>>>>> François TOURDE <fra...@tourde.org> writes:
>>>>> Le 15179ième jour après Epoch, Camaleón écrivait:
>>>>> On Sat, 23 Jul 2011 23:22:57 +0200, François TOURDE wrote:
>>> No route to host means: "I or some other router on the road can't find
>>> the hardware associated with the IP given, or the way to reach it".
>> "No route to host" is a generic message that you can get on very
>> different situations.
> "No route to host" is the consequence of receiving an ICMP "host
> unreachable" error. It means the ARP resolution failed for reaching
> the next hop.
… Or ICMP “host unreachable — admin prohibited filter”? See,
e. g., [1].
[1] https://bugzilla.redhat.com/show_bug.cgi?id=490854
>> For instance, when your ISP has smtp port of your DSL connection closed
>> and you try to establish a connection on port 25 via telnet with a remote
>> e-mail server, you get a "no route to host" message which basically means
>> that you cannot establish a connection with the selected computer on
>> choosen port but it does not invlove that computer you are trying to
>> reach is "off" or disconnected.
> When your ISP, like mine, is blocking the xx port, you should receive
> a "connection timed out" message.
> That's what I receive:
> francois@fermat:~$ telnet gmail.com 25
> Trying 209.85.147.17...
> telnet: Unable to connect to remote host: Connection timed out
> But perhaps you didn't receive the same error?
That's what happens when the packets are dropped, without any
ICMP message whatsoever. In iptables(8) terms, compare:
-A FORWARD -d 192.0.2.0/24 -p tcp -m tcp --dport 25 -j DROP
-A FORWARD -d 192.0.2.0/24 -p tcp -m tcp --dport 25 -j REJECT --reject-with
icmp-admin-prohibited
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