02-21-2014 08:49 PM - edited 03-07-2019 06:21 PM
Hi Everyone,
I was tracing a IP from my PC.
Here is setup 172.31.250.19
|
Site A -----PC---SW1--SW2----Tunnel 1 to ------------Site2---SW1------Tunnel 2 -------------Site 3-----Router1-----Router2-------------IP 172.21.100.20
|
172.31.22.254
Where My PC is at Site 1
I am tracing IP of Router 1
Tracert shows it is 3 hops away
Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.
U:\>tracert 172.20.100.21
Tracing route to 172.21.100.20 over a maximum of 30 hops
1 5 ms 14 ms 6 ms 172.31.22.254--------------------------------IP of SW1 at site 1
2 <1 ms <1 ms <1 ms 172.31.250.19----------------IP of Sw2 at site 1
3 67 ms 67 ms 68 ms 172.21.100.20-------------------------IP of SW1 at sie 2
Trace complete.
U:\>
i know that if traffic goes via single tunnel it does not show hops in between.
So does that mean that even if we have 3 or more tunnels in between source and destination IP tracert will show it as only 1 hop away?
as we have seen here that from SW2 at site 1 it is only 1 hop away?
Regards
Mahesh
Message was edited by: mahesh parmar
Solved! Go to Solution.
02-22-2014 08:11 AM
Reza
In the original post Mahesh gives us this
172.21.100.20-------------------------IP of SW1 at sie 2
Mahesh
I do not understand your response. This time you are doing tracert 172.21.100.20, which is not quite the same as the tracert in your original post. And to 172.21.100.20 I believe that 3 hops is indeed the correct behavior.
HTH
Rick
02-22-2014 08:55 AM
Mahesh
What about this line from your original post
3 67 ms 67 ms 68 ms 172.21.100.20-------------------------IP of SW1 at sie 2
HTH
Rick
[edit] I think it would help if you would give us the diagram of this again and put IP addresses in the diagram for each of the device interfaces.
Also I realize that I have been assuming that the switches that you mention were operating as layer 3 routing devices. If the switch connected to R2 is actually a layer 2 switch then what you are seeing might be the correct behavior. So some more information about how things are configured would be helpful.
02-22-2014 10:16 AM
Hi Mahesh,
So you have a tunnel-1 (router) to tunnel-2 (router) to tunnel-3 (router)?
Are the end points for each tunnel a router?
Can you add IPs to your diagram?
It maybe you enter tunnel-1 and then right into the second tunnel and out
can you clarify?
Reza
02-22-2014 05:25 AM
Mahesh
I would say that this is not normal. If there are multiple tunnels then there should be a hop for each of the tunnels. I am a bit confused about your traceroute. I see that you entered this command
tracert 172.20.100.21
but then your PC says this
Tracing route to 172.21.100.20
and sure enough when it get to 172.21.100.20 the trace says complete.
So I believe that the issue is not about tunnels but is about what happened in your PC.
HTH
Rick
02-22-2014 07:06 AM
Hi Rick,
These tunnels 1 and 2 are running over the ISP WAN links.
Here is new tracert from my pc
Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.
U:\>tracert 172.21.100.20
Tracing route to 172.21.100.20 over a maximum of 30 hops
1 5 ms 14 ms 6 ms 172.31.22.254
2 <1 ms <1 ms <1 ms 172.31.250.19
3 67 ms 67 ms 68 ms 172.21.100.20
Trace complete.
Now the tracert shows going to right IP.
Still it only shows 3 hops
Regards
Mahesh
02-22-2014 07:39 AM
Hi Mahesh,
In your diagram, what device has IP 172.21.100.20
Thanks,
Reza
02-22-2014 08:11 AM
Reza
In the original post Mahesh gives us this
172.21.100.20-------------------------IP of SW1 at sie 2
Mahesh
I do not understand your response. This time you are doing tracert 172.21.100.20, which is not quite the same as the tracert in your original post. And to 172.21.100.20 I believe that 3 hops is indeed the correct behavior.
HTH
Rick
02-22-2014 08:53 AM
Hi Rick,
Let me fix my mistake.
Sorry for confusing you.
Here is correct info.
Seems yesterday i worked long hours.
U:\>tracert 172.21.100.20
Tracing route to 172.21.100.20 over a maximum of 30 hops
1 5 ms 14 ms 6 ms 172.31.22.254----------IP of SW1 at site 1
2 <1 ms <1 ms <1 ms 172.31.250.19---------IP of SW2 at site 1
3 67 ms 67 ms 68 ms 172.21.100.20--------------------------IP of Router 2 Site 3
Seems this is correct behaviour of traceroute now right?
Regards
Mahesh
02-22-2014 11:44 AM
MAny thanks Rick for providing your inputs into this.
Best Regards
Mahesh
02-22-2014 08:49 AM
Hi Reza,
172.21.100.20 is IP of R2
Regards
Mahesh
02-22-2014 08:55 AM
Mahesh
What about this line from your original post
3 67 ms 67 ms 68 ms 172.21.100.20-------------------------IP of SW1 at sie 2
HTH
Rick
[edit] I think it would help if you would give us the diagram of this again and put IP addresses in the diagram for each of the device interfaces.
Also I realize that I have been assuming that the switches that you mention were operating as layer 3 routing devices. If the switch connected to R2 is actually a layer 2 switch then what you are seeing might be the correct behavior. So some more information about how things are configured would be helpful.
02-22-2014 09:00 AM
Seems that was mistake Rick.
I should have typed there Site 3 ----Router2.
That was typo
Regards
Mahesh
02-22-2014 10:16 AM
Hi Mahesh,
So you have a tunnel-1 (router) to tunnel-2 (router) to tunnel-3 (router)?
Are the end points for each tunnel a router?
Can you add IPs to your diagram?
It maybe you enter tunnel-1 and then right into the second tunnel and out
can you clarify?
Reza
02-22-2014 11:36 AM
Hi REza,
End points of tunnels are routers
Yes i enter tunnel 1 then right into tunnel 2 that correct.
I put the ips to diagram in original post.
Regards
MAhesh
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