Re: How to ping a router behind two routers ?

Tech-Archive recommends: Repair Windows Errors & Optimize Windows Performance

From: Roland Hall (nobody_at_nowhere)
Date: 06/18/04


Date: Fri, 18 Jun 2004 10:31:50 -0500


"Sam Mok" <sam_ys@163.net> wrote in message
news:%236W9GkIVEHA.716@TK2MSFTNGP11.phx.gbl...
: Dear Roland ,
:
: Do you mean that I can't ping 192.168.0.1~254 from 10.144.9.1~254 in our
: company's settings ?

No, I have no way of knowing that. I said if ICMP echo requests are being
denied, you'll never get a response. PING and TRACERT can be denied a
response if ICMP echo requests are disabled on the router.

If your WAN setup is:

net1 -[router]- net2 -[router]- net3

and you can ping from any host on net2 to net3 but not from net1 to net2 or
net3 then perhaps the router between net1 and net2 is blocking ICMP echo
requests.

-- 
Roland Hall
/* This information is distributed in the hope that it will be useful, but
without any warranty; without even the implied warranty of merchantability
or fitness for a particular purpose. */
Online Support for IT Professionals -
http://support.microsoft.com/servicedesks/technet/default.asp?fr=0&sd=tech
How-to: Windows 2000 DNS:
http://support.microsoft.com/default.aspx?scid=kb;EN-US;308201
FAQ W2K/2K3 DNS:
http://support.microsoft.com/default.aspx?scid=kb;EN-US;291382


Relevant Pages

  • TCP checksum failure with offloading disabled (0xFFFF)
    ... an issue with the TCP stack in Vista? ... ICMP Echo (ping) request ...
    (microsoft.public.win32.programmer.networks)
  • Re: TCP checksum failure with offloading disabled (0xFFFF)
    ... Sounds like an issue with Vista stack or an issue with filtering software ... ICMP Echo (ping) request ...
    (microsoft.public.win32.programmer.networks)
  • RE: ICMP (Ping)
    ... I do like your reasoning that others do not generally have a business need ... to ping your hosts, however I still prefer to allow this service not simply ... how many hosts do not respond to ICMP echo. ... DHCP server should be able to assume that if the IP were in use a host would ...
    (Security-Basics)
  • RE: ICMP (Ping)
    ... Should ICMP echo requests be dropped? ... Responding to the requests tells script ... Subject: ICMP (Ping) ...
    (Security-Basics)
  • Asymmetric ping mystery, using GreenBow/Linksys VPN
    ... The IPSec VPN tunnel opens as expected between the client PC and the ... and it can ping other nodes on the ... Protocol Info ... ICMP Echo request ...
    (microsoft.public.windowsxp.network_web)