Best Rated threads in Ethernet LANshow all threads

Subject Author Posted Replies
 
looking for pointers to chapter and verse on TEST frames
I'm mucking about with TEST frames - specifically the Linux implementation of the HP-UX linkloop command (and the linkloop_reply code of the Linux implementation, since Linux's networking does not...
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Used cisco PVDM voice modules in stock,for sale!
I have following used original cisco swithes for sale: PVDM-256K-4 PVDM-256K-8 PVDM2-8 PVDM2-16 PVDM2-32 PVDM2-48 PVDM2-64 PVDM2-24DM PVDM3-16 PVDM3-32 PVDM3-64 PVDM3-128 PVDM3-256 Please contact me...
 
10HD vs. 100FD
Hello, 1) suppose two ports with the settings from the subject line attempt to communicate. I can't find in the 802.3 standard description of the exact behavior in such situation (obviously...
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STP - bridge ID
Hello I'm reading the STP defined by 802.1d and can't understand one thing. All bridges are is uniquely identified by 64-bit long IDs, that in fact is a concatenation of a globally-unique 48-bit...
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MTU for cable modem connection to shaw.ca
The interface to my cable modem connection to here on Pender Island has MTU = 576 whereas I would have expected to find MTU = 1500. joule:/home/peter# ifconfig eth0 eth0 Link encap:Ethernet HWaddr...
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How to test Ring such as EAPS or RSTP recovery time?
Does anyone know how to test Ring or RSTP recovery time? Any tools I can use? Extreme networks declare the EAPS recovery time is 50ms. Thanks alot, st without more information on exactly what you want...
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Utilities to Test Gigabit Ethernet
We are putting in gigabit ethernet. In trying to test the speed of the links in individual rooms, it quickly became apparent that we are bottlenecked on things like the speed of the hard drive that...
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Linksys SRW224P switch? Fan Noise?
Anyone else have one of the above switches? Very nice feature set, but the fans are driving me out of the room. Anyone know how to disassemble it? I gotta do something about those fans... Thanks! Do...
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Flow control frames: will I see them with tcpdump?
Greetings, I'm troubleshooting an application problem in which I think that Ethernet flow control may be a contributing factor. I think my switch may be sending PAUSE messages to particularly...
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Can we daisy-chain computers together in Ethernet?
Let's say we have four computers that we want to network together. Of course, we can get a four-port hub and run an Ethernet cable from each individual computer to the hub. I wonder, though, if it's...
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difference between Repeater,hub,bridge, switch,router, gateway
Hi all as far as i understand the difference between Repeater,hub,bridge, switch,router, gateway are as follows , how correct is my understanding ? Repeater Forwards every frame it receives it is a...
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Ethernet packet size and QinQ standard?
A normative question: AS we all know, ethernet has a max packet size of 1514 bytes: 14 bytes header (dst + src + len/type), plus 1500 bytes data. For 802.1Q tagging, the spec was changed to allow a...
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Ethernet switch flooding packets?
Hi All, I did a WireShark packet trace this evening on the network. I was surprised to see quite a few packets that weren't meant for me. Naturally I saw packets from my PC to the network, some...
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100BASE-TX Scrambler Problem
For 100BASE-TX, the scrambler is defined with 18 lines of Verilog code. One could use some different circuit as long as it acts exactly the same as this. That code I include below. If you will refer...
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rack switch ports on back
I am looking for a gigabit ethernet switch for a rack mount unit. For some reason most of the rack mount switches I see have the ethernet connections on the front. Not sure why that is as how many...
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Does wireshark have the ability to edit and send packet?? Any other software have???
Hi~ Does wireshark or ethereal have the ability to edit and send packet???? I tried to do this,but it seems not have this function. I found a software "Packetyzer" can do this,but it have something...
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Soft Ethernet BER Tester Tool
I am seeking a means of performing basic 10/100 bit error rate testing using a Win XP laptop w/ integrated NIC. Essentially I am looking for a software application to run on the laptiop that can...
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How does Allied Telesis CentreCOM TM AT-210T and AT-210TS Micro Transceiver work
I recently bought a big box of surplus computer parts at our universities surplus auction for $10.00. It consisted mostly of sound cards and video cards, a couple of external modems, mice,keyboards,...
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How to open the hood on this D-Link Ethernet switch?
Dear everyone, apologies for a question that's more hardware-related than networking related... I have a D-Link DGS-1216T Ethernet switch, in a 19"/1U chassis - and I'd like to remove the lid off that...
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MII preamble size
IEEE 802.3 clause 22 talks about the Media Independent Interface (MII). 22.2.3 says, "Data frames transmitted through the MII shall have the frame format shown in Figure 22-10." Figure 22-10 looks a...
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