Slow pings between Servers on LAN

itrmat · 10-22-2009, 07:45 PM

Hello,

We have 4 Servers running Windows 2008. After they were built, our WAN provider told us we needed to conform to a certain IP Schema so we had to change the IP addresses of our servers. We chose to rebuild the Domain Controller and a member server. (We rebuilt this from scratch re-installing the Operating systems with new IPs.) We added the two servers we chose not to rebuild into the new DC domain. Everything seems fine except..

Pings between rebuilt servers is <1ms
Pings to/from old (non-rebuilt) servers is like 30-40ms.

The servers are on the same switch locally...?
I used Ping - a to elimate DNS problems I believe..
Any ideas as to what may have went wrong?

Thanks in advance

matt261102 · 10-22-2009, 08:39 PM

I think you actually want a smaller time. Those milliseconds represent how long the round trip of the ping took. The shorter the better.
Have you noticed and delays or speed issues with your network?

itrmat · 10-22-2009, 10:51 PM

Sorry if my post was confusing but yes I'm expecting everything local to be less than 3ms so the servers I chose not to rebuild appear to have a problem. We are actually in the process of commissioning a new network and I am debating whether I should rebuild the other two servers before I fully install software, etc. At the moment those ping times don't seem to be effecting anything, everything seems to be working as expected but we have not added any clients. I am concerned that when I do that this problem will have a significant impact on the networks performance as a whole....

clyde123 · 10-23-2009, 06:48 AM

Just a guess, because you said "our WAN provider told us we needed to conform to a certain IP Schema "
Could it be that the old servers are on external IP numbers, and the new (or rebuilt) servers are using internal IP numbers ?

**bilbus** · 10-23-2009, 10:17 AM

what ip range are the new servers and the old ones?

itrmat · 10-24-2009, 08:38 PM

Thanks for the replys... They are all in the same range 10.89.24.X or similar
We had been using good old 192.168.0.X but we have changed the IP's on all 4 servers to match this.

IT-Tech · 10-24-2009, 10:45 PM

Hi!

There is one thing that I cannot seem to grasp and it is probably irrelevant to the issue, but why would your ISP require you to change your IP scheme?

Whether you are using a Class C network or a Class A network should not matter to your provider. Your firewall or router will have it’s own PUBLIC IP and what sits behind it is actually irrelevant and really none of your ISP’s business. I might be able to understand it if you are connected to a VLAN thru your ISP and they require it for their VLAN segments. It almost sounds like you are relying on them for your routing and you do not have any type of router or router/firewall in place.

That said, onto the problem at hand – slow response times.

Let me get all the information straight; you moved your network from a Class A to a Class C configuration. I.e. 192.xx to a 10.xx?

The two systems that your rebuilt are running fine and the two systems that you did not rebuild are the ones having the slow response times? All of the systems are Windows 2008 servers?

What type of switch are you using?

What type of router do you have in place?

What are your response times from the 2 servers that are slow to an outside address compared to the 2 servers that are working properly?

Can you provide the NIC configurations for all of your servers? Or at least verify the settings for them all and that they are all configured correctly & uniform.

Have you tried connecting the 2 servers that are slow into different ports on the switch to eliminate a switch port issue?

I’ll have a bunch more questions once I get more information on what switch(es) and router(s) you are using.

Sorry for all the questions and for some reason the ISP making you change your network class just keeps running thru my head; I guess because if my ISP tried that it would be a MAJOR nightmare for me! LOL

Thanks!

10-22-2009, 07:45 PM	#1 (permalink)
itrmat Registered User Join Date: Oct 2009 Posts: 3 OS: Windows	Slow pings between Servers on LAN Hello, We have 4 Servers running Windows 2008. After they were built, our WAN provider told us we needed to conform to a certain IP Schema so we had to change the IP addresses of our servers. We chose to rebuild the Domain Controller and a member server. (We rebuilt this from scratch re-installing the Operating systems with new IPs.) We added the two servers we chose not to rebuild into the new DC domain. Everything seems fine except.. Pings between rebuilt servers is <1ms Pings to/from old (non-rebuilt) servers is like 30-40ms. The servers are on the same switch locally...? I used Ping - a to elimate DNS problems I believe.. Any ideas as to what may have went wrong? Thanks in advance

10-22-2009, 08:39 PM	#2 (permalink)
matt261102 Registered User Join Date: Jun 2008 Location: Melbourne, Australia Posts: 155 OS: XP, Vista, Server2003, Fedora	Re: Slow pings between Servers on LAN I think you actually want a smaller time. Those milliseconds represent how long the round trip of the ping took. The shorter the better. Have you noticed and delays or speed issues with your network?

10-22-2009, 10:51 PM	#3 (permalink)
itrmat Registered User Join Date: Oct 2009 Posts: 3 OS: Windows	Re: Slow pings between Servers on LAN Sorry if my post was confusing but yes I'm expecting everything local to be less than 3ms so the servers I chose not to rebuild appear to have a problem. We are actually in the process of commissioning a new network and I am debating whether I should rebuild the other two servers before I fully install software, etc. At the moment those ping times don't seem to be effecting anything, everything seems to be working as expected but we have not added any clients. I am concerned that when I do that this problem will have a significant impact on the networks performance as a whole....

10-23-2009, 06:48 AM	#4 (permalink)
clyde123 Registered User Join Date: Apr 2008 Location: Glasgow Posts: 398 OS: xp sp2	Re: Slow pings between Servers on LAN Just a guess, because you said "our WAN provider told us we needed to conform to a certain IP Schema " Could it be that the old servers are on external IP numbers, and the new (or rebuilt) servers are using internal IP numbers ?

10-23-2009, 10:17 AM	#5 (permalink)
bilbus TSF Enthusiast Join Date: Aug 2006 Posts: 949 OS: OS2 Warp	Re: Slow pings between Servers on LAN what ip range are the new servers and the old ones?

10-24-2009, 08:38 PM	#6 (permalink)
itrmat Registered User Join Date: Oct 2009 Posts: 3 OS: Windows	Re: Slow pings between Servers on LAN Thanks for the replys... They are all in the same range 10.89.24.X or similar We had been using good old 192.168.0.X but we have changed the IP's on all 4 servers to match this.

10-24-2009, 10:45 PM	#7 (permalink)
IT-Tech Tech Hardware Team Join Date: Oct 2009 Location: Indiana Posts: 248 OS: All Microsoft Operating Systems My System	Re: Slow pings between Servers on LAN Hi! There is one thing that I cannot seem to grasp and it is probably irrelevant to the issue, but why would your ISP require you to change your IP scheme? Whether you are using a Class C network or a Class A network should not matter to your provider. Your firewall or router will have it’s own PUBLIC IP and what sits behind it is actually irrelevant and really none of your ISP’s business. I might be able to understand it if you are connected to a VLAN thru your ISP and they require it for their VLAN segments. It almost sounds like you are relying on them for your routing and you do not have any type of router or router/firewall in place. That said, onto the problem at hand – slow response times. Let me get all the information straight; you moved your network from a Class A to a Class C configuration. I.e. 192.xx to a 10.xx? The two systems that your rebuilt are running fine and the two systems that you did not rebuild are the ones having the slow response times? All of the systems are Windows 2008 servers? What type of switch are you using? What type of router do you have in place? What are your response times from the 2 servers that are slow to an outside address compared to the 2 servers that are working properly? Can you provide the NIC configurations for all of your servers? Or at least verify the settings for them all and that they are all configured correctly & uniform. Have you tried connecting the 2 servers that are slow into different ports on the switch to eliminate a switch port issue? I’ll have a bunch more questions once I get more information on what switch(es) and router(s) you are using. Sorry for all the questions and for some reason the ISP making you change your network class just keeps running thru my head; I guess because if my ISP tried that it would be a MAJOR nightmare for me! LOL Thanks!