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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Michelle Phillips
Sometimes clients can lose connectivity with the Lotus Notes Domino Server, but there's not always an obvious answer as to why it happens. Read this article to follow one of the first experiences I had with Lotus Notes on a client's machine, my now good bipolar friendly software.
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Simple, centralized multimedia control
Simple, centralized multimedia control

Watch and learn to see how ATEN provided an easy and effective way for three jointly-owned pubs to control the 60 televisions located across their three venues utilizing the ATEN Control System, Modular Matrix Switch and HDBaseT extenders.

Configuring network clients can be a chore, especially if there are a large number of them or a lot of itinerant users.  DHCP dynamically manages this process, much to the relief of users and administrators alike!
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by:Jim Horn
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Nice work.  Voted Yes.
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Mikrotik OSPF Network
Creating an OSPF network that automatically (dynamically) reroutes network traffic over other connections to prevent network downtime.
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Network ports are the threads that hold network communication together. They are an essential part of networking that can be easily ignore or misunderstood, my goals is to show those who don't have a strong network foundation how network ports operate.
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by:jorge diaz
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Thanks for pointing it out Gauthier.

Thanks for the comment Jim.
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by:Naif Almarzuqi
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Excellent article, easy to understand
Thanks Alot
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The Maximum Segment size (MSS) is an important consideration when troubleshooting connectivity via the Internet/Intranet. As the packets are routed via the Internet/Intranet, the packets must traverse through multiple routers in the path between two hosts. In a perfect world, each TCP segment can pass through every router without being fragmented. If the segment size is too large for any of the routers through which the data traverses, the segments that are too large must be fragmented. For most End-Users, the MSS is set automatically by the operating system, but as you will see in the article, a router/firewall can modify the packet and change the MSS. The MSS is easily calculated from just a few known variables; you can use this information to predict what data packets would look like once they were captured from such as TCPDUMP or Wireshark.

A few weeks ago I encountered a very interesting issue while capturing data with tcpdump in my lab for a research project that I was working; the affects of IPv4 packet exchange between two hosts.  What I observed was the MSS  in the original packet that was transmitted from host A to host B was being modified; I expected the MSS of the initial SYN packet from host A to be 1460 and the SYN ACK packet from Host B to be 1460. This however, was not the case as I had observed the MSS on the initial SYN packet from Host A as 1350 when sending a packet to Host B utilizing TCP on port 80:

1. Host A SYN bit sent with MSS of 1460
2. SYN …
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by:Soulja
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Great article RFC!
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TCP/IP

11K

Solutions

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.