------
Kernel 2.2.12-20
Red Hat ver.6.1

Re: Cannot ping win box from linux or linux from windows.

Tim Malnati — Sat, 02 Dec 2000 00:11:47 GMT

Everything looks like it should work. Can you ping your default gateway device (33.222.222.254)? If you can't, the ip and/or mask to it is probably wrong.

Re: Cannot ping win box from linux or linux from windows.

Albert E. Whale, CISSP — Sat, 02 Dec 2000 02:57:07 GMT

Greg,

What does a netstat -rn report? What run level are in you in?

Re: Cannot ping win box from linux or linux from windows.

Tom Emerson — Sat, 02 Dec 2000 04:09:46 GMT

I get the feeling what you've checked is a red herring that is leading you astray...

To clarify:

-- the LINUX box has two NICS:
-- NIC 1 is set to 32.222.222.222 [really?]
presumably, this goes "to the internet"
-- NIC 2 is set to 192.168.0.22
presumably, this is your internal (windows) LAN
-- there are 4 "windows" boxes; IP addresses not given, however they CAN ping each other, correct? [if not, I think you'll see the problem pretty quickly now...]

So, what is the address of the windows boxes? They SHOULD be 192.168.0.xx where xx is anything from 1 to 254 exclusive of 22 [your linux box]

IF your windows boxes are set to "retrieve an IP address automatically", then the "problem" is that you don't have a local DHCP server running [which SHOULD be run from the linux box...]

IF they are set to something entirely different, well, I think we found the proper herring... :)

if indeed they are set to 192.168.0.xx, then the thing to check is the cable between the hub and the linux box -- are the lights lit? try swapping cables and/or reseating the cables -- you might have inadvertantly put in a "crossover" cable (which would be needed between a DSL modem and a hub, or in cases where you are using twisted-pair cables between two and only two computers and have no "hub"] [also, in rare cases, some hubs have a "crossover/normal" switch which will change the way a particular port is "wired"]

So, if you're at this point, you've verified:
1) the windows boxes are configured on the 192.168.0 network
2) the cables are "good"
3) [possibly] the NIC card in the linux box is OK (when you checked for synch lights, remember?)
if you STILL cannot get a "ping" to work between the windows & linux machines, well, it's time to bring in an expert to physically inspect things -- that's about the limit of my over-the-internet-webpage-troubleshooting I can do :)

Tom

Re: Cannot ping win box from linux or linux from windows.

Volker Borowski — Fri, 08 Dec 2000 09:28:10 GMT

Just a silly idea: May be your Upgrade switched ETH0 and ETH1 on the driver side ?
So you Box is right opposite connected now ?
Volker

Re: Cannot ping win box from linux or linux from windows.

Greg Smelser — Fri, 08 Dec 2000 17:25:20 GMT

It's fixed! Chose to Up-grade one more time to RH 7.0,
what was there to lose, went thru the up-grade with no
problems and now everything works just fine, go figure.
I did not do anything different to my configuration before the upgrade, but when it was through upgrading I had no problems. I think the Linux box overheard me talking about Win 2000 haha, thanks anyway for the help.