TCP/IP

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Transmission Control Protocol/Internet Protocol (TCP/IP) is the set of networking protocols that define end-to-end connectivity specifying how data should be packeted, addressed, transmitted, routed and received at the destination. This functionality is organized into four abstraction layers which are used to sort all related protocols according to the scope of networking involved.

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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
0
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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
0
In the example below, which wildcard mask will cover  the 4 subnets only
192.168.146.0
192.168.147.0
192.168.148.0
192.168.149.0

I though 0.0.7.255 is correct, but it will cover more than those 4 subnets.

Any wildcard mask calculator link, will be helpful.


Thanks
0
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?
0
Hello all,
our HTTP packets go via a proxy, unlike the rest of the TCP/IP packets.
so using ping to measure the latency between us and a webserver won't be very accurate. we need to measure latency over HTTP instead of ICMP.
any help ?
0
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
0
Hi,
Our school network has the following:
Sonicwall NSA 250 M Router (acts as gateway and also handles a separate VLAN)
Network address  192.168.1.0 / 24 (subnet mask 255.255.255.0)
Single DC running Server 2016 std (ip 192.168.1.50), handling DNS and DHCP
About 150 endpoints

We're in danger of running out of IPs, so I'm hoping there's a way we can change just the subnet mask and retain the 192.168.1.1 - 192.168.1.254 range while gaining an extra range of IPs on the same, new subnet (for example 192.168.2.x, or .0.x) .  I'm also hoping that changing the subnet mask (but not the IP) of the DC will not cause problems. I know I'll have to reconfigure the subnet mask on any non-dhcp devices (such as network printers and the server).

So I've a couple of questions. What's the best way of doing this?  
Which subnet mask would yield what ranges of IPs?  
Is changing the subnet likely to cause any issues for the server (which I envisage keeping on the same IP?

Thanks in advance.
1
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?
0
I'm taking over a new network and the IP scheme is set up as 10.10.x.x/8. I want to change it to a/23. Can I do this within my DHCP and on my router without any changes to my printers and dusktop?
0
What is the importance of this message.
What should I be concerned about? Or When should I be concerned about this?
errr
0
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I have a url with
financeuat.testarea.njcccrt:8888
what does the 8888 represent?
0
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
0
Hi

I have an application that needs to connect to a third party server on HTTPS.

App server > Bluecoat device > Firewall > Third party server

Our Bluecoat team are saying they want to block application HTTPS connections because they can't scan them. Note browser traffic uses a different proxy. So we are going to configure our service to use HTTP.

Is there a way to have this converted to HTTPS?
0
We have two sites, SiteA and SiteB....the network latency between them is about 15ms.

We want to run an application in both sites, but the vendor supports only 10ms latency between the two sites.

Is there anything we can do to reduce the latency?
0
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.
0
Hi

i have a Zultys Zip 57i phone that a user is having a problem with working from home.  It says no network available,

how do i get this phone to work on a home network ?
0
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
0
I decided to buy a pair of Powerline adapters to increase the speed from my modem/router to my PC and my PS4. So i connected one to my router and another one to my PC. Powerline's lights are fine and accordingly, I get green in everything and the middle one, which I assume is like the 'data being sent/received' one, just blinks occasionally (but always green). I've been googling all day and still haven't solved it so I'll just quick resume it:

- LAN connection from router to PC with ethernet cable works perfect
- No problems with WiFi
- Powerline connection to PC gets 'Unidentified network'
- ipconfig /renew doesn't work because i get this message "An error occurred while renewing interface Ethernet : unable to contact your DHCP server. Request has timed out"
- Manually inserting IP and etc. didn't solve it but it could be me (not an expert with internet settings)
- Restarting router and PC doesn't work
- Drivers updated

Here goes my latest 'ipconfig /all':

C:\WINDOWS\system32>ipconfig /all

Windows IP Configuration

   Host Name . . . . . . . . . . . . : AndrePC
   Primary Dns Suffix  . . . . . . . :
   Node Type . . . . . . . . . . . . : Hybrid
   IP Routing Enabled. . . . . . . . : No
   WINS Proxy Enabled. . . . . . . . : No
   DNS Suffix Search List. . . . . . : home

Ethernet adapter Ligação de Área Local:

   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Realtek PCIe FE Family Controller
   Physical Address. . …
0
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
0
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PAN Monitor - note the application is incomplete alsoI have some clients who are failing to access a server via SSL. On the PAN firewall the reason for the end of all sessions is TCP-RST-from-server. The clients that success get tcp-rst-from-client - several before later getting from server. Is there a way at the remote Windows server to troubleshoot why it would be sending TCP resets?
0
Any Expert to clarify what the Access List below does ?

R1(config)#access-list 106 permit ip 0.0.0.0 255.255.255.255 255.255.255.192 0.0.0.63  
R1(config)#router bgp 1
R1(config-router)#distribute-list 106 in

Thank you
0
Hi,

We use a small, locally installed SQL Server database on a Windows 7 Pro machine.
We use simple Excel apps that connect to the DB within the local network (that I coded years ago), and I'm trying to convert those apps now to Google Sheets, which would require TCP/IP access.

Unfortunately, the company that initially created the database (and now passively "manages" it and controls the "sa" user) is refusing to enable TCP/IP access unless I pay them a fortune to do it and then "manage" that access for me.

I'm already in the process of switching this database over to a cloud-based platform, but it's going to take a while, and we need to get Sheets supports for these reports sooner than later.

I have full control of the network, but not the database. Is there a way for me to connect remotely to [something], that then connects locally to the DB, so I can run SQL queries remotely?

(I'm a reasonably proficiently coder, but a paint-by-numbers admin. If  someone could point me in a direction by posting if it's possible, and through which tools, Google and I could take it from there.)
0
Understanding Extended-Access List

The Access list below  uses the following arguments:
The Subnet: 172.16.0.0
Wild Card Mask: 0.0.0.0
Subnet Mask: 255.255.255.0
then again :
Wild Card Mask 0.0.0.0




R1(config)#access-list 100 permit ip 172.16.0.0   0.0.0.0   255.255.255.0   0.0.0.0


R1(config)#router bgp 1
R1(config-router)#distribute-list 100 in

Any Expert to clarify why we use all those arguments? and what they mean ?

Thank you
0
Hi

I have an application that runs on ServerA that needs to make a connection to ServerB.

Both are Windows 2012 Servers.

I had a couple of questions

1. If ServerB was hard down, is there a  standard TCP timeout that applications utilise to confirm this

2. If ServerB was up, but the network path to ServerB was down, is this the same as situation A

3. If ServerB was up, but the network path to B was down, is the TCP response the same?
0
EE,

I have a few servers that I can't RDP into unless it's by IP Address despite the same name and correct DNS records.

Every one also happens to have two Nics where the top binding Nic is on a non routable network. I'm not sure if this is required for clustering or what they have going on but could this cause an issue and could flipping them disrupt any configurations from third party or Microsoft clustering applications?

Thanks in advance
0

TCP/IP

11K

Solutions

5

Articles & Videos

17K

Contributors

Transmission Control Protocol/Internet Protocol (TCP/IP) is the set of networking protocols that define end-to-end connectivity specifying how data should be packeted, addressed, transmitted, routed and received at the destination. This functionality is organized into four abstraction layers which are used to sort all related protocols according to the scope of networking involved.