I was thinking that may be the case, but I wasn't at all sure.<br>Thank you.<br>-Bill<br><br><div class="gmail_quote">On Thu, Mar 3, 2011 at 2:35 PM, Michael Mol <span dir="ltr"><<a href="mailto:mikemol@gmail.com">mikemol@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">"Destination Host Unreachable" is an ICMP response for IP packets when<br>
a router can't find a way to get the packet nearer to its destination.<br>
<br>
These response packets may be filtered out by some network's<br>
firewalls, in which case you might not hear anything back. If the<br>
packet is passed on to the next router, and the next router never sees<br>
it (or glitches in some other way), you may not hear anything back. If<br>
the packet reaches the target host, but the target host is configured<br>
to not send ICMP ECHO replies, you won't hear anything back.<br>
<br>
I've also dealt with at least one system where the firewall was<br>
configured to send an ICMP destination host unreachable response in<br>
the case of a filtered port, rather than sending RST or silently<br>
dropping the packet. _That_ one was puzzling.<br>
<div><div></div><div class="h5"><br>
On Thu, Mar 3, 2011 at 2:29 PM, Bill Littlejohn <<a href="mailto:billl@mtd-inc.com">billl@mtd-inc.com</a>> wrote:<br>
> When I ping some non-existent IP addresses I get Destination Host<br>
> Unreachable, and some others return nothing.<br>
> What's actually the difference?<br>
><br>
> billl@MTD-IT-ADM2:~$ ping 192.168.1.113<br>
> PING 192.168.1.113 (192.168.1.113) 56(84) bytes of data.<br>
> From 192.168.1.210 icmp_seq=2 Destination Host Unreachable<br>
> From 192.168.1.210 icmp_seq=3 Destination Host Unreachable<br>
> From 192.168.1.210 icmp_seq=4 Destination Host Unreachable<br>
> From 192.168.1.210 icmp_seq=5 Destination Host Unreachable<br>
> From 192.168.1.210 icmp_seq=6 Destination Host Unreachable<br>
> From 192.168.1.210 icmp_seq=7 Destination Host Unreachable<br>
> ^C<br>
> --- 192.168.1.113 ping statistics ---<br>
> 8 packets transmitted, 0 received, +6 errors, 100% packet loss, time 7017ms<br>
> , pipe 3<br>
> billl@MTD-IT-ADM2:~$ ping 192.168.1.7<br>
> PING 192.168.1.7 (192.168.1.7) 56(84) bytes of data.<br>
> ^C<br>
> --- 192.168.1.7 ping statistics ---<br>
> 17 packets transmitted, 0 received, 100% packet loss, time 15999ms<br>
><br>
><br>
><br>
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