Ping an IP address with and without a firewall

From: Tosca (no-spam_at_thank-you.com)
Date: 11/07/04 

Date: Sun, 7 Nov 2004 17:05:04 -0000

Hello everyone

A friend and I each have XP Pro and connect to ADSL. He connects with a
cable and I connect wirelessly. I have a firewall in the router as well as
ZoneAlarm on my laptop. He uses the built-in firewall.

We tried pinging each other's IP address and the response that he got was
that it was timed out and all of the packets were lost. That it what I
expected but, when I looked at the router's and ZoneAlarm's logs, they
didn't report anything unusual. Should anything have been reported?

When I pinged his IP address, the none of the packets were lost. I
contacted him and he told me that his firewall was off (!). He turned it on
and I tried again - with the same result.

I was under the impression that the firewall would reject such things. Is
this correct? What am I missing? Is my understanding of IP addresses and
firewalls flawed? Should he be pleased that my ping attempts got through or
should I be pleased that none of his got through? Does either of us have a
problem with the firewall?

Thanks for your time and patience.

Relevant Pages

  • Re: Ping an IP address with and without a firewall
    ... >When I pinged his IP address, the none of the packets were lost. ... >I was under the impression that the firewall would reject such things. ... permitted - probably incoming echo request (ie ping) is checked as ...
    (microsoft.public.windowsxp.general)
  • MAC address changed while using machine on net?????
    ... stuff on the interwebnet I suddenly lost my connection to the lan on ... Stopped the SuSE Firewall and all was returned back to normal, ... How the devil can Suse change the MAC on my nic while it is in use, ... this also had lost its settings and video was missing. ...
    (alt.os.linux.suse)
  • Re: MAC address changed while using machine on net?????
    ... > Stopped the SuSE Firewall and all was returned back to normal, ... this also had lost its settings and video was missing. ... Interesting that you noticed the connection between the firewall and your ...
    (alt.os.linux.suse)
  • weird MAC address change on the fly?
    ... Stopped the SuSE Firewall and all was returned back to normal, ... How the devil can Suse change the MAC on my nic while it is in use, ... this also had lost its settings and video was missing. ...
    (comp.os.linux.hardware)
  • Re: All tcp ports open?
    ... I've lost the original post so I don't have all of the details that I ... That being said...dollars to donuts...Raptor firewall. ... report all TCP and UDP ports as open and jam up automated scans but you ...
    (Pen-Test)