Re: ICMP Questions

There are a lot of assumptions there, but generally, I'd say you are right.
The switches don't matter one bit. SO if router 2 knows that the network it
is looking for is on the interface connected to router 3, and that interface
is down, it should return "destination host unreachable".

"Shakey" <Shakey@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:188610E7-CCA2-4B5E-BBBC-D7EA54679142@xxxxxxxxxxxxxxxx
> Thanks Robert,
>
> I shall look at the links you mentioned.
>
> What would happen if you have following setup.
>
> Workstation (a) --->SW1------>R1 -----> Sw2------>R2---->SW3----> R3--->
> SW4----> Workstation (b). If the link is broken at R2----->SW3. When you
> ping
> workstation b from a, what reply message should you get back.
>
> I think "Reply from [router interface IP address] - Destination host
> unreachable". Is this correct?
>
> I do not have any routers and they cost too!!!
>
> Many thanks for your reply.
>
> Regards,
> Sultan
>
> "Robert L [MS-MVP]" wrote:
>
>> These links may help
>>
>> routing issues on vpn
>> TTL expired in transit and Destination host unreachable ... From the
>> server, you
>> receive "Destination host unreachable" when ping outside IP. ...
>> www.chicagotech.net/routingissuesonvpn.htm
>>
>> troubleshooting ping issues
>> Host is unreachable Ping lists a public IP instead of private IP ...
>> Reply from
>> 209.165.105.129: Destination net unreachable. ...
>> www.chicagotech.net/troubleshootingping.htm
>>
>> routing issues on vpn
>> TTL expired in transit and Destination host unreachable ... You receive
>> Time out
>> or "Reply from xxxx: TTL expired in transit" when ping the server from
>> ....
>> www.chicagotech.net/routingissuesonvpn.htm
>>
>> troubleshooting ping issues
>> Hardware Error Host is unreachable Ping lists a public IP instead of
>> private IP
>> Receiving a reply from a different IP TTL expired in transit ...
>> www.chicagotech.net/troubleshootingping.htm
>>
>>
>> Bob Lin, MS-MVP, MCSE & CNE
>> Networking, Internet, Routing, VPN Troubleshooting on
>> http://www.ChicagoTech.net
>> How to Setup Windows, Network, VPN & Remote Access on
>> http://www.HowToNetworking.com
>>
>> "Bob I" <birelan@xxxxxxxxx> wrote in message
>> news:uqu%23wCc9FHA.2696@xxxxxxxxxxxxxxxxxxxxxxx
>> Homework?
>>
>> Shakey wrote:
>>
>> > Hi, when you ping a remote host, if following message received, what
>> they
>> > mean and what may be the causes or problems?
>> >
>> > "Requested timed out"
>> > "Destination host unreachable"
>> > "Reply from w.x.y.z - Destination host unreachable"
>> > "Reply from w.x.y.z - TTL expired in transit"
>> >
>> > Many thanks
>> > Sultan
>> >
>>


.

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