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Networking Protocols

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The collection of articles, videos, and posts on this topic.

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Networking software modules are interfaced with a framework implemented on the machine's operating system that implements the networking functionality of the operating system. The best known frameworks are the TCP/IP model and the OSI model. Systems typically do not use a single protocol to handle a transmission. Instead they use a set of cooperating protocols, sometimes called a protocol family or protocol suite.[9] Some of the best known protocol suites include: IPX/SPX, X.25, AX.25, AppleTalk and TCP/IP. Other protocols indirectly related to networking include the hypertext transfer protocol (HTTP) and its related technologies, Dynamic Host Configuration Protocol (DHCP), Domain Name Server (DNS) and other Internet protocols.

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Regedit \ RouterManager can be configured ?

Regedit \ TCPip6 every modified would be return to previous state, as motherboard changed, DUID mac info inside needed to , RFC3315 required .

When the OEM vga driver latest supported driver updated to Nov. 2018, whatever way tried, the computer Driver Manager can not see the latest date of the offering ?
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5 Comments
Learn SQL Server Core 2016
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Learn SQL Server Core 2016

This course will introduce you to SQL Server Core 2016, as well as teach you about SSMS, data tools, installation, server configuration, using Management Studio, and writing and executing queries.

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What's the best way to setup Cisco 3850 switches by copying configs over the new one. 2 identicals are already in place.  
The additional will server same functions as access switches.
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2 Comments
I have a wireless guest network and I'd like to test to make sure that it cannot get into my 10.10.0.0/16 internal network. Excluding ping sweep utility, what other tools can I use to do some sort of penetration testing? Thanks
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4 Comments
Meaning of Port number in Show spanning Tree

in the output of the command below  I see:

 Port        1 (Ethernet0/0)

I wonder what Port 1 means?  I thought the port is the same as interface.

Thank you


SW1#sh spanning-tree  vlan 20

VLAN0020
  Spanning tree enabled protocol ieee
  Root ID    Priority    24596
             Address     aabb.cc00.0400
             Cost        200
             Port        1 (Ethernet0/0)
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

  Bridge ID  Priority    32788  (priority 32768 sys-id-ext 20)
             Address     aabb.cc00.0100
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec
             Aging Time 300

Interface           Role Sts Cost      Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Et0/0               Root FWD 100       128.1    Shr 
Et0/1               Altn BLK 100       128.2    Shr 

SW1#

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4 Comments
How STP influence the Traffic

on the diagram below, PC2 is connected to  Switch SW3 that has a blocked port on the link to SW1. Now Traffic from PC2 to PC1 will it go from SW3 to SW2 then to SW1 or it stiil can go straight from SW3 to SW1 then to PC1

Thank you
stp
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8 Comments
Please see the below in asr1000 trying to establish bgp neighbor. Do we have to use address-family ipv4? Thank you

router bgp 22
 bgp log-neighbor-changes
 neighbor 55.66.77.8 remote-as 33
 !
 address-family ipv4
  neighbor 55.66.77.8 activate
  neighbor 55.66.77.8 soft-reconfiguration inbound
  neighbor 55.66.77.8 prefix-list ine in
  neighbor 55.66.77.8 prefix-list out out
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2 Comments
DR(designated router) is for sending source message to receiver. I am not sure DR is located between source and RP, or between RP to receiver? Anyone can give some idea? Thank you
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5 Comments
Hi, i have problem whith download Decrypting Cryakl from https://www.experts-exchange.com/articles/31579/Decrypting-Cryakl-1-4-0-0-1-4-1-0-FAIRYTAIL-Ransomware.html  (and decryptors.blogspot.com). Can help me whith download application?
I want test on CL 1.5.1.0. I have one pc whith this encryptor. I know that he was installed through the RDP, and have some files and log's. Maybe you decryptor can help.
It will then be possible to transfer the information to others.

Thank you.
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2 Comments
What if only get an gateway IPv6 is fe80:: by ISP modem connected when, it offering dhcpv6 acclaimed ?


ISP using an Enterprise Type of DHCPv6 service for some clients only , would be resumed or reasonable for the "unknown companies" associated with my ethernets mac address in the ipv6 addresses ?



Sincerely

BleuOisou
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4 Comments
Interface Multilink Vs Interface Virtual Template on Cisco Routers

I would like to know the difference between using the commands :
Interface Multilink Vs Interface Virtual Template

it looks like they achieve the same thing.

Any idea ?

Thank you
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6 Comments
C++ 11 Fundamentals
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C++ 11 Fundamentals

This course will introduce you to C++ 11 and teach you about syntax fundamentals.

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Dear Experts

We have the application server ( CRM system web-based ) running on windows 2012 R2 which is deployed on premises behind the firewall. we have to configure CRM application to send mails to the customers through office365 email account hence network team has provided access only to smtp.office365.com and on port 587 and denied rest of the outbound or inbound access i,e no http or https access to this system.  
1. The CRM application is not able to send mails when the http/https is disabled for this system.   Through the CRM workflows we are able to send the mails out only when the http and https is allowed to this system at firewall .
2.  we are not able to convince the network team as they say we allowed outbound smtp.office365.com and 587 the issue would be at application side, they are asking explanation on why http/ https required,
can you please help me to understand on what all ports or access to be enabled at firewall for this system/server in additional to smtp.office365.com and port 587 in case of  INBOUND and OUTBOUND so that we can communicate to the network team please.
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29 Comments
I want to check my network and see if certain ports and protocols are already allowed through the firewall, is there a windows  tool that I can use to verify this before I poke on the firewall?

Thank you,
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5 Comments
I have cisco catalyst 4507R-E that has to be replaced with below:
1. New Cisco catalyst 9407R switch with 2 supervisor modules, 1 24 sfp+ port module and 1 48 1Gig UPOE ports.

What are the recommended steps or the best way to migrate from 4507R-E to 9407R.
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0 Comments
Port 5083 : Qpur File Protocol
Can somebody tell me for what purpose is this service used for?
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2 Comments
Can someone explain to me where consensus algorithms fit within the TCP/IP model?  Let use Raft as an example.  Does it use multicast?  Does it use it's own transport number or TCP/UDP?  Does it live on the application layer?

Thanks
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2 Comments
Up to now, we have been running a fairly large peer-to-peer network of almost 100% Windows 10 Pro workstations with ONLY IPv4 enabled on the workstation NICs.  (There are 3 interconnected subnets with no name service shared between them).  Disabling IPv6 was done historically because using IPv6 in addition to IPv4 caused problems.  

Yet, more often now, Experts advise enabling IPv6.  Going along seemed perhaps a good idea.  And, in the sense of "if it ain't broke don't fix it", the hoped-for fix was to fix the Network list of computers in each distinct subnet - which has become more flaky/unreliable.  The experience with this was mixed as not all computers were switched to IPv6; i.e. not all subnets' workstations had IPv6 enabled.

We have since solved the Network computer name list problem.  So, there's a decision to make:
- "if it ain't broke, don't fix it" says to leave only IPv4 enabled.
- Expert advice says to also enable IPv6.  

It surely appears that "IPV6" in Windows is NOT simply an addressing scheme but also carries with it other things - things which I'm unable to list, but one hopes.

I have not had any trouble that I know of in enabling IPv6.  Yet, when one of the senior folks enables it on his own workstation, the network connectivity dies.  This problem survives a reboot and, yes, IPv4 remains enabled.

I believe it's bad practice to have a mix of settings in a network.  So if someone can suggest a fix to the network connectivity problem…
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15 Comments
when I do a pptp VPN from my network over an ATT router I get this error only on my windows 10 devices (1 desktop and 2 laptops) via WiFi and via Hardline. my 1 win7 desktop has no issues and when I put the win10 devices on a different network (my hotspot) the VPN goes through with no issues. any ideas?

I've already tried disabling the win10 stations local firewall and that did not help.
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6 Comments
I am sysadmin..I want to know

I want to reach the server, to check the connectivity thru specific port.
This is just to varify whether the required firewall rule defined properly or not.
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27 Comments
Consider the below scenario

userPC---- firewall --- Destination-server
                         10.1.1.1


I have installed some software on the server, the service  of that software is using port # 301.

1) Scenario...
      Firewall defined
      server#  service UP
        userPC# telnet 10.1.1.1 301  --> user get reply

2)Scenario...
      Firewall defined
      server# service DOWN

is there any command/3rdparty-tools available to just varify, pockets from userPC able to reach on the server through port#301

==
This I asked just to segregate if there any issue, problem from firewall side (or) destination server side.
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6 Comments
Why Diversity in Tech Matters
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Why Diversity in Tech Matters

Kesha Williams, certified professional and software developer, explores the imbalance of diversity in the world of technology -- especially when it comes to hiring women. She showcases ways she's making a difference through the Colors of STEM program.

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Milestone XProtect Management software.  How can I setup SNMP to monitor cameras and alert me when a camera is off line.
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0 Comments
Hi ..CCan anyone tell me what is this service "icl-twobase1" running on port 25000 ?
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2 Comments
I am trying to run an inventory on our servers. All I get in return are DCOM errors in event logs. I speculate the firewalls are blocking traffic but I cannot see anything helpful in Wireshark. I thought that telnet over 135 would fail but does not. Also ICMP is not blocked or I would not be able to ping the servers

Event Viewer
DCOM was unable to communicate with the computer XXXXXX using any of the configured protocols; requested by PID     2780 (C:\Windows\SysWOW64\cscript.EXE), while activating CLSID {8BC3F05E-D86B-11D0-A075-00C04FB68820}.


I have attached the Wireshark capture
pac.pcapng
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3 Comments
I'd like to redistribute eigrp into bgp on the Nexus 7009. I'd also like to set the correct metric. From my understanding, I have to use route map. I did some research and could not find any good info. Any helps will be greatly appreciated.
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5 Comments
Using Linux ES 6  Unable to get SSHD to stay started.      Using        service sshd start     or   restart   starts it but it goes right back to being stopped.

any thoughts?
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9 Comments
Hi... Can anyone tell me what is this Simple Network Audio Protocol running on port 4752 ? Thanks
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1 Comment

Networking Protocols

11K

Solutions

18

Content

i
The collection of articles, videos, and posts on this topic.

16K

Contributors

Networking software modules are interfaced with a framework implemented on the machine's operating system that implements the networking functionality of the operating system. The best known frameworks are the TCP/IP model and the OSI model. Systems typically do not use a single protocol to handle a transmission. Instead they use a set of cooperating protocols, sometimes called a protocol family or protocol suite.[9] Some of the best known protocol suites include: IPX/SPX, X.25, AX.25, AppleTalk and TCP/IP. Other protocols indirectly related to networking include the hypertext transfer protocol (HTTP) and its related technologies, Dynamic Host Configuration Protocol (DHCP), Domain Name Server (DNS) and other Internet protocols.