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SBS 2003 , cannot ping default gateway ?

Posted on 2008-06-25
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Last Modified: 2010-04-21
hi all
let me start by apologising , i am a Telelcoms engineer by trade but now inherited looking after our sbs 2003 server. i had a few niggles but reading lot of posts , sorted all barr 1 !!!
i have installed SBS best practices analyzer & now it reports everything running fine with the exception it & i cannot ping the default gateway ?
internet access works fine , SMTP mail running fine, Outlook web access & RDP again fine.
details:
default gateway is : 192.168.1.1
2 x NIC's
1 - local connection - 192.168.1.71
2 - internet connection - 192.168.1.70

any suggestions on where to start would be great ... thanks !!!!
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Question by:MOSTIN01
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Expert Comment

by:Rob Williams
ID: 21864566
Make sure only the internet connection is the only one assigned a gateway, i.e. the internal/local NIC should have its gateway blanc.

However I am surprised everything is working. The internal and external IP addressing should be using different subnets such as 192.168.1.x  and  2192.168.2.x
If you make any changes the LAN addressing has to be changed using the "change server wizard" and after changing the WAN/external, you must run the CEICW (Configure e-mail and internet connection wizard) called "connect to the Internet". Both are located under server management | Internet and e-mail.

See:
How to configure Internet access in Windows Small Business Server 2003
http://support.microsoft.com/kb/825763

If you are not familiar with SB, it is very important to use the wizards. The following would be well worth reviewing:
Introduction to Windows Small Business Server for Enterprise IT Pros
http://download.microsoft.com/download/b/6/d/b6d49479-be81-4f4a-86ce-21d634bca514/SBSITPRO.doc


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by:MOSTIN01
ID: 21865166
thanks for the reply
as you can imagine i am nervous in changing the server IP etc ...
what about changing the subnet on the router to 192.168.2.1 ? then they would be seperate as you say ...
thanks
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by:Rob Williams
ID: 21865257
>>"as you can imagine i am nervous in changing the server IP"
quite understand.

If you change the router you have to change the external IP of the server. It may be set to auto, which is fine, but probably requires a reboot to accept. If you have any incoming services such as Exchange, Outlook Web Access, VPN's, Remote Web Workplace and such as, there will be rules in the router to forward those services to the SBS. They would also have to be changed to point to the new IP.

If you have to change one, change the WAN/Internet one. Although everyone can loose internet, there are less complications. I never recommend changing the Internal/Local unless you absolutely have to, and if you do, you MUST use the "change server IP" wizard for that. It affects a lot of services and can 'break' the server.

The issue is the SBS is acting as a router. Routers decide on where to send packets based on the subnet (network segment) to which they belong. If the external and internal are the same, where does it send the packet?
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by:MOSTIN01
ID: 21866065
hi
here's what i did
i re-ran the internet wizard to see what the setting where , i saw it was set with local router with IP address & later on the IP of the device was specified.
i saw that if i changed to direct broadband connection & enabled DCHP on the router a IP would be spcified.
i did all this & it was assigned 192.168.1.64 from the router to the inernet NIC , i changed the firewall rules to point all services to this & all went well. but then everything stopped !!! :(
i rebooted the server & all is working again ( re-ran the internet setup & enabled the firewall with mail etc allowed )
i can ping all the NIC's on the server 64 - internet , 71 - LAN . but still cannot ping 192.168.1.1 ???
could it be DNS ??

thanks
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Expert Comment

by:Rob Williams
ID: 21866183
Pinging an IP is not dependent on DNS.
As mentioned, likely when you ping it is sent to the LAN adapter because it also uses the 192.168.1.x subnet, and it cannot find it on the LAN. Also make sure the LAN adapter does not have a gateway address specified in the NIC configuration.
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by:MOSTIN01
ID: 21866318
doh !!
sorry about the DNS question !!!! i realise it was a silly statement after re-reading ...
LAN NIC does not have the gateway specified ?
in this enviroment what configuration would you suggest ? router - Internet NIC - LAN NIC ?
i am alot happier using the wizard & i can see from other posts , a restart is best after this ...
thanks for you advise !!!
cheers
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Expert Comment

by:Rob Williams
ID: 21866388
Sorry I missed something earlier. You say you cannot ping the default gateway but Internet access works fine?
If so that may juts be a function of the router. Many commercial routers do not allow ICMP requests (ping replies) from the LAN, almost all refuse from the Internet. This is a configurable option but could be switched off.
Can you access the router (default gateway) using browser and the IP?
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by:MOSTIN01
ID: 21866541
just tried , no i cannot access ...
i do have a machine connected directly to the router & checked all the settings...
it is a Linksys WAG354G , i have ordered a Draytek 2800 at the suggestion of our ISP ( i want to use it for VPN auth etc )
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by:MOSTIN01
ID: 21866789
after reading my comment  below
" in this enviroment what configuration would you suggest ? router - Internet NIC - LAN NIC ? "
what i was asking was what IP settings would you suggest
thanks
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Expert Comment

by:Rob Williams
ID: 21866960
I would leave the LAN alone, change the router IP to something less common such as 192.168.10.254, then Change the server's WAN NIC IP to 192.168.10.10 (don't touch the LAN/local NIC), and re-run the CEICW. As mentioned if there are incoming services, the router's port forwarding will have to be changed to point to the new 192.168.10.10 address.
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Expert Comment

by:Fmatias
ID: 21867334
Can you ping the router from any other computer( behind the SBS)
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by:MOSTIN01
ID: 21867585

robwill : i'll do this tomorrow , if i mess up tonight i will end up being hanged  !!! :)

Fmatias: no , thats the really odd thing , as you can see from the dialogue above ... everything works text book but i cannot ping the default gateway ????

i'll keep you posted ...thanks
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by:MOSTIN01
ID: 21873098
hi all
well it now working ????? i thought i had better retrace to make sure i had covered everthing ( which i had ) & i can now ping the gateway ...
after reading many posts it "appears" sbs is a bit of a law unto itself :)
we have a new server on the horizon so i think there will be some time well spent in reading some deployment papers first !!
thanks for all you help
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Accepted Solution

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Rob Williams earned 125 total points
ID: 21873944
4 guidelines with SBS
-use the wizards
-install all components whether you plan to use them or not
-choose defaults whenever possible
-use the wizards :-)
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Author Closing Comment

by:MOSTIN01
ID: 31470493
thanks for all your help & Patience with a telecoms man !!!!
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