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SBS 2008 Server Can't Connect to Internet via IP or Name

I have a very strange problem and hope someone has seen this before.  We have a SBS 2008 server running on citrix xen server.  We had shut power down last week because of Hurricane Issac.  After turning server back on, we are having random internet outages from the system.  For example, I can't resolve google.com nor can I ping any routable ip address on the internet, 8.8.8.8 .  I've verified router/firewall, all client computers can route out if i use the isp dns as a secondary. What is really strange is that during random intervals during the day, it works for a few minutes then drops out. In my dns server on the sbs, my forward addresses will not resolve as well.  I have spent 2 days trying to resolve this and have had no luck.  I've replace firewall and switch as well.  Not sure if there is something within sbs that would be causing this.  I'm not an sbs expert.  I have ran the newtwork config wizard, etc, etc.  This is also my exchange server and because of this issue, no mail is getting routed to the server.  Any ideas?

Thanks in advance..
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ryanropp
Asked:
ryanropp
3 Solutions
 
databoksCommented:
Hi.

Just for clarification:

1. Your clients can make DNS lookups when they use the Secondary DNS - Correct?
2. What is your settings on the Ethernet on the server(Static, DHCP?).
3. Can you pint your gateway when there is no connection?


Thanks.
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ryanroppAuthor Commented:
1.  yes
2. static
3.  yes
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databoksCommented:
What happens when you add the secondary DNS server on the Ethernet NIC?

Have you used Wireshark before?
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ryanroppAuthor Commented:
still can't ping by ip or name with my isp's dns as secondary.  I can understand not being able to by name because of dns, but can't for the life of me figure out why not by ip.

I've never used wireshark before.
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marcustechCommented:
On the problem server, what is the output of netstat -rn ?  Also the output of ipconfig /all ?
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ryanroppAuthor Commented:
I went ahead and removed and reinstalled the citrix virtual adapter to see if it helped and it did not.  See below:

netstat -rn:

 12 ...12 74 67 59 62 34 ...... Citrix XenServer PV Ethernet Adapter
  1 ........................... Software Loopback Interface 1
 13 ...00 00 00 00 00 00 00 e0  isatap.{43BBE123-542C-46D9-B0AD-EFE646488910
 10 ...02 00 54 55 4e 01 ...... Teredo Tunneling Pseudo-Interface
===========================================================================

IPv4 Route Table
===========================================================================
Active Routes:
Network Destination        Netmask          Gateway       Interface  Metric
          0.0.0.0          0.0.0.0      192.168.1.1    192.168.1.225    261
        127.0.0.0        255.0.0.0         On-link         127.0.0.1    306
        127.0.0.1  255.255.255.255         On-link         127.0.0.1    306
  127.255.255.255  255.255.255.255         On-link         127.0.0.1    306
      192.168.1.0    255.255.255.0         On-link     192.168.1.225    261
    192.168.1.225  255.255.255.255         On-link     192.168.1.225    261
    192.168.1.255  255.255.255.255         On-link     192.168.1.225    261
        224.0.0.0        240.0.0.0         On-link         127.0.0.1    306
        224.0.0.0        240.0.0.0         On-link     192.168.1.225    261
  255.255.255.255  255.255.255.255         On-link         127.0.0.1    306
  255.255.255.255  255.255.255.255         On-link     192.168.1.225    261
===========================================================================
Persistent Routes:
  Network Address          Netmask  Gateway Address  Metric
          0.0.0.0          0.0.0.0      192.168.1.1       5
          0.0.0.0          0.0.0.0      192.168.1.1  Default
===========================================================================

IPv6 Route Table
===========================================================================
Active Routes:
 If Metric Network Destination      Gateway
  1    306 ::1/128                  On-link
 12    261 fe80::/64                On-link
 12    261 fe80::298e:15aa:e000:921f/128
                                    On-link
 12    261 fe80::b61e:982b:91ab:7f68/128
                                    On-link
  1    306 ff00::/8                 On-link
 12    261 ff00::/8                 On-link
===========================================================================
Persistent Routes:
  None

Ipconfig /all

Windows IP Configuration

   Host Name . . . . . . . . . . . . : DTL-SBS01
   Primary Dns Suffix  . . . . . . . : datatel.local
   Node Type . . . . . . . . . . . . : Broadcast
   IP Routing Enabled. . . . . . . . : No
   WINS Proxy Enabled. . . . . . . . : No
   DNS Suffix Search List. . . . . . : datatel.local

Ethernet adapter Local Area Connection:

   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Citrix XenServer PV Ethernet Adapter
   Physical Address. . . . . . . . . : 12-74-67-59-62-34
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
   Link-local IPv6 Address . . . . . : fe80::298e:15aa:e000:921f%12(Preferred)
   Link-local IPv6 Address . . . . . : fe80::b61e:982b:91ab:7f68%12(Preferred)
   IPv4 Address. . . . . . . . . . . : 192.168.1.225(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . : 192.168.1.1
   DHCPv6 IAID . . . . . . . . . . . : 252867687
   DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-12-EC-91-20-12-74-67-59-62-

   DNS Servers . . . . . . . . . . . : 192.168.1.225
   NetBIOS over Tcpip. . . . . . . . : Enabled

Tunnel adapter Local Area Connection* 8:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : isatap.{43BBE123-542C-46D9-B0AD-EFE6464
910}
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes

Tunnel adapter Local Area Connection* 9:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
   Physical Address. . . . . . . . . : 02-00-54-55-4E-01
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
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ryanroppAuthor Commented:
Problem resolved.  Seems there was a device conflicting somewhere on the network.  Changing the ip fixed the issue. Thanks to the 2 posters for the help.
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Rob WilliamsCommented:
.
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ryanroppAuthor Commented:
Figured out it was a device conflict.
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