Is it feasible to have a global communication network without the transport layer?
Well this is the question .Thanks
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| March 2, 2012 12:25 AM
OSI, TCP, UDP
Well this is the question .Thanks
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| March 2, 2012 12:25 AM
OSI, TCP, UDP
iSeries NFS: Change from UDP to TCP
We are running on V5R4 and attempting to mount (via NFS) an external file system (Data Domain 530) onto the iSeries. Even though on the surface it appears that the mount was successful; you cannot execute any type of read or write operation to the mount. After running a communications trace, it was determined that [...]
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| March 19, 2012 10:14 PM
iseries v5r4, NFS, TCP, UDP
We are running on V5R4 and attempting to mount (via NFS) an external file system (Data Domain 530) onto the iSeries. Even though on the surface it appears that the mount was successful; you cannot execute any type of read or write operation to the mount. After running a communications trace, it was determined that [...]
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| March 19, 2012 10:14 PM
iseries v5r4, NFS, TCP, UDP
Some email stuck in Exchange 2003 queue
Hi All, We have a single Exchange 2003 Enterprise server with about 150 users. Lately – over the last month some emails have begun to languish in the queue until delivery failure. Other emails from the same senders to the same recipients go through, and internal emails are sent as well. During troubleshooting, I was [...]
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| June 2, 2011 2:29 PM
Exchange, Exchange 2003, Exchange Enterprise Edition, Exchange errors, TCP, TCP RST
Hi All, We have a single Exchange 2003 Enterprise server with about 150 users. Lately – over the last month some emails have begun to languish in the queue until delivery failure. Other emails from the same senders to the same recipients go through, and internal emails are sent as well. During troubleshooting, I was [...]
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| June 2, 2011 2:29 PM
Exchange, Exchange 2003, Exchange Enterprise Edition, Exchange errors, TCP, TCP RST
TCP/IP MTU and MSS
In my LAN, the MTU is 1500, and hosts A and b have an MSS of 1460. By testing and analysing with Fireshark I sent a 4000-byte long TCP segment from host A to host B in my LAN, but the segment came in full (the 4k bytes came in one piece). Shouldn’t the 4k [...]
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| March 19, 2011 11:29 PM
TCP, TCP IP, TCP IP MSS MTU Segment
In my LAN, the MTU is 1500, and hosts A and b have an MSS of 1460. By testing and analysing with Fireshark I sent a 4000-byte long TCP segment from host A to host B in my LAN, but the segment came in full (the 4k bytes came in one piece). Shouldn’t the 4k [...]
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| March 19, 2011 11:29 PM
TCP, TCP IP, TCP IP MSS MTU Segment
How to send packets in peer-to-peer networking
hello.. i’m still new in IT field.. i want to ask some question about networking.. how do i want to send tcp and udp packet in peer to peer network environment which is without any server in my topology. i don’t know what software should i use. after send both packet, i have to capture [...]
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| February 19, 2011 11:18 AM
Advanced Peer-to-Peer Networking, Packets, Peer-to-Peer, TCP, UDP
hello.. i’m still new in IT field.. i want to ask some question about networking.. how do i want to send tcp and udp packet in peer to peer network environment which is without any server in my topology. i don’t know what software should i use. after send both packet, i have to capture [...]
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| February 19, 2011 11:18 AM
Advanced Peer-to-Peer Networking, Packets, Peer-to-Peer, TCP, UDP
Encrypt TCP messages
What is the best way to encrypt proprietary (non-XML) messages over a TCP socket from the iSeries? I am currently using IBM’s QZRDSSRV API’s to do the sends and receives and create the socket connections, but those API’s don’t support encryption.
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| January 19, 2011 1:32 PM
AS400 iseries, Encryption, IBM, Socket, TCP
What is the best way to encrypt proprietary (non-XML) messages over a TCP socket from the iSeries? I am currently using IBM’s QZRDSSRV API’s to do the sends and receives and create the socket connections, but those API’s don’t support encryption.
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| January 19, 2011 1:32 PM
AS400 iseries, Encryption, IBM, Socket, TCP
Checking TCP Servers
I need to code a program that will confirm that certain TCP Servers such as TFTP are NOT started per PCI requirements as they are insecure
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| January 7, 2011 4:18 PM
PCI, TCP, TFTP, TFTP Server
I need to code a program that will confirm that certain TCP Servers such as TFTP are NOT started per PCI requirements as they are insecure
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| January 7, 2011 4:18 PM
PCI, TCP, TFTP, TFTP Server
High latency, TCP window size, single or multi session
Dear Gurus : the situation is between 2 place with high latency e.g. 60ms from China to Taiwan. the IPLC link is 20mbps , the test PC hase been tcp optimisation increase window size FYI http://www.speedguide.net/downloads.php if one ftp test session still can not reach for example 10%(vs 100Mbps LAN) , 10Mbps, the provider say [...]
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| November 5, 2010 3:40 PM
Filezilla, Networking, TCP, Telecom
Dear Gurus : the situation is between 2 place with high latency e.g. 60ms from China to Taiwan. the IPLC link is 20mbps , the test PC hase been tcp optimisation increase window size FYI http://www.speedguide.net/downloads.php if one ftp test session still can not reach for example 10%(vs 100Mbps LAN) , 10Mbps, the provider say [...]
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| November 5, 2010 3:40 PM
Filezilla, Networking, TCP, Telecom
Limit Port 80 Time_Wait from my computer to router
How can I limit the number of requests my computer makes to my router to port 80. At idle, when looking at the connection page of my router I see a hundred or so port 80 Time_Wait from my computer address (say 192.168.1.145) to my routers address (say 192.168.1.1).This has just started probably from some [...]
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| February 22, 2011 4:33 PM
Port 80, Routers, TCP, TCP Listening Port, TCP Ports
How can I limit the number of requests my computer makes to my router to port 80. At idle, when looking at the connection page of my router I see a hundred or so port 80 Time_Wait from my computer address (say 192.168.1.145) to my routers address (say 192.168.1.1).This has just started probably from some [...]
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| February 22, 2011 4:33 PM
Port 80, Routers, TCP, TCP Listening Port, TCP Ports
Layer 2 Ethernet throughput
We have 2 sites. Point A and point B. Point A has a 100M ethernet line on a 100M port and point B has a logically 20M line seating on a 100M port. Telco providers use traffic shaping to logically set the bandwidth on their L2 device at their nearest office from point B. We have multiple [...]
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| August 24, 2010 6:01 AM
Cisco, Cisco 2800, Cisco 2800 configuration, Cisco 2980, Ethernet, TCP, Throughput, Wireless in 2010
We have 2 sites. Point A and point B. Point A has a 100M ethernet line on a 100M port and point B has a logically 20M line seating on a 100M port. Telco providers use traffic shaping to logically set the bandwidth on their L2 device at their nearest office from point B. We have multiple [...]
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| August 24, 2010 6:01 AM
Cisco, Cisco 2800, Cisco 2800 configuration, Cisco 2980, Ethernet, TCP, Throughput, Wireless in 2010
What protocol is more suitable for chatting program
Which protocol is more suitable for writing a chatting program, either TCP or UDP?
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| August 4, 2010 12:13 PM
TCP, Transmission Control Protocol, UDP, User Datagram Protocol
Which protocol is more suitable for writing a chatting program, either TCP or UDP?
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| August 4, 2010 12:13 PM
TCP, Transmission Control Protocol, UDP, User Datagram Protocol
What is a Reason for Outgoing TCP Connections to Port 25 (SMTP) From Random TCP Ports on a PC with no Email Client Running?
What is a Reson for Outgoing Tcp Connections to Port 25 (SMTP) From Random Tcp Ports on a Pc with no Emamil Client Running? The IP addresses that it was trying to reach resolved to yahoo and aol webmail mx servers. I am trying to track down a spam virus in a network, is this [...]
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| June 22, 2010 8:48 PM
SMTP, SMTP Errors, TCP
What is a Reson for Outgoing Tcp Connections to Port 25 (SMTP) From Random Tcp Ports on a Pc with no Emamil Client Running? The IP addresses that it was trying to reach resolved to yahoo and aol webmail mx servers. I am trying to track down a spam virus in a network, is this [...]
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| June 22, 2010 8:48 PM
SMTP, SMTP Errors, TCP
Role of Session Layer in OSI Model
Hi, I am facing problems in what does session layer do.. exactly. i know that session layer is used with TCP communication only. So Session layer is the one that controls its establishment, continuation and termination of sessions by rasing flags : FIN, RST etc.. please explain………………….
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| June 7, 2010 8:56 AM
OSI Model, TCP, Windows Server 2003
Hi, I am facing problems in what does session layer do.. exactly. i know that session layer is used with TCP communication only. So Session layer is the one that controls its establishment, continuation and termination of sessions by rasing flags : FIN, RST etc.. please explain………………….
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| June 7, 2010 8:56 AM
OSI Model, TCP, Windows Server 2003
What indicates high thresholds in TCP statistics, especially Failed Connection Attempts?
I am trying to learn about TCP statistics, especially Failed Connection Attempts. What value would indicate a high threshold? Also, what causes these errors to occur? Does this indicate an issue at the remote or local host? Or does it have to do with network bandwidth or lack of I/O, etc.? Thanks!
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| December 11, 2009 2:00 AM
failed connection attempts, Network troubleshooting, Networking, TCP, TCP IP, TCP/IP
I am trying to learn about TCP statistics, especially Failed Connection Attempts. What value would indicate a high threshold? Also, what causes these errors to occur? Does this indicate an issue at the remote or local host? Or does it have to do with network bandwidth or lack of I/O, etc.? Thanks!
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| December 11, 2009 2:00 AM
failed connection attempts, Network troubleshooting, Networking, TCP, TCP IP, TCP/IP
TCP Fast Retransmission
From what I have read TCP Fast Retransmission is meant to occur if 3 or more duplicate ACKs are recieved in a row. However I have a trace file where Fast retransmission is occuring after only 2 duplicate ACKs. Can anyone explain this for me please? Why is there a variation in the number of [...]
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| December 4, 2009 3:22 PM
ACK, Duplicate ACKs, TCP, TCP Fast Retransmission
From what I have read TCP Fast Retransmission is meant to occur if 3 or more duplicate ACKs are recieved in a row. However I have a trace file where Fast retransmission is occuring after only 2 duplicate ACKs. Can anyone explain this for me please? Why is there a variation in the number of [...]
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| December 4, 2009 3:22 PM
ACK, Duplicate ACKs, TCP, TCP Fast Retransmission
What is the difference between TCP and OSI?
What is the difference between TCP (Transmission Control Protocol) and OSI (Open Systems Interconnection)?
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| October 20, 2009 2:30 PM
Networking, OSI, TCP
What is the difference between TCP (Transmission Control Protocol) and OSI (Open Systems Interconnection)?
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| October 20, 2009 2:30 PM
Networking, OSI, TCP
Packet Sniffer
I need to know about packet sniffer with a clear demo and how the packets are transmitted in TCP and UDP.
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| October 20, 2009 1:46 PM
Packet sniffers, TCP, UDP
I need to know about packet sniffer with a clear demo and how the packets are transmitted in TCP and UDP.
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| October 20, 2009 1:46 PM
Packet sniffers, TCP, UDP
netstat -s for TCP Statistics for IPv4?
Hello All, i trying to figure out TCP Statistics for IPv4 especially Failed Connection Attempts . I would like to understand what value would indicate high as threshold?. Also i would like to know if appearing of errors of such kind indicate issue at remote host or local, and what could cause such errors ,network [...]
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| October 25, 2009 8:51 AM
IPv4, Netstat, Network protocols, TCP
Hello All, i trying to figure out TCP Statistics for IPv4 especially Failed Connection Attempts . I would like to understand what value would indicate high as threshold?. Also i would like to know if appearing of errors of such kind indicate issue at remote host or local, and what could cause such errors ,network [...]
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| October 25, 2009 8:51 AM
IPv4, Netstat, Network protocols, TCP
TCP Listening Port
How do I get my TCP listening port in an enterprise network using Windows Server 2003
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| May 19, 2009 6:49 PM
Port, TCP, TCP Listening Port, Windows Server 2003
How do I get my TCP listening port in an enterprise network using Windows Server 2003
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| May 19, 2009 6:49 PM
Port, TCP, TCP Listening Port, Windows Server 2003
tcp/ip and ipx/spx
how tcp/ip and ipx/spx communicate effectively as 1 network
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| May 27, 2009 4:06 PM
IP, IPX, Novell IPX/SPX, TCP
how tcp/ip and ipx/spx communicate effectively as 1 network
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| May 27, 2009 4:06 PM
IP, IPX, Novell IPX/SPX, TCP
