Subject: Re: Newbie questions
From: Peter M. Bagnall (peter_bagnall@yahoo.com)
Date: Sat Jun 16 2001 - 17:51:15 MDT
If I remember correctly ping is actually implemented
in the kernel, not as a daemon process. Some kernels
do not have it compiled in. You can test this by
trying to ping the machines IP address from itself. Or
even pinging 127.0.0.1.
The other possibility is that your ISP is not
forwarding ICMP packets, (which is what ping uses).
They tend to do this for security reasons. Again try
pinging the boxes own IP address. If that works but it
doesn't from a remote site suspect your ISP.
If you have a webserver running on that box try
connecting to it using the IP address you've found. I
now generally use HTTP to test network connections
because it's pretty much unheard of for a firewall to
block port 80 nowadays.
hope that helps
--- Carolyn Jean Fairman <cfairman@Stanford.EDU>
wrote:
> Mike,
>
> I understand the loopback address. I ran ifconfig
> (will make some
> login script to get this for me and set some env
> variable to it so it
> is easy to use). I can see the inet addr is the IP
> address so that
> makes sense and thanks!
>
> So why can't I ping that address once I telnet into
> somewhere else?
> Do you know what configuration I need? I assumed
> ping always worked
> and you would get so-and-so is alive if they didn't
> want to give out
> info. But the ping gets no response at all.
>
> --Carolyn
>
>
>
>
> When you connect out to the Internet, only one
> IP address (generally) of
> your machine will be accessible from the outside.
> Although it is correct
> that your machine will have multiple IP addresses
> some of them, like
> 127.0.0.1, are not eally "internet addresses".
> That one in particular is
> the address for the loopback connection (which
> allows you to open a
> connection to localhost even if you don't have a
> network). To find the IP
> address supplied by your ISP, you need to figure
> out what address is
> associated with your Ethernet card (alternatively
> the modem if you were
> dialing up). Sometimes this can be figured out
> from the name of your
> machine (aka adsl-xxx-xxx...), but you can always
> use the ifconfig command
> to get information on your network devices and
> pull the IP addres from
> there. Unfortunately, I'm not at a linux box at
> the moment so I can't tell
> you exactly which number it is - but I do know it
> is not the P-to-P
> number, and not the netmask. It will be a set of
> 4 numbers seperated by
> ".", just like a normal IP address. You may even
> recognize it as being
> similar to the name mentioned above
> (adsl-xxx--blahblah). Hope that helps
> :)
>
> Mike
>
>
>
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This archive was generated by hypermail 2a24 : Sat Jun 16 2001 - 16:56:44 MDT