Is this a mistake or  am i  checking sth wrong , how should be a packet with missing checksum ?

0000   a0 36 9f 55 7c aa dc 38 e1 ac 9b 89 08 00 45 00  .6.U|..8......E.
0010   00 25 8b cb 00 00 fd 11 d7 aa 89 3c 5a 64 b9 b6  .%.........<Zd..
0020   bc fa fc 5d 69 87 00 11 00 00 ff ff ff ff 55 38  ...]i.........U8
0030   55 76 03 00 00 00 00 00 00 00 00 00              Uv..........

Select all Open in new window

My issue is two fold, why can I PING an IP of a device that isn't on the network and I can't print.

I have a Datamax label printer that I just created a device description for and assigned it a new IP address, this printer is plugged into a switch, the switch is plugged into a firewall that goes through to another firewall before it gets to the IBM i.  We have two partitions, PROD and TEST.  I copied the device description and out queue from TEST to PROD to ensure they were identical on both sides.  

This printer works perfectly in TEST.  When plugged into the network I am able to print to it, I can PING its IP, TELNET to it and the trace route returns the three expected entries.  When I vary off the device and unplug it from the network I cannot PING it from the IBM i nor the network, I cannot TELNET to it and the trace route only returns the two expected entries.  All as it should be.  

However, in PROD I am unable to print to the device.  When I release a spool file it goes right to RDY status and the writer gets error CPD337F .  I have verified that the port and IP are correct, I have verified that the remote device is not busy, I have verified that the printer is on line.  I can PING its IP from both the IBM i and the network but I cannot TELNET to it and the trace route returns only two of the three expected entries.  When I vary off the device and unplug it from the network I can still PING it from the IBM i but not from the network, I …

How to enable Mysql server access through TCP/IP
where mysql installed in Centos machine.,.I am trying to access using mysql workbench it through TCP/IP but throwing error .. attached screenshot.
Where as when I select TCP/IP over SSH .. I can able to connect .
mysql-TCPIP.jpg

What is the process to determine which company hosts an organization's external DNS MX records?

Here is a simple example of CIDR IP blocks
10.0.0.0/26
10.0.0.64/26
10.0.0.128/26
10.0.0.192/26

I would like to change them into
10.0.0.0/24

So from 4 IP blocks to change them into 1 IP block.

I know how to manually aggregate CIDR blocks, but I have over 5.000 IP blocks.

I’m looking for a tool that will automatically combine adjacent IP blocks into larger IP block.

I'm receiving this error among others, listed after. I have no idea why this error is coming up! how do I address?

Event 4879 MSDTC Client 2
MSDTC encountered an error (HR=0x80000171) while attempting to establish a secure connection with system SERVERNAME.

More errors that I don't understand and one that Microsoft doesn't even seem to know about (starting with that one)

The error that MS has no info on in Event ID Online help
Event 4230 TCP/IP has chosen to restrict the congestion window for several connections due to a network condition.  This could be related to a problem in the TCP global or supplemental configuration and will cause degraded throughput.

I am connected Biometric Attendance Machine to my system using the Ethernet cable. I assigned IP of the biometric machine and computer system.
When I am doing ping biometric machine I am getting error " Destination Host Unreachable "

I set upIP  of the machine is:
IP: 192.168.10.201
Subnet Mask: 255.255.255.0

Where as sytem IP
IP: 192.168.10.151
Subnet Mask : 255.255.255.0
Default Gateway : 192.168.10.1


I tried by USB connection too but getting failed to connect in ZKTECO BIOMETRIC Software.
System-IP-Configuration.png

I have a remote site with no local tech support. The gateway is a Fortigate firewall. Recently, when trying to sign in to edit firewall rules, I have started getting a logon prompt describing level 15 access and referencing an IOS certificate that cannot be verified. Sometimes it allows the https Fortinet web page login, and sometimes it produces the logon box- obviously a Cisco device. I have tried using an IP scanner but it doesn't allow to browse that IP (Advanced IP Scanner has a dropdown that allows you to see available resources at an IP, such as web pages and FTP sites), and I have not been able to connect via SSH (The only shell option I have is within the Fortigate web administration, and I can't get the page to load reliably for obvious reasons). This site is 3/4 of the way across the country so traveling there is out of the question. I cannot just re-IP the Fortigate for two reasons: I can't get it to save changes, and I can't take down the plant's production gateway from across the country without any kind of guarantee that I'll be able to rescue the device or limit downtime. My goal is to identify the Cisco device, possibly by obtaining the serial number so I can find out who owns it and have them correct it's IP address. I'll welcome any advice as to how to get to that point... Anyone? I appreciate your help.

I need to know the difference between :

Access-List 100 permit .....
IP Access-list extended 100.  
  ip access-list extended name

if I have forgotten other access-list types , please list and explain it :)

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
img.png

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 …

What is the difference between Internet Protocol (TCP/IP) Enabled or Industrial standard (modbus, profibus, etc) enabled communications with HVAC systems for the data center?