Solved Why can't I ping computers on separates subnets?

May 21, 2012 at 07:52:27
Specs: Windows 7
Hello All,

My new employer has asked me to determine any issues that could be causing performance issues our LAN. The network has two subnets and one of the first things that I noticed is that I cannot ping computers on subnet A from subnet B. I've looked into this and found a few things.

-I CANNOT traceroute to computers on subnet B from subnet A

-I CAN NMAP to computers on subnet B from subnet A

-Computers on subnet A CAN ping other computers on subnet A and computers on subnet B CAN ping other computers on subnet B

-Computers on subnet A CAN ping and access servers on subnet B

I am relatively new to networking and not exactly sure where to start investigating this problem. Any help would be greatly appreciated. Thank you!


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#1
May 21, 2012 at 08:08:40
✔ Best Answer
Does not sound like a problem. Sound deliberate like vlans are being used for security/domain broadcast reasons.

I would suggest you diagram the network and do a full investigation of the configuration before deciding on any changes.

Answers are only as good as the information you provide.
How to properly post a question:
Sorry no tech support via PM's


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#2
May 21, 2012 at 08:26:26
Thanks for the advice! I have already started a network diagram, so I will work on finishing that before investigating this further.

On anther note, can you recommend a methodology for creating a network diagram and investigating configuration? My company has very little documentation. I am keeping track of information as it comes along, but now I am thinking that I should systematically create a fresh diagram.


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#3
May 21, 2012 at 08:27:19
Ping is also a poor test. It may be some router in the path. Might be some odd subnet issue.

Hang up and live.


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Related Solutions

#4
May 21, 2012 at 10:35:08
You create a plan that shows the physical connections between equipment
Then you create a logical plan that shows vlans and ip routes
You document each switches configuration.
You develop a ip plan and document that also.

Answers are only as good as the information you provide.
How to properly post a question:
Sorry no tech support via PM's


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#5
May 21, 2012 at 11:21:25
You'll have to excuse jefro. His networking skills range somewhere between useless and nonexistent. If I could force him to stay out of this forum I would so as to help prevent him from giving more stupid answers like the one above.

Ping is a perfectly good tool for checking on connectivity between computers.

As to a network diagram, I would start by diagraming out the network appliances and backbone connections between them. Then you could add servers.

There are a lot of different ways to do a diagram and I would suggest you google "example network diagram" and check some out, see what makes the most sense to you and will work best in your environment.

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
May 21, 2012 at 11:40:46
Thanks again, everyone.

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#7
May 21, 2012 at 11:44:41
I am always torn between deleting jefro's posts or leaving them.
Rule I follow is how confusing is his post. If its going to send the OP off on a useless tangent I delete the post. Otherwise I just ignore them.

Answers are only as good as the information you provide.
How to properly post a question:
Sorry no tech support via PM's


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#8
May 21, 2012 at 14:04:08
I thought I was the only one that thought that...

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#9
May 22, 2012 at 07:44:30
I pretty much delete his nonesense when I see it.

I keep hoping if I respond like I did here, he will see it and take it to heart and stay out of this forum. It's obvious to anybody who knows even a little about networking that he knows absolutely nothing.

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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