Change modem router SBS 2011.

Hi there,
the office have switched from an adsl to cable broadband isp after a lot of downtime from the provider so i went to change the adsl router to a cable modem router today but none of the workstations could connect to the server or internet afterwards. The SBS 2011 connected to the internet fine but couldn't connect to any of the workstations either so i removed the cable router & put back the adsl router & all was fine again, or so i thought. The only issue i can see is that in the network & sharing center on the SBS it's connected to Network 4 not the domain but everything seems to be working ok for all the users.
To set up the new router i logged into it from a laptop & changed the lan ip address & subnet mask to the same as the old router, turned off DHCp & forwarded ports 80, 443, 110 & 25 to the SBS as was done on the old router.
Is there a procedure i should have followed that i didn't or where have i gone wrong?
When the workstations can't access the server they're ipconfig is still configured to the right settings.
I tried restarting the server & workstations but no joy.
On the worksattions i can still see the ADSL router in Network but can't release/renew the ipconfig.
All workstations are Win 7 clean installs.
The network is all wired.
Any help is much appreciated.
DahoeAsked:
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Muhammad BurhanManager I.T.Commented:
preseme that your router is responsible for DHCP.
Login to the router and verify that the clients get ips from it or not?
Do a ping test from any of the workstation to the router.
Check DNS settings of SBS, may be it supposed to forward dns queries to adsl's dns server
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DahoeAuthor Commented:
No, DHCP is disabled on the router.
All workstations have static ip adresses.
Workstations could ping the router but not the SBS.
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DahoeAuthor Commented:
I've solved the "in the network & sharing center on the SBS it's connected to Network 4 not the domain" issue by disabling & re-enabling ipv6 on the SBS NIC.
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CompProbSolvCommented:
If the workstation can ping the router, the workstation has the router as the default gateway, the modem/router is properly communicating with the internet, and the proper rules/routes/etc. are set up in the router then the workstations should be able to get to the internet through the router.

It would be helpful if you could post the results of the following from a workstation and from the server with the new modem/router installed:

start
run
cmd
ipconfig /all
ping 4.2.2.2
ping google.com
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DahoeAuthor Commented:
I did run ipconfig all & it gave me the correct results for IP address, DNS & default Gateway, which were the same on the old router.
It appears as if even though the old router was gone the workstations were still trying to connect to it. I tryed ipconfig release/renew but got an error mesage that the network card was not in a suitable state to complete the request, or something similiar to that.
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CompProbSolvCommented:
If the LAN IP address of the new router is the same as the old, the workstations should connect the same as before unless there is something tied to the MAC address.  What firewall are you running on the workstations?  I've seen them be tied to the router MAC address for internet access.

If the workstations have static IP addresses, then ipconfig /release or ipconfig /renew won't tell you a lot.
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DahoeAuthor Commented:
The workstations run Avast Endpoint Protection Suite Plus.
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Muhammad BurhanManager I.T.Commented:
Router ip should be the gateway for all of the network.
Please tell us about the DNS for SBS and the Workstations, how you handle dns queries..?
Verify also the netmask of the router's lan ip and Natting.
If any firewall is there, let us know
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CompProbSolvCommented:
You indicated that ipconfig gave you the correct results for IP address, gateway, and DNS.  I'm going to assume that the netmask was also correct.

If you are unsuccessful at pinging the internet by IP address then DNS is not the (only) issue.

I would bet that the Avast software is the issue.  Can you disable the firewall temporarily to confirm this?  I'm betting that it is tied to the MAC address on the router.
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DahoeAuthor Commented:
To Muhammad Burhan
The router ip is the def gateway for all users.
The SBS ip is the DNS & all ip add's are static.
Net Mask is the same on SBS, router & workstations.
Avast firwall is on workstations so i'll disabale it later & reconnect the new router.

To CompProbSolv
I'll be back in there later this morning so will uninstall Avast completely from one workstation & reconnect the new router to see if that is the problem, i think there might even be a laptop with just MSE on it that i could use.
I'll also ping google.com & 4.2.2.2 from it.

Anything else i might check if it still doesn't work?
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David AtkinTechnical DirectorCommented:
Hello,

When you've connected the new router run the 'Fix my Network Wizard' from the SBS Console. Confirm any warnings or errors.
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Cris HannaCommented:
Actually I would recommend running the connect to the Internet wizard.  This will allow rediscovery of settings, routing etc
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Muhammad BurhanManager I.T.Commented:
Have you verify DNS forwarders ..?
Every user have SBS ip as DNS, but what SBS should do when recieve dns queries. It should forward it to your isp DNS or to router.
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DahoeAuthor Commented:
It's not Avast, tried it with laptop with MSE installed.
Can ping 4.2.2.2 not google.com.
SBS sees the new Cisco router, workstations see the old ADSL router in Network Infrastructure.
Workstations can see SBS & other workstations, SBS only sees New Cisco router in Network.
Fix My Network errors:
No internet connection found
An Internet Port mapping is missing.
DNS is using a DNS forwarder.
Exchange SMTP connectors are invalid
A network component is not configured properly (Component ID 3)
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Cris HannaCommented:
Did you tell the Fix my Network Wizard to fix things?
I still recommend running the Connect to the Internet wizard on the main page of the SBS Console.
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CompProbSolvCommented:
"Can ping 4.2.2.2 not google.com".  This is significant!
The fact that you can ping 4.2.2.2 says that you have a connection to the internet that is working.
You didn't provide the output of pinging google.com but I'm betting that it said something to the effect that it could not find the host.  This says that name resolution is not working.  This should be a DNS issue.

As a test, set the primary DNS on a workstation to 4.2.2.2 and then ping google.com and try to browse the internet.  They should work.

Set the DNS back to what it was (did it point ONLY to the SBS?).  Then do the following and report the results:
start
run
cmd
nslookup
google.com
server 4.2.2.2
google.com
exit
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CompProbSolvCommented:
It would be useful to know about DNS settings on the SBS.  In particular, what does ipconfig /all give you for the server?  It should point only to itself for DNS.

Secondly, how is the DNS server configured?  Specifically, does it try to use the DNS from the previous ISP?  As a test, remove any forwarders and just use root hints.
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DahoeAuthor Commented:
I didn't tell the Fix my Network Wizard to fix everything as i've had it mess things up for me in the past.
I did run the Connect to the Internet wizard.

At the moment the old router is connected so i only have remote access, logmein, to the SBS & Client the way they are at the moment, working fine, so if there's any info i can get you from this setup let me know.
I'll pop in 2moro & connect up the new router again so should still have logmein access to the server as it has no problem connecting to the internet, don't think i'll have acccess to the client though.

The reply to pinging google.com i'm pretty sure was timed out.

I did copy the ipconfig /all results from both routers on both the Client & SBS to notepad so i'll upload them here.

Basically when i switch the routers the SBS recognises it but the clients still think they are connected to the old router. I wonder would setting them back to obtain ip & dns automatically before i switch the routers then adding the static ips, gateway & dns after would make it connect to the new router?
Client-Cisco-router-ipconfig.txt
Client-TP-Link-router-ipconfig.txt
SBS-Cisco-Router-Ipconfig.txt
SBS-TP-Link-Router-Ipconfig.txt
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DahoeAuthor Commented:
There are 5 forwarders:

8.8.8.8 google-public-dns-a google.com
***.***.**.** dns1 old ISP
***.***.**.** dns2 old isp
8.8.8.8.4 unable to resolve
our external ip mail. ourdaomain.com
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Muhammad BurhanManager I.T.Commented:
Remove all forwarders, restart dns server service then try
Giva a Try also with removing ipv6 adress from default gateway in sbs tp link config
Run dnslookup and try different recursive queries
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CompProbSolvCommented:
What are you observing that leads you to conclude "the clients still think they are connected to the old router"?

The actual results to ping google.com (when it fails) would be useful.  For example, what IP address did it use?
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Muhammad BurhanManager I.T.Commented:
all of the cliets have their own configuration (static).
They never know which router they are connected with, they have just network gateway which is correct.
Dns server of all clients points to your SBS which is also correct, now the thing which we are trying to figuring out that your SBS DNS server should respond to the clients by taking the response from internet.
First you have to ensure that your Sbs getting proper response from you isp in terms of DNS. To verify this start cmd, dnslookup wikipedia.org
It should resolve that with ips.
Now try this step on your client and see the response.
also please check the browser's settings for proxy etc
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DahoeAuthor Commented:
"What are you observing that leads you to conclude "the clients still think they are connected to the old router"?"
When i open Network on SBS i see the Cisco router under Network Infrastructure & no clients.
When i open it on the clients i see the ADSL TP-Link router, the SBS & all the clients. I can connect to the clients using usernames & passwords but not to the SBS.

I'll get the results later today when i get to the office for:
ping google.com
dnslookup wikipedia.org

And i'll check the browser's settings for proxy etc
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DahoeAuthor Commented:
ping google.com from client results in request timed out.

nslookup wikipedia.org from SBS with Cisco router results in:

 C:\Windows\system32>nslookup wikipedia.org
Server:  UnKnown
Address:  fe80::aef8:69e0:193e:ea43

Non-authoritative answer:
Name:    wikipedia.org
Addresses:  2620:0:862:ed1a::1
          91.198.174.192

nslookup wikipedia.org from SBS with TP-Link router results in:

C:\Windows\system32>nslookup wikipedia.org
Server:  UnKnown
Address:  fe80::aef8:69e0:193e:ea43

Non-authoritative answer:
Name:    wikipedia.org
Addresses:  2620:0:862:ed1a::1
          91.198.174.192
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DahoeAuthor Commented:
I have the new Cisco router connected now & i'm logged in remotely to it for the wkend. I can't access the client though.
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CompProbSolvCommented:
We need to determine if this is an issue with both IPv4 and IPv6.

From the client, run both of these:
ping -4 google.com
ping -6 google.com

Two things are important: Was the name resolved into a proper IP address?  Did the proper replies get back?
Another test would be to shut off IPv6 on a client and see what happens.

Also, it appears that reverse DNS for IPv6 is not working on your SBS, evidenced by "Server:  UnKnown".  While that shouldn't be causing the immediate problems, it should be fixed at some point.  Take a look at the Reverse Lookup Zones in the DNS server on the SBS and see that IPv6 is properly populated.
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Muhammad BurhanManager I.T.Commented:
uncheck that v6 IP in SBS DNS properties interfaces tab
and check again for lookup in SBS
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DahoeAuthor Commented:
"From the client, run both of these:
ping -4 google.com
ping -6 google.com
Two things are important: Was the name resolved into a proper IP address?  Did the proper replies get back?
Another test would be to shut off IPv6 on a client and see what happens."
I can't access the client at the moment just the SBS, connected to the new router.

"Reverse Lookup Zones in the DNS server on the SBS and see that IPv6 is properly populated. "
How exactly should i do this?

"uncheck that v6 IP in SBS DNS properties interfaces tab
and check again for lookup in SBS"
Do you mean turn off ipv6 in the Local Area Connection properties?
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DahoeAuthor Commented:
BTW when i try to ping the client i get destination host unreachable.
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DahoeAuthor Commented:
I'm going to ring the ISP in the morning & ask is this a common problem with they're routers as all is fine until it comes into the equation.
Thanks for all your help, it's much appreciated.
Any suggestions to continue with 2nite?
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Cris HannaCommented:
Still haven't run the connect to the Internet wizard, have you?
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DahoeAuthor Commented:
"Still haven't run the connect to the Internet wizard, have you? "

Yep, ran this but no difference.
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Cris HannaCommented:
can you post the Ipconfig /all from your server and the LAN config from your router and an Ipconfig /all from a workstation....please make sure to annotate which is which

Regarding IPv6   SBS really wants IPv6 UNLESS you turn it off the right way http://blogs.technet.com/b/sbs/archive/2008/10/24/issues-after-disabling-ipv6-on-your-nic-on-sbs-2008.aspx

If you have not already done so..and I don't recall seeing it, you should install the SBS BPA tool
Note that it must then be updated to version 1.5 before it's actually meaningful
https://www.microsoft.com/en-us/download/details.aspx?id=15556
http://www.sbslinks.com/sbsbpa.htm
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Muhammad BurhanManager I.T.Commented:
No, i just ask you for remove ipv6 adddress in dns listen interface so it didn't listen from ipv6 as your sbs is trying in dnslookup.
And please ensure that your new router supports IPv6
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DahoeAuthor Commented:
"can you post the Ipconfig /all from your server and the LAN config from your router and an Ipconfig /all from a workstation....please make sure to annotate which is which"
I did post Ipconfig /all from server & client both old & new router above.

I'll run the BPA tool later & post back any issues.

"No, i just ask you for remove ipv6 adddress in dns listen interface so it didn't listen from ipv6 as your sbs is trying in dnslookup"
How do i go about doing this?

Router does support ipv6.

The ISP suggest resetting the router & connecting it to the server before changing the LAN settings, port forwards etc. I'll have to try that tomorrow morning as i'm only connected remotely.
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CompProbSolvCommented:
What is the model # of the router?  The better routers allow you to restrict communication between the different LAN ports.  It is sounding as if the SBS and the workstation are on different physical ports on the router and that communication between them is being blocked.

Can you try connecting all LAN connections that presently connect to the router to a simple switch and then a run a single cable from the switch to the router?  This would be a good test of my concern above.
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DahoeAuthor Commented:
At the moment the router connects to an unmanaged switch and the SBS & that's all.
It works with the old router so don't see it as a problem.
To be honest, when i talked to the eventually escalated engineer in the ISP, he was adamant that this may have been a problem they fixed before so gonna go with them in the morning & post back after.
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DahoeAuthor Commented:
Also, thanks for all the help & advice It really is much appreciated.
Have the feeling this much be something simple so the router is the obvious choice.
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DahoeAuthor Commented:
Ok, so i went to the office today & reset the router as per the ISP's advice then connected it to the SBS & setup the LAN & port forwards & hey presto everything is now connected with internet access using the new router.
The fact that we now have a new external ip address i take it i'll have to get our hosting provider to point to this now?
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CompProbSolvCommented:
"the router connects to an unmanaged switch and the SBS": if you are saying that the SBS connects directly to the router and everything else connects to a switch (that then connects to the router), my comment about routing/access rules inside the router may be the issue.

For example, assume that the switch connects to port #1 on the router and SBS connects to port #2.  Consider what happens if the router does not allow communication between ports 1 and 2 but does allow either to connect to the WAN side.  SBS will have full internet access because it doesn't rely on any devices on the LAN other than itself and the router.  Workstations connected to the switch will be able to get to the internet by IP address.  Those workstations won't be able to get to the server because of the lack of connection between the two ports.  This will also keep the workstations from getting to the internet by name because they rely on SBS for DNS.

If you reset the router to factory defaults, it likely allowed all access between all ports, so your symptoms have gone away.

As far as the new external IP address goes, that is an issue if you are running a mail or web server internally or if you are doing some sort of remote access to your LAN.  The DNS tables need to be changed at your (likely two) authoritative DNS servers.
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DahoeAuthor Commented:
Only solution that worked.
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