On 21 Aug 2003 16:35:03 -0700, chalawal@hotmail.com (Chalawal Maliwan)
wrote:

>- I can ping the internet but not traceroute from OSR5
>- I can do both ping and tracert from W2K to the Internet
>
>> Can you traceroute from OSR5 to any of the local machines by IP
>> address? If not, what error message do you get?
>>
>Yes, to others but not the LINUX LAN IP

Since you need to go *THROUGH* the Linux gateway to get to the
internet, this is the first problem that needs to be solved. Let's
concentrate on this one. I forgot to ask:
Can you ping the Linux box from the OSR5 machine by IP address?
My guess(tm) is that you cannot.

Since the W2K box can probably (not sure) ping the Linux box, I'll
assume that the Linux box is properly configured. More questions:

Is the Linux box and OSR5 box on the same Class C subnet?
Are the subnet masks the same on all machines? (i.e. 255.255.255.0)
You can display those on OSR5 with:
ifconfig -a
or perhaps:
ifconfig net0
The "ffffff00" means 255.255.255.0

The W2K box will show the IP's in a "CMD" window with:
ipconfig
or:
ipconfig -a

The unspecified Linux mutation box will probably use:
/sbin/ifconfig

Compare the numbers, Class C IP blocks, and netmasks.

>> Can you traceroute from oSR5 to any of the local machines by machine
>> name? If you can traceroute by IP, but not by machine name, check the
>> contents of /etc/hosts and /etc/resolv.conf for name lookup problems.
>
>Yes, but not the LINUX's machine name

That's understandable since you also cannot traceroute to the Linux
box by IP address. If the IP address does not work, the name will
also not work. Let's ignore the DNS (name service) issues for now and
do everything with IP addresses. Once that is working, we may be
lucky and have the DNS lookups working.

>> If both the above work, can you traceroute by IP address to any
>> machine on the internet? Pick one that actually returns ICMP packets.
>> If not, what error message do you get? If not, your Linux gateway is
>> doing something to the packets.
>
>No, so my linux is doing something to the package when the source IP
>is from the OSR5 only?

No. I don't think so. Since you cannot DIRECTLY ping the Linux box,
you cannot route to it, send packets through it, or expect anything to
be returned from a remote internet host. Concentrate on why the OSR5
box cannot traceroute (or possibly cannot ping) the Linux box.


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# Jeff Liebermann 150 Felker St #D Santa Cruz CA 95060
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