I have ipmasq_icmp loaded as after the connection is completed, I can
ping the target system. The problem lies in the change from not dialed
up to dialed up.
In reference to the MS ping program, I was thinking the same thing you
were and wrote my own ping program. This program opens the socket,
sends a ping, closes the socket, and then reopens the socket again to
send the next ping. This also fails.
My next test was to set up a second linux box that would replace the MS
machine for this test and see if it operates in the same manner
Charles H. Deling
-----Original Message-----
From: Jason Morgan [SMTP:[EMAIL PROTECTED]]
Sent: Thursday, November 12, 1998 6:34 AM
To: [EMAIL PROTECTED]; [EMAIL PROTECTED]
Subject: Re: Strange ping results
If you are using IP masquerading, i.e. The windows machine has a
172.x.x.x 10.x.x.x 192.168.x.x address and you ISP is on the
'real'
internet then you have to have ipmasq_icmp loaded on Linux for
ping
to work from ms-windows (or any other machine on your local net)
> Subject: Re: Strange ping results
> From: <[EMAIL PROTECTED]>
> To: [EMAIL PROTECTED] (Deling, Charles)
> Date: Wed, 11 Nov 1998 21:33:18 +0000 (GMT)
> Cc: [EMAIL PROTECTED]
> Deling, Charles wrote:
> > I have set up several Windows machines connected to a Linux
box running
> > diald.
> >
> > If the Linux box has not dialed into the ISP, and I ping a
site on the
> > Internet (from the Linux box), ping will fail until the dial
up
> > connection is completed, then it will successfully start
pinging the
> > site. During this period, I will not stop and restart the
ping program,
> > I just let it run and it (after getting dialed up) starts
pinging the
> > target
> >
> > If the Linux box has not dialed into the ISP, and I ping a
site on the
> > Internet from one of the Windows machines, it will continue
to fail even
> > after the connection is made. The only way it will start to
succeed is
> > I stop the ping program and restart it. Then it will ping
the target
> > system.
> >
> > What gives????
>
> Very simple. Linux pingcan handle that the IP address
changed. MS ping
> can't. At least, I'm guessing this is your configuration.
>
> If your pings re-negotiated their connection each time, they'd
work, but
> since that'd be useful, and intelligent, and stuff, they
don't.
>
> Admittedly, I haven't played extensively with MS ping, and
only once did
> I mess with a diald setup with a remote linux box trying to
ping through
> the main machine. I can't remember for certain if I actually
tried ping
> in that case.
>
> > I am trying to use ping as part of a batch file to check and
see when
> > the connection has been made before starting a telnet
session.
>
> Does the ping command let you give a ping count? If so, you
can specify
> that, and run it in a loop until it works.
>
> Ed Grimm
>
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