Traceroute request getting timed out

Dell / Poweredge r210
June 17, 2014 at 02:05:11
Specs: Suse enterprise desktop, corei3/4Gb
We have a server connected to a 3g router at our office. The router has a sim card connection through a static ip (We'll call it B). We also have a another static ip assigned to our main router which is the gateway to the internet connection to our office.(we'll call it A) When I do a traceroute
from the main IP (A) to the 3g router (B) it reaches the destination after several hops. However when the same trace route is done from the 3g router (B) to the main ip (A) it gets lost after hops upto 30. Why is that. can you advise

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#1
June 17, 2014 at 07:25:54
If I'm understanding your post, you have two routers in your LAN, when you attempt to traceroute between them, you end up with multiple hops either way. When you traceroute from A to B it responds, but when going from B to A, the traceroute times out.

I have to wonder why you have more than one hop. Unless you have multiple L2/L3 network appliances between the two routers, your traceroute should only return a single hop.

Regardless, A may not be replying to B's traceroute if you have a firewall rule on A preventing it. Check router A and see that it's allowing a response to the traceroute.

It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.

***William Henley***


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#2
June 17, 2014 at 10:42:05
I was trying to simplify a very complicated network issue. The network is a very complex one and we do not have a good network administrator to run it. So let me rephrased the problem a little bit further.the router B is connected to a dmz zone server.( so this server has a lan connection and it is connected to the router with a static ip) The router A is our main gateway router which our office is connecting to the internet with.(The router B is also connected to the internet although no one is using internet through that gateway and it is in a DMZ zone) our main network is on a lan which is different from the DMZ zone and it does have a software firewall however several investigations into the firewall rules by our IT department found nothing is blocking the router B.

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#3
June 17, 2014 at 14:00:40
Ok, this is a rather convoluted setup and there's not likely to be a lot I can do (without more intimate knowledge of your LAN) to help but I will try.

From the sounds of it with the one router in the DMZ, both routers are connecting to the other via the internet (thus the multiple hops between....if they're communicating via the LAN, then there should only be 1 or maybe as many as 2 hops between). Are they supposed to be connected on the LAN side as well?

The other thing I'm curious about is, are the two routers doing the job they're intended to do?

If they are working properly, and they're not intended to connect via the LAN, then I fail to understand why it's even an issue that one isn't responding to a traceroute from the other. Perhaps you could explain a little more what it is you're attempting to do/ascertain by doing the traceroute between the two.

It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.

***William Henley***


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Related Solutions

#4
June 17, 2014 at 23:47:07
The router B is in the DMZ with a server connected to it in a one ip range 10.30....etc
The router holds a 3G sim with a static ip. The router A is our main router which sits outside the firewall. It is the gateway through which we are accessing the internet. All our workstation computers are connected to a LAN with an ip range 192.168....all of which are sitting behind the firewall. This local LAN should have a direct connection with the DMZ since there are some processes running for the system.

The reason why we did the trace route between two routers via the internet is for troubleshooting purposes. There are some devices outside our office which are calling on to the Router B through the static IP which would receive the data and send it to the connected server in the DMZ zone which is then forward to another server(not in DMZ) in the lan network for processing.

I know this is a sort of a complex network. That's why I tried to start from a simple point and expand the problem. Thank you for trying to help me out here.


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#5
June 18, 2014 at 07:22:32
Your setup is a little complex but nothing insurmountable.

I guess the big question is, are the two routers functioning as they should be?

If they are, and everything that connects to them can do what they need to do, then there really isn't a problem other than one is not responding to traceroute.

The next question I have is, did router A respond to traceroute's before?

It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.

***William Henley***


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#6
June 19, 2014 at 00:50:49
As far as we know and investigate upto now the routers are configured correctly. However while investigating we came across an interesting finding. The traceroute from router B which is in the DMZ to router A though the internet the traceroute time out only when the Router B is connected to a linux machine (this server runs Suse Linux enterprise desktop) if the router is connected to a windows machine the traceroute completes without problems (meaning traceroute from router B to A and A to B completes)We temporarily connect the Router B to a windows machine to check.

message edited by chami


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#7
June 19, 2014 at 07:08:19
That is strange behavior.

On the plus side, other than the traceroute issue it sounds like your equipment is all working properly. So in that sense, you don't really have a serious problem. Just a "nag" issue.

I can't imagine why it would make a difference what the OS of the connected server is since the traceroute should be running from router to router, not from the server.

I've never encountered anything like this in my travels and have no idea how to help you with it. But, I am VERY curious now so if you ever do figure it out, please come back and respond in this thread again so I can see.

It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.

***William Henley***


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