Hi,

Recently had a perculiar issue with clients on one of our customers networks that stopped being able to lookup names on the internal network, losing network drives, gpo etc as a result.

DHCP is served by windows server 2008 DC with DNS service also hosted on this with the relevant pointers to this set up in DHCP.

We ended up having to statically set the DC name in the HOSTS file until I looked at this onsite this morning, I noticed a nslookup was resolving the router as the dns service instead of the DC. Powering off the router and running the same nslookup and it resolved to the DC. DNS and DHCP were both disabled on the router.

I made a change to the Interface in DNS as it was set to 'Listen On All IP addresses' I changed this to 'Listen on specific IP' which was the IP of the DC(Itself). Flushed the cache on the clients, restarted them they got the gpo, drive mappings, and I could resolve the server by name.

However, a nslookup still resulted in the router name rather than the DC name, despite obviously being able to resolve hosts on the network.

I then disabled ipv6 on one of the clients nics and hey presto a nslookup resolved to the IP of the DC, if I re-enable ipv6 on the nic it reverts back to resolving the router.

My thoughts are that the client isn't able to resolve the DC by ipv6 so it is reverting to the server for some reason, perhaps because of forwarders/root hints set up in DNS.

They are up and running again but I have noticed …

First, If I am correct:
Standard Access-list  can match traffic based on Source IP address only
Extended Access-list can match traffic based on Source/Destination IP address , port number, protocol, etc...

well, there is also  Named Access-list. We can have Standard Named Access-list and Extended Named Access-list
  Is Standard Named Access-list similar to Standard Access-list, it can match traffic based on Source IP address only ?
Is Extended Named Access-list  similar to Extended  Access-list ,it can match traffic based on Source/Destination IP address , port number, protocol, etc. ?

Thank you

Hello Everyone!

We had some security cameras installed and the installer asked me to open port 8000 for the dvr.  We have a Sonicwall 1260 Pro and I followed the instructions for port forwarding.  I created the service for both TCP/UDP, port 8000 and then created the group.  I used the public server wizard to allow public access to the camera ip.  After everything was complete I used the site, http://www.yougetsignal.com/, to check if port 8000 was open.  Unfortunately, the port is still closed.  I'm stuck figuring what I could be doing wrong.  We do have 2 static ips for the site.  The other ip is used for the fax machine line.  i don't know if this could cause the problem.  Any help is appreciated.

Router: SonicWall 1260 Pro
ISP: Cox
WAN: 72.205.202.66
Camera IP: 192.168.168.62
Port: 8000
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We have an odd situation.

It's a hodgepodge network in a franchisor's location.

It's technically administered from head office on the other side of the country but they get me to do some of the work as I'm less annoying than the main IT.

Windows Server 2012 peer-to-peer system

#1. A windows 7 Professional station gave hard drive warnings (failure imminent) and infection notices
#2. Took station, cloned drive onto SSD
#3. autologon for computer was now erroring out. Had no idea what old password was, created new one with autologon in the registry
$4. Disinfected computer via Malwarebytes and installed Barkly endpoint
#5. Find out that the server is used to access 3 shared folders via peer to peer on the station and that it can't access the shares

At this point I figure that the issue is simply related to the password change, but no.

The server is unable to ping the station, either by name or by ip address. However, the station can ping the server by both name and ip address.

It looked to me as if DNS was incorrectly configured on the server (typo), so I fixed. (192.163.0.1 to 192.168.0.1)

#1. I've tried repair network on both.
#2. ipconfig /flushdns on both
#3. rebooted one or both after each or every other change
#4. turned off homegroup on station
#5. changed station network type from home to work
#6. created hosts file entry for station name to ip address
#7. tried to ping TCP/ip 6 address (no go)
#8. checked for saved credentials on the …

System: windows 10


After running windows update i can ping internal and external Ipaddress but kant access any internet pages or internal shares


- Checked Windows Firewall
- Disabled the firewall

No luck
Run the command Netsh

- Netsh int ip reset reset
- Netsh int tcp set heuristics disbled
- Netsh int tcp set global autotuninglevel=disabled
- Netsh int tcp set global rss=enabled

No luck

- Run the command Netsh

- Netsh winsock reset

No luck

- Ipconfig /release
- ipconfig /renew
- ipconfig /flushdns

no luck
Installed telnet and telnet the port neth 127.0.0.1 3389
commands successvol

issue still there any help or idees will be appreciated

When I connect vo my remote SQL Server  via Microsoft SQL Server Management Studio I get the error 121.

A Transport level error has occurred when receiving results from the server.

I'm at spain and my Internet provider is Movistar.

When I open Microsoft SQL Server Management Studio , I can Log on with my credentials, the connection is via SQL login, and the connection is like 000.000.000.000\Instancename,49888

49888 is the port I'm using.

I can connect to the same server throug other computers form other places with different Router.

If I connect a USB Internet stick to the problematic computer, then it Works fine, then I think is a router issue. But when I call to my internet provider (Movistar) they say that all the outgoing ports are open.

Any idea?

What is the importance of this message.
What should I be concerned about? Or When should I be concerned about this?

Determine Network Portion and Host portion of  IPV6 IP

Let' say I have this IPV6 IP address.

2001:1234:5678:1234:5678:ABCD:EF12:1234/64

in this case : 2001:1234:5678:1234  is the Network portion and 5678:ABCD:EF12:1234 is the host portion

that one is easy to find.
How about when the CIDR is for instance 53.
Example:


2001:1234:5678:1234:5678:ABCD:EF12:1234/53

Where is the Network portion and where is the host portion ? how do you calculate it ?

Thanks

I struggled with what to title this.  So, I have two routers, one at .85 that manages everything between .82 and .86, and one at .89 that manages just .89.  They exist in the same gateway of .81.  The .85 and .89 are tied to cable modems, so it is not something that I can just plug the one in to the other to get them to talk.  I have pfSense routers set up but I am wondering how I get the two networks to talk to each other instead of, what I am assuming, is them just looking within themselves for resolution.  I have AVG on computers in the .89 network that need to communicate with the server on the .85 through a particular port.  I can get computer on the Internet to communicate with the AVG server just fine, so I know that my port forwarding works, but I cannot get these two networks to communicate with each other.

I have noticed the Multicast Address used in the command:
IP IGMP Join-Group <IP Address>
sometimes it is 239.1.1.1 , sometimes 239.3.3.3 ,etc....
I would like to know how the IP address is determined.

Thank you

find the Exchange server name that Outlook is connected to.

on the Task bar I  have opened the splash window by clicking on the little Up-arrow on the far right side of the task bar, then I have pressed CTRL and right clicked on Outlook icon, then clicked on Connection Status.
Now I see the Outlook Connection Status, but under the server name, it does not show the readable server name, instead it shows: 595a9152-c607-45ca-a8ec-2ceb4282f988@mydomain.com

How do I convert that to readable server name or at least readable IP address ?

Thank you