On Fri, 27 Jun 2008 03:28:56 -0700, David Schwartz passed an empty day by
writing:

> On Jun 27, 2:08Â*am, Max <nom...@4me.nl> wrote:
>
>> I would try another cable.
>>
>> --
>> Max
>
> You think a cable can tell the difference between a ping and a ping
> reply?!
>
> DS

when the xmit is on one pair and the receive is on the other, there is a
logic in the thinking - but I can't say how it reflects in reality.

--
begin oefixed_in_2005.exe

esrom wrote:
> I have Centos and XP installed on separate machines and connected
> using a crossover cable.
> I configured the network cards of both machines with static IP
> addresses.
> I have disabled the firewalls on both machines.
>
> The problem is:
> I can ping the Centos machine from the XP machine. However, when I try
> to ping XP from Centos, the ping request arrives at the XP machine but
> no reply arrives back at the Centos machine.
>
> I would appreciate some help with this.

If you can ping Centos from the XP machine, then your cabling and IP
routing is OK. Your XP machine is probably configured somewhere not to
respond to pings; there is no doubt a way of changing the configuration
but I don't know that much about them.

Robert

On Fri, 27 Jun 2008 14:56:19 +0100, Robert Harris passed an empty day by
writing:

> esrom wrote:
>> I have Centos and XP installed on separate machines and connected using
>> a crossover cable.
>> I configured the network cards of both machines with static IP
>> addresses.
>> I have disabled the firewalls on both machines.
>>
>> The problem is:
>> I can ping the Centos machine from the XP machine. However, when I try
>> to ping XP from Centos, the ping request arrives at the XP machine but
>> no reply arrives back at the Centos machine.
>>
>> I would appreciate some help with this.
>
> If you can ping Centos from the XP machine, then your cabling and IP
> routing is OK. Your XP machine is probably configured somewhere not to
> respond to pings; there is no doubt a way of changing the configuration
> but I don't know that much about them.
>
> Robert

You are 100% sure that you have either disabled the built in windows
firewall that most people forget about (part of the 'security centre') or
set it to allow ICMP (echo requests)?

If you run a command prompt on the XP box and ping 127.0.0.1 do you get a
response?

just in case:
http://www.duxcw.com/faq/win/xp/firewall.htm

--
begin oefixed_in_2005.exe

On Jun 27, 4:56*pm, Robert Harris <robert.f.har...@blueyonder.co.uk>
wrote:
> esrom wrote:
> > I have Centos and XP installed on separate machines and connected
> > using a crossover cable.
> > I configured the network cards of both machines with static IP
> > addresses.
> > I have disabled the firewalls on both machines.
>
> > The problem is:
> > I can ping the Centos machine from the XP machine. However, when I try
> > to ping XP from Centos, the ping request arrives at the XP machine but
> > no reply arrives back at the Centos machine.
>
> > I would appreciate some help with this.
>
> If you can ping Centos from the XP machine, then your cabling and IP
> routing is OK. Your XP machine is probably configured somewhere not to
> respond to pings; there is no doubt a way of changing the configuration
> but I don't know that much about them.
>
> Robert

Thanks to all of you for the replies. I finally discovered what the
problem was. The Checkpoint VPN software on the XP machine was
blocking ICMP requests. Even when I disabled the VPN it still
continued blocking the ICMP's. I couldn't find any configuration
settings to change this. Uninstalling the VPN solved the problem.