Re: Ping an IP address with and without a firewall

Tech-Archive recommends: Fix windows errors by optimizing your registry

From: Peter Hutchison (pjhutch_at_NOSPAM.com)
Date: 11/07/04 

Date: Sun, 07 Nov 2004 17:49:25 +0000

On Sun, 7 Nov 2004 17:05:04 -0000, "Tosca" <no-spam@thank-you.com>
wrote:

>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.
>

If there is more than one firewall, then ICMP events such as Pings
could be blocked at any point. So check the router and wireless
settings again.

Peter Hutchison

Relevant Pages

  • Re: Cant ping, cant see home network
    ... >other was wireless w/o sp2. ... >I had shut off Windows Firewall on the one with sp2. ... >And still, I can ping the wireless, but the wireless can ping the ...
    (microsoft.public.windowsxp.network_web)
  • RE: Wireless access
    ... Well, How about setting your wireless in a complete DMZ off the Firewall, ... and only HTTP traffic can flow out to the internet and nothing else. ... to facilitate one-on-one interaction with one of our expert instructors. ...
    (Security-Basics)
  • Re: problem pinging between PCes connected to Linksys WRT54GS router
    ... Check if the Windoze XP SP2 firewall or 3rd party firewall ... It's on the bottom of the Wireless ... >Use ping to do all your testing. ...
    (alt.internet.wireless)
  • Re: router/firewall, wireless gateway recommendation for home user
    ... NAT will reduce all of the direct attacks unless you ... firewall appliance for under $100. ... to your wireless nodes, and to protect all internal hosts via NAT, you ... device to reduce direct attacks (additional security layer). ...
    (Security-Basics)
  • Re: Need Help with D-link DI-524 and Setting up File Sharing
    ... Hi Jeff- the Pentium 2 is wired, The P4 is wireless ... >6Mbits/sec is typical for a 10baseT-HDX connection. ... >>2) I understand that the router acts as a firewall. ... A software firewall on the ...
    (alt.internet.wireless)